pike.git/lib/modules/Sql.pmod/pgsql.pike:80592552c0f4901fa0b669fd5173c5c63588e457

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1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 /* * This is the PostgreSQL direct network module for Pike. */ //! This is an interface to the PostgreSQL database //! server. This module is independent of any external libraries. //! Note that you @b{do not@} need to have a //! PostgreSQL server running on your host to use this module: you can //! connect to the database over a TCP/IP socket. //! //! This module replaces the functionality of the older @[Sql.postgres] //! and @[Postgres.postgres] modules. //! //! This module supports the following features: //! @ul //! @item //! PostgreSQL network protocol version 3, authentication methods //! currently supported are: cleartext and MD5 (recommended). //! @item //! Streaming queries which do not buffer the whole resultset in memory. //! @item //! Automatic binary transfers to and from the database for most common //! datatypes (amongst others: integer, text and bytea types). //! @item //! Automatic character set conversion and native wide string support. //! Supports UTF8/Unicode for multibyte characters, and all single-byte //! character sets supported by the database. //! @item //! SQL-injection protection by allowing just one statement per query //! and ignoring anything after the first (unquoted) semicolon in the query. //! @item //! COPY support for streaming up- and download. //! @item //! Accurate error messages. //! @item //! Automatic precompilation of complex queries (session cache). //! @item //! Multiple simultaneous queries on the same database connection. //! @item //! Cancelling of long running queries by force or by timeout. //! @item //! Event driven NOTIFY. //! @item //! SSL encrypted connections (optional or forced). //! @endul //! Check the PostgreSQL documentation for further details. //! //! @note //! Multiple simultaneous queries on the same database connection is a //! feature that none of the other database drivers for Pike support. //! So, although it's efficient, its use will make switching database drivers //! difficult. //! //! @seealso //! @[Sql.Sql], @[Sql.postgres], @url{http://www.postgresql.org/docs/@} #pike __REAL_VERSION__ #require constant(Thread.Thread) #include "pgsql.h" #define ERROR(X ...) predef::error(X) final int _fetchlimit=FETCHLIMIT; final Thread.Mutex _unnamedportalmux; private Thread.Mutex unnamedstatement; final int _portalsinflight; private .pgsql_util.conxion c; private string cancelsecret; private int backendpid, backendstatus; final mapping(string:mixed) _options; private array(string) lastmessage=({}); private int clearmessage; private mapping(string:array(mixed)) notifylist=([]); final mapping(string:string) _runtimeparameter; final mapping(string:mapping(string:mixed)) _prepareds=([]); private int pstmtcount; private int ptstmtcount; // Periodically one would like to reset this // but checking when this is safe to do // probably is more costly than the gain final int _pportalcount; private int totalhits; private int cachedepth=STATEMENTCACHEDEPTH; private int timeout=QUERYTIMEOUT; private int portalbuffersize=PORTALBUFFERSIZE; private int reconnected; // Number of times the connection was reset private int reconnectdelay; // Time to next reconnect #ifdef PG_STATS private int skippeddescribe; // Number of times we skipped Describe phase private int portalsopened; // Number of portals opened private int prepstmtused; // Number of times we used prepared statements #endif final int _msgsreceived; // Number of protocol messages received final int _bytesreceived; // Number of bytes received private int warningsdropcount; // Number of uncollected warnings private int warningscollected; private int invalidatecache; private Thread.Queue qportals; final mixed _delayederror; private function (:void) readyforquery_cb; final string _host; final int _port; private string database, user, pass; private Thread.Condition waitforauthready; final Thread.Mutex _shortmux; final Thread.Condition _readyforcommit; final int _waittocommit, _readyforquerycount; private string _sprintf(int type, void|mapping flags) { string res=UNDEFINED; switch(type) { case 'O': res=sprintf(DRIVERNAME"(%s@%s:%d/%s,%d,%d)", user,_host,_port,database,c&&c->socket?->query_fd(),backendpid); break; } return res; } //! With no arguments, this function initialises (reinitialises if a //! connection has been set up previously) a connection to the //! PostgreSQL backend. Since PostgreSQL requires a database to be //! selected, it will try to connect to the default database. The //! connection may fail however, for a variety of reasons; in this case //! the most likely reason is because you don't have sufficient privileges //! to connect to that database. So use of this particular syntax is //! discouraged. //! //! @param host //! Should either contain @expr{"hostname"@} or //! @expr{"hostname:portname"@}. This allows you to specify the TCP/IP //! port to connect to. If the parameter is @expr{0@} or @expr{""@}, //! it will try to connect to localhost, default port. //! //! @param database //! Specifies the database to connect to. Not specifying this is //! only supported if the PostgreSQL backend has a default database //! configured. If you do not want to connect to any live database, //! you can use @expr{"template1"@}. //! //! @param options //! Currently supports at least the following: //! @mapping //! @member int "reconnect" //! Set it to zero to disable automatic reconnects upon losing //! the connection to the database. Not setting it, or setting //! it to one, will cause one timed reconnect to take place. //! Setting it to -1 will cause the system to try and reconnect //! indefinitely. //! @member int "use_ssl" //! If the database supports and allows SSL connections, the session //! will be SSL encrypted, if not, the connection will fallback //! to plain unencrypted. //! @member int "force_ssl" //! If the database supports and allows SSL connections, the session //! will be SSL encrypted, if not, the connection will abort. //! @member int "text_query" //! Send queries to and retrieve results from the database using text //! instead of the, generally more efficient, default native binary method. //! Turning this on will allow multiple statements per query separated //! by semicolons. //! @member int "sync_parse" //! Set it to zero to turn synchronous parsing off for statements. //! Setting this to off can cause surprises because statements could //! be parsed before the previous statements have been executed //! (e.g. references to temporary tables created in the preceding //! statement), //! but it can speed up parsing due to increased parallelism. //! @member int "cache_autoprepared_statements" //! If set to zero, it disables the automatic statement prepare and //! cache logic; caching prepared statements can be problematic //! when stored procedures and tables are redefined which leave stale //! references in the already cached prepared statements. //! @member string "client_encoding" //! Character encoding for the client side, it defaults to using //! the default encoding specified by the database, e.g. //! @expr{"UTF8"@} or @expr{"SQL_ASCII"@}. //! @member string "standard_conforming_strings" //! When on, backslashes in strings must not be escaped any longer, //! @[quote()] automatically adjusts quoting strategy accordingly. //! @member string "escape_string_warning" //! When on, a warning is issued if a backslash (\) appears in an //! ordinary string literal and @expr{"standard_conforming_strings"@} //! is off, defaults to on. //! @endmapping //! For the numerous other options please check the PostgreSQL manual. //! //! @note //! You need to have a database selected before using the sql-object, //! otherwise you'll get exceptions when you try to query it. Also //! notice that this function @b{can@} raise exceptions if the db //! server doesn't respond, if the database doesn't exist or is not //! accessible to you. //! //! @seealso //! @[Postgres.postgres], @[Sql.Sql], @[select_db()], //! @url{http://www.postgresql.org/search/?u=%2Fdocs%2Fcurrent%2F&q=client+connection+search_path@} protected void create(void|string host, void|string database, void|string user, void|string pass, void|mapping(string:mixed) options) { this::pass = pass; if(pass) { String.secure(pass); pass = "CENSORED"; } this::user = user; this::database = database; _options = options || ([]); if(!host) host = PGSQL_DEFAULT_HOST; if(has_value(host,":") && sscanf(host,"%s:%d",host,_port)!=2) ERROR("Error in parsing the hostname argument\n"); this::_host = host; if(!_port) _port = PGSQL_DEFAULT_PORT; .pgsql_util.register_backend(); _shortmux=Thread.Mutex(); reconnect(); } //! @returns //! The textual description of the last //! server-related error. Returns @expr{0@} if no error has occurred //! yet. It is not cleared upon reading (can be invoked multiple //! times, will return the same result until a new error occurs). //! //! During the execution of a statement, this function accumulates all //! non-error messages (notices, warnings, etc.). If a statement does not //! generate any errors, this function will return all collected messages //! since the last statement. //! //! @note //! The string returned is not newline-terminated. //! //! @param clear //! To clear the error, set it to @expr{1@}. //! //! @seealso //! @[big_query()] /*semi*/final string error(void|int clear) { throwdelayederror(this); string s=lastmessage*"\n"; if(clear) lastmessage=({}); warningscollected=0; return sizeof(s) && s; } //! This function returns a string describing what host are we talking to, //! and how (TCP/IP or UNIX sockets). //! //! @seealso //! @[server_info()] /*semi*/final string host_info() { return sprintf("fd:%d TCP/IP %s:%d PID %d", c?c->socket->query_fd():-1,_host,_port,backendpid); } //! Returns true if the connection seems to be open. //! //! @note //! This function only checks that there's an open connection, //! and that the other end hasn't closed it yet. No data is //! sent over the connection. //! //! For a more reliable check of whether the connection //! is alive, please use @[ping()]. //! //! @seealso //! @[ping()] /*semi*/final int is_open() { catch { return c->socket->is_open(); }; return 0; } //! Check whether the connection is alive. //! //! @returns //! Returns one of the following: //! @int //! @value 0 //! Everything ok. //! @value 1 //! The connection has reconnected automatically. //! @value -1 //! The server has gone away, and the connection is dead. //! @endint //! //! @seealso //! @[is_open()] /*semi*/final int ping() { return is_open() && !catch(c->start()->sendcmd(FLUSHSEND)) ? !!reconnected : -1; } private .pgsql_util.conxion getsocket(void|int nossl) { return .pgsql_util.conxion(this,qportals,(int)nossl); } //! Cancels all currently running queries in this session. //! //! @seealso //! @[reload()], @[resync()] //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final void cancelquery() { PD("CancelRequest\n"); .pgsql_util.conxion lcon=getsocket(1); lcon->add_int32(16)->add_int32(PG_PROTOCOL(1234,5678)) ->add_int32(backendpid)->add(cancelsecret)->sendcmd(FLUSHSEND); lcon->close(); #ifdef PG_DEBUGMORE PD("Closetrace %O\n",backtrace()); #endif if(c) { .pgsql_util.conxion plugbuffer=c->start(1); foreach(qportals->peek_array();;int|.pgsql_util.sql_result portal) if(objectp(portal)) portal->_closeportal(plugbuffer); plugbuffer->sendcmd(SENDOUT); } } //! Changes the connection charset. When set to @expr{"UTF8"@}, the query, //! parameters and results can be Pike-native wide strings. //! //! @param charset //! A PostgreSQL charset name. //! //! @seealso //! @[get_charset()], @[create()], //! @url{http://www.postgresql.org/search/?u=%2Fdocs%2Fcurrent%2F&q=character+sets@} /*semi*/final void set_charset(string charset) { if(charset) big_query(sprintf("SET CLIENT_ENCODING TO '%s'",quote(charset))); } //! @returns //! The PostgreSQL name for the current connection charset. //! //! @seealso //! @[set_charset()], @[getruntimeparameters()], //! @url{http://www.postgresql.org/search/?u=%2Fdocs%2Fcurrent%2F&q=character+sets@} /*semi*/final string get_charset() { waitauthready(); return _runtimeparameter[CLIENT_ENCODING]; } //! @returns //! Currently active runtimeparameters for //! the open session; these are initialised by the @tt{options@} parameter //! during session creation, and then processed and returned by the server. //! Common values are: //! @mapping //! @member string "client_encoding" //! Character encoding for the client side, e.g. //! @expr{"UTF8"@} or @expr{"SQL_ASCII"@}. //! @member string "server_encoding" //! Character encoding for the server side as determined when the //! database was created, e.g. @expr{"UTF8"@} or @expr{"SQL_ASCII"@}. //! @member string "DateStyle" //! Date parsing/display, e.g. @expr{"ISO, DMY"@}. //! @member string "TimeZone" //! Default timezone used by the database, e.g. @expr{"localtime"@}. //! @member string "standard_conforming_strings" //! When on, backslashes in strings must not be escaped any longer. //! @member string "session_authorization" //! Displays the authorisationrole which the current session runs under. //! @member string "is_superuser" //! Indicates if the current authorisationrole has database-superuser //! privileges. //! @member string "integer_datetimes" //! Reports wether the database supports 64-bit-integer dates and times. //! @member string "server_version" //! Shows the server version, e.g. @expr{"8.3.3"@}. //! @endmapping //! //! The values can be changed during a session using SET commands to the //! database. //! For other runtimeparameters check the PostgreSQL documentation. //! //! @seealso //! @url{http://www.postgresql.org/search/?u=%2Fdocs%2Fcurrent%2F&q=client+connection+search_path@} //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final mapping(string:string) getruntimeparameters() { waitauthready(); return _runtimeparameter+([]); } //! @returns //! A set of statistics for the current session: //! @mapping //! @member int "warnings_dropped" //! Number of warnings/notices generated by the database but not //! collected by the application by using @[error()] after the statements //! that generated them. //! @member int "skipped_describe_count" //! Number of times the driver skipped asking the database to //! describe the statement parameters because it was already cached. //! Only available if PG_STATS is compile-time enabled. //! @member int "used_prepared_statements" //! Numer of times prepared statements were used from cache instead of //! reparsing in the current session. //! Only available if PG_STATS is compile-time enabled. //! @member int "current_prepared_statements" //! Cache size of currently prepared statements. //! @member int "current_prepared_statement_hits" //! Sum of the number hits on statements in the current statement cache. //! @member int "prepared_statement_count" //! Total number of prepared statements generated. //! @member int "portals_opened_count" //! Total number of portals opened, i.e. number of statements issued //! to the database. //! Only available if PG_STATS is compile-time enabled. //! @member int "bytes_received" //! Total number of bytes received from the database so far. //! @member int "messages_received" //! Total number of messages received from the database (one SQL-statement //! requires multiple messages to be exchanged). //! @member int "reconnect_count" //! Number of times the connection to the database has been lost. //! @member int "portals_in_flight" //! Currently still open portals, i.e. running statements. //! @endmapping //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final mapping(string:mixed) getstatistics() { mapping(string:mixed) stats=([ "warnings_dropped":warningsdropcount, "current_prepared_statements":sizeof(_prepareds), "current_prepared_statement_hits":totalhits, "prepared_statement_count":pstmtcount, #ifdef PG_STATS "used_prepared_statements":prepstmtused, "skipped_describe_count":skippeddescribe, "portals_opened_count":portalsopened, #endif "messages_received":_msgsreceived, "bytes_received":_bytesreceived, "reconnect_count":reconnected, "portals_in_flight":_portalsinflight, ]); return stats; } //! @param newdepth //! Sets the new cachedepth for automatic caching of prepared statements. //! //! @returns //! The previous cachedepth. //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final int setcachedepth(void|int newdepth) { int olddepth=cachedepth; if(!undefinedp(newdepth) && newdepth>=0) cachedepth=newdepth; return olddepth; } //! @param newtimeout //! Sets the new timeout for long running queries. //! //! @returns //! The previous timeout. //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final int settimeout(void|int newtimeout) { int oldtimeout=timeout; if(!undefinedp(newtimeout) && newtimeout>0) { timeout=newtimeout; if(c) c->timeout=timeout; } return oldtimeout; } //! @param newportalbuffersize //! Sets the new portalbuffersize for buffering partially concurrent queries. //! //! @returns //! The previous portalbuffersize. //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final int setportalbuffersize(void|int newportalbuffersize) { int oldportalbuffersize=portalbuffersize; if(!undefinedp(newportalbuffersize) && newportalbuffersize>0) portalbuffersize=newportalbuffersize; return oldportalbuffersize; } //! @param newfetchlimit //! Sets the new fetchlimit to interleave queries. //! //! @returns //! The previous fetchlimit. //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final int setfetchlimit(void|int newfetchlimit) { int oldfetchlimit=_fetchlimit; if(!undefinedp(newfetchlimit) && newfetchlimit>=0) _fetchlimit=newfetchlimit; return oldfetchlimit; } private string glob2reg(string glob) { if(!glob||!sizeof(glob)) return "%"; return replace(glob,({"*","?","\\","%","_"}),({"%","_","\\\\","\\%","\\_"})); } private string a2nls(array(string) msg) { return msg*"\n"+"\n"; } private string pinpointerror(void|string query,void|string offset) { if(!query) return ""; int k=(int)offset; if(k<=0) return MARKSTART+query+MARKEND; return MARKSTART+(k>1?query[..k-2]:"")+MARKERROR+query[k-1..]+MARKEND; } private void connect_cb() { PD("%O\n",_runtimeparameter); } private void reconnect_cb() { lastmessage+=({sprintf("Reconnected to database %s",host_info())}); runcallback(backendpid,"_reconnect",""); } private array(string) showbindings(.pgsql_util.sql_result portal) { array(string) msgs=({}); array from; if(portal && (from = portal._params)) { array to,paramValues; [from,to,paramValues] = from; if(sizeof(paramValues)) { string val; int i; string fmt=sprintf("%%%ds %%3s %%.61s",max(@map(from,sizeof))); foreach(paramValues;i;val) msgs+=({sprintf(fmt,from[i],to[i],sprintf("%O",val))}); } } return msgs; } private void preplastmessage(mapping(string:string) msgresponse) { lastmessage=({ sprintf("%s %s:%s %s\n (%s:%s:%s)", msgresponse.S,msgresponse.C,msgresponse.P||"", msgresponse.M,msgresponse.F||"",msgresponse.R||"", msgresponse.L||"")}); } private void waitauthready() { if(waitforauthready) { PD("%d Wait for auth ready %O\n",c&&c->socket?->query_fd(),backtrace()[-2]); Thread.MutexKey lock=_shortmux->lock(); catch(waitforauthready->wait(lock)); lock=0; PD("%d Wait for auth ready released.\n",c&&c->socket?->query_fd()); } } private inline mixed callout(function(mixed ...:void) f, float|int delay,mixed ... args) { return .pgsql_util.local_backend->call_out(f,delay,@args); } final void _processloop(.pgsql_util.conxion ci) { int terminating=0; .pgsql_util.conxiin cr=ci->i; int|.pgsql_util.sql_result portal; mixed err; { Stdio.Buffer plugbuffer=Stdio.Buffer()->add_int32(PG_PROTOCOL(3,0)); if(user) plugbuffer->add("user\0")->add(user)->add_int8(0); if(database) plugbuffer->add("database\0")->add(database)->add_int8(0); _options.reconnect=undefinedp(_options.reconnect) || _options.reconnect; foreach(_options-.pgsql_util.censoroptions; string name; mixed value) plugbuffer->add(name)->add_int8(0)->add((string)value)->add_int8(0); plugbuffer->add_int8(0); PD("%O\n",(string)plugbuffer); if(catch(ci->start()->add_hstring(plugbuffer,4,4)->sendcmd(SENDOUT))) { #ifdef PG_DEBUG if(!_options) PD("_options is zero, %O\n",this); #endif if(_options && _options.reconnect) // FIXME why can _options be 0? _connectfail(); else destruct(waitforauthready); return; } } // Do not flush at this point, PostgreSQL 9.4 disapproves cancelsecret=0; #ifdef PG_DEBUG PD("Processloop\n"); string datarowdebug; int datarowdebugcount; void showportal(int msgtype) { if(objectp(portal)) PD("%d<%O %d %c switch portal\n", ci->socket->query_fd(),portal._portalname,++ci->queueinidx,msgtype); else if(portal>0) PD("%d<Sync %d %d %c portal\n", ci->socket->query_fd(),++ci->queueinidx,portal,msgtype); }; #endif for(;;) { err=catch { #ifdef PG_DEBUG if(!portal && datarowdebug) { PD("%s rows %d\n",datarowdebug,datarowdebugcount); datarowdebug=0; datarowdebugcount=0; } #endif int msgtype=cr->read_int8(); if(!portal) { portal=qportals->try_read(); #ifdef PG_DEBUG showportal(msgtype); #endif } int msglen=cr->read_int32(); _msgsreceived++; _bytesreceived+=1+msglen; int errtype=NOERROR; PD("%d<",ci->socket->query_fd()); switch(msgtype) { array getcols() { int bintext=cr->read_int8(); int cols=cr->read_int16(); #ifdef PG_DEBUG array a; msglen-=4+1+2+2*cols; foreach(a=allocate(cols,([]));;mapping m) m.type=cr->read_int16(); #else cr->consume(cols<<1); #endif // Discard column info, and make it line oriented return ({ ({(["name":"line"])}), ({bintext?BYTEAOID:TEXTOID}) }); }; array(string) reads() { #ifdef PG_DEBUG if(msglen<1) errtype=PROTOCOLERROR; #endif array ret=({}),aw=({0}); do { string w=cr->read_cstring(); msglen-=sizeof(w)+1; aw[0]=w; ret+=aw; } while(msglen); return ret; }; mapping(string:string) getresponse() { mapping(string:string) msgresponse=([]); msglen-=4; foreach(reads();;string f) if(sizeof(f)) msgresponse[f[..0]]=f[1..]; PD("%O\n",msgresponse); return msgresponse; }; case 'R': { PD("Authentication "); string sendpass; msglen-=4+4; int authtype=cr->read_int32(); switch(authtype) { case 0: PD("Ok\n"); .pgsql_util.local_backend->remove_call_out(reconnect); cr->gottimeout=cancelquery; cr->timeout=timeout; reconnectdelay=0; cancelsecret=""; break; case 2: PD("KerberosV5\n"); errtype=PROTOCOLUNSUPPORTED; break; case 3: PD("ClearTextPassword\n"); sendpass=pass; break; case 4: PD("CryptPassword\n"); errtype=PROTOCOLUNSUPPORTED; break; case 5: PD("MD5Password\n"); #ifdef PG_DEBUG if(msglen<4) errtype=PROTOCOLERROR; #endif #define md5hex(x) String.string2hex(Crypto.MD5.hash(x)) sendpass=md5hex(pass+user); sendpass="md5"+md5hex(sendpass+cr->read(msglen)); #ifdef PG_DEBUG msglen=0; #endif break; case 6: PD("SCMCredential\n"); errtype=PROTOCOLUNSUPPORTED; break; case 7: PD("GSS\n"); errtype=PROTOCOLUNSUPPORTED; break; case 9: PD("SSPI\n"); errtype=PROTOCOLUNSUPPORTED; break; case 8: PD("GSSContinue\n"); errtype=PROTOCOLUNSUPPORTED; cancelsecret=cr->read(msglen); // Actually SSauthdata #ifdef PG_DEBUG if(msglen<1) errtype=PROTOCOLERROR; msglen=0; #endif break; default: PD("Unknown Authentication Method %c\n",authtype); errtype=PROTOCOLUNSUPPORTED; break; } switch(errtype) { case NOERROR: if(cancelsecret!="") ci->start()->add_int8('p')->add_hstring(sendpass,4,5) ->add_int8(0)->sendcmd(SENDOUT); break; // No flushing here, PostgreSQL 9.4 disapproves default: case PROTOCOLUNSUPPORTED: ERROR("Unsupported authenticationmethod %c\n",authtype); break; } break; } case 'K': msglen-=4+4;backendpid=cr->read_int32(); cancelsecret=cr->read(msglen); #ifdef PG_DEBUG PD("BackendKeyData %O\n",cancelsecret); msglen=0; #endif break; case 'S': { PD("ParameterStatus "); msglen-=4; array(string) ts=reads(); #ifdef PG_DEBUG if(sizeof(ts)==2) { #endif _runtimeparameter[ts[0]]=ts[1]; #ifdef PG_DEBUG PD("%O=%O\n",ts[0],ts[1]); } else errtype=PROTOCOLERROR; #endif break; } case '3': #ifdef PG_DEBUG PD("CloseComplete\n"); msglen-=4; #endif break; case 'Z': backendstatus=cr->read_int8(); #ifdef PG_DEBUG msglen-=4+1; PD("ReadyForQuery %c\n",backendstatus); #endif for(;objectp(portal);portal=qportals->read()) { #ifdef PG_DEBUG showportal(msgtype); #endif portal->_purgeportal(); } foreach(qportals->peek_array();;.pgsql_util.sql_result qp) { if(objectp(qp) && qp._synctransact && qp._synctransact<=portal) { PD("Checking portal %O %d<=%d\n", qp._portalname,qp._synctransact,portal); qp->_purgeportal(); } } portal=0; _readyforquerycount--; if(readyforquery_cb) readyforquery_cb(),readyforquery_cb=0; destruct(waitforauthready); break; case '1': #ifdef PG_DEBUG PD("ParseComplete\n"); msglen-=4; #endif break; case 't': { array a; #ifdef PG_DEBUG int cols=cr->read_int16(); PD("%O ParameterDescription %d values\n",portal._query,cols); msglen-=4+2+4*cols; a=cr->read_ints(cols,4); #else a=cr->read_ints(cr->read_int16(),4); #endif #ifdef PG_DEBUGMORE PD("%O\n",a); #endif if(portal._tprepared) portal._tprepared.datatypeoid=a; Thread.Thread(portal->_preparebind,a); break; } case 'T': { array a,at; int cols=cr->read_int16(); #ifdef PG_DEBUG PD("RowDescription %d columns %O\n",cols,portal._query); msglen-=4+2; #endif at=allocate(cols); foreach(a=allocate(cols);int i;) { string s=cr->read_cstring(); mapping(string:mixed) res=(["name":s]); #ifdef PG_DEBUG msglen-=sizeof(s)+1+4+2+4+2+4+2; res.tableoid=cr->read_int32()||UNDEFINED; res.tablecolattr=cr->read_int16()||UNDEFINED; #else cr->consume(6); #endif at[i]=cr->read_int32(); #ifdef PG_DEBUG { int len=cr->read_sint(2); res.length=len>=0?len:"variable"; } res.atttypmod=cr->read_int32(); /* formatcode contains just a zero when Bind has not been issued * yet, but the content is irrelevant because it's determined * at query time */ res.formatcode=cr->read_int16(); #else cr->consume(8); #endif a[i]=res; } #ifdef PG_DEBUGMORE PD("%O\n",a); #endif if(portal._forcetext) portal->_setrowdesc(a,at); // Do not consume queued portal else { portal->_processrowdesc(a,at); portal=0; } break; } case 'n': { #ifdef PG_DEBUG msglen-=4; PD("NoData %O\n",portal._query); #endif portal._fetchlimit=0; // disables subsequent Executes portal ->_processrowdesc(.pgsql_util.emptyarray,.pgsql_util.emptyarray); portal=0; break; } case 'H': portal->_processrowdesc(@getcols()); PD("CopyOutResponse %O\n",portal._query); break; case '2': { mapping tp; #ifdef PG_DEBUG msglen-=4; PD("%O BindComplete\n",portal._portalname); #endif if(tp=portal._tprepared) { int tend=gethrtime(); int tstart=tp.trun; if(tend==tstart) m_delete(_prepareds,portal._query); else { tp.hits++; totalhits++; if(!tp.preparedname) { if(sizeof(portal._preparedname)) tp.preparedname=portal._preparedname; tstart=tend-tstart; if(!tp.tparse || tp.tparse>tstart) tp.tparse=tstart; } tp.trunstart=tend; } } break; } case 'D': msglen-=4; #ifdef PG_DEBUG #ifdef PG_DEBUGMORE PD("%O DataRow %d bytes\n",portal._portalname,msglen); #endif datarowdebugcount++; if(!datarowdebug) datarowdebug=sprintf( "%O DataRow %d bytes",portal._portalname,msglen); #endif #ifdef PG_DEBUG msglen= #endif portal->_decodedata(msglen,_runtimeparameter[CLIENT_ENCODING]); break; case 's': #ifdef PG_DEBUG PD("%O PortalSuspended\n",portal._portalname); msglen-=4; #endif portal=0; break; case 'C': { msglen-=4; #ifdef PG_DEBUG if(msglen<1) errtype=PROTOCOLERROR; #endif string s=cr->read(msglen-1); portal->_storetiming(); PD("%O CommandComplete %O\n",portal._portalname,s); #ifdef PG_DEBUG if(cr->read_int8()) errtype=PROTOCOLERROR; msglen=0; #else cr->consume(1); #endif portal->_releasesession(s); portal=0; break; } case 'I': #ifdef PG_DEBUG PD("EmptyQueryResponse %O\n",portal._portalname); msglen-=4; #endif portal->_releasesession(); portal=0; break; case 'd': PD("%O CopyData\n",portal._portalname); portal->_storetiming(); msglen-=4; #ifdef PG_DEBUG if(msglen<0) errtype=PROTOCOLERROR; #endif portal->_processdataready(({cr->read(msglen)}),msglen); #ifdef PG_DEBUG msglen=0; #endif break; case 'G': portal->_setrowdesc(@getcols()); PD("%O CopyInResponse\n",portal._portalname); portal._state=COPYINPROGRESS; break; case 'c': #ifdef PG_DEBUG PD("%O CopyDone\n",portal._portalname); msglen-=4; #endif portal=0; break; case 'E': { if(!_readyforquerycount) sendsync(); PD("%O ErrorResponse %O\n", objectp(portal)&&(portal._portalname||portal._preparedname), objectp(portal)&&portal._query); mapping(string:string) msgresponse; msgresponse=getresponse(); warningsdropcount+=warningscollected; warningscollected=0; switch(msgresponse.C) { case "P0001": lastmessage=({sprintf("%s: %s",msgresponse.S,msgresponse.M)}); USERERROR(a2nls(lastmessage +({pinpointerror(portal._query,msgresponse.P)}) +showbindings(portal))); case "53000":case "53100":case "53200":case "53300":case "53400": case "57P01":case "57P02":case "57P03":case "57P04":case "3D000": preplastmessage(msgresponse); PD(a2nls(lastmessage));throw(0); case "08P01":case "42P05": errtype=PROTOCOLERROR; case "XX000":case "42883":case "42P01": invalidatecache=1; default: preplastmessage(msgresponse); if(msgresponse.D) lastmessage+=({msgresponse.D}); if(msgresponse.H) lastmessage+=({msgresponse.H}); lastmessage+=({ pinpointerror(objectp(portal)&&portal._query,msgresponse.P)+ pinpointerror(msgresponse.q,msgresponse.p)}); if(msgresponse.W) lastmessage+=({msgresponse.W}); if(objectp(portal)) lastmessage+=showbindings(portal); switch(msgresponse.S) { case "PANIC":werror(a2nls(lastmessage)); } USERERROR(a2nls(lastmessage)); } if(objectp(portal)) portal->_releasesession(); break; } case 'N': { PD("NoticeResponse\n"); mapping(string:string) msgresponse; msgresponse=getresponse(); if(clearmessage) { warningsdropcount+=warningscollected; clearmessage=warningscollected=0; lastmessage=({}); } warningscollected++; lastmessage=({sprintf("%s %s: %s", msgresponse.S,msgresponse.C,msgresponse.M)}); break; } case 'A': { PD("NotificationResponse\n"); msglen-=4+4; int pid=cr->read_int32(); string condition,extrainfo=UNDEFINED; { array(string) ts=reads(); switch(sizeof(ts)) { #if PG_DEBUG case 0: errtype=PROTOCOLERROR; break; default: errtype=PROTOCOLERROR; #endif case 2: extrainfo=ts[1]; case 1: condition=ts[0]; } } PD("%d %s\n%s\n",pid,condition,extrainfo); runcallback(pid,condition,extrainfo); break; } default: if(msgtype!=-1) { string s; PD("Unknown message received %c\n",msgtype); s=cr->read(msglen-=4);PD("%O\n",s); #ifdef PG_DEBUG msglen=0; #endif errtype=PROTOCOLUNSUPPORTED; } else { lastmessage+=({ sprintf("Connection lost to database %s@%s:%d/%s %d\n", user,_host,_port,database,backendpid)}); if(!waitforauthready) throw(0); USERERROR(a2nls(lastmessage)); } break; } #ifdef PG_DEBUG if(msglen) errtype=PROTOCOLERROR; #endif { string msg; switch(errtype) { case PROTOCOLUNSUPPORTED: msg=sprintf("Unsupported servermessage received %c\n",msgtype); break; case PROTOCOLERROR: msg=sprintf("Protocol error with database %s",host_info()); break; case NOERROR: continue; // Normal production loop } ERROR(a2nls(lastmessage+=({msg}))); } }; // We only get here if there is an error if(err==MAGICTERMINATE) { // Announce connection termination to server ci->start()->add("X\0\0\0\4")->sendcmd(SENDOUT); terminating=1; if(!sizeof(ci)) break; } if(stringp(err)) { .pgsql_util.sql_result or; if(!objectp(or=portal)) or=this; if(!or._delayederror) or._delayederror=err; if(objectp(portal)) portal->_releasesession(); portal=0; if(!waitforauthready) continue; // Only continue if authentication did not fail } break; } PD("Closing database processloop %O\n",err); _delayederror=err; for(;objectp(portal);portal=qportals->read()) if(objectp(portal)) { #ifdef PG_DEBUG showportal(0); #endif portal->_purgeportal(); } if(!ci->close() && !terminating && _options.reconnect) _connectfail(); else destruct(waitforauthready); if(err && !stringp(err)) throw(err); } //! Closes the connection to the database, any running queries are //! terminated instantly. //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final void close() { catch(cancelquery()); catch(c->sendterminate()); c=0; destruct(waitforauthready); } protected void destroy() { catch(close()); .pgsql_util.unregister_backend(); } final void _connectfail(void|mixed err) { PD("Connect failed %O reconnectdelay %d\n",err,reconnectdelay); destruct(waitforauthready); if(!err || reconnectdelay) { int tdelay; switch(tdelay=reconnectdelay) { case 0: reconnectdelay=RECONNECTDELAY; break; default: if(err) _delayederror=err; if(_options.reconnect!=-1) return; reconnectdelay=RECONNECTBACKOFF; break; } Thread.MutexKey lock=_shortmux->lock(); if(!waitforauthready) waitforauthready=Thread.Condition(); lock=0; PD("Schedule reconnect in %ds\n",tdelay); _delayederror=0; callout(reconnect,tdelay,1); } else if(err) _delayederror=err; } private int reconnect(void|int force) { PD("(Re)connect\n"); if(!force) { Thread.MutexKey lock=_shortmux->lock(); if(waitforauthready) { lock=0; return 0; // Connect still in progress in other thread } waitforauthready=Thread.Condition(); lock=0; } if(c) { PD("Close old connection\n"); reconnected++; #ifdef PG_STATS prepstmtused=0; #endif if(!force) c->sendterminate(); else c->close(); c=0; PD("Flushing old cache\n"); foreach(_prepareds;;mapping tp) m_delete(tp,"preparedname"); if(!_options.reconnect) return 0; } PD("Actually start to connect\n"); qportals=Thread.Queue(); _readyforcommit=Thread.Condition(); _readyforquerycount=1; _waittocommit=0; qportals->write(1); if(!(c=getsocket())) { string msg=sprintf("Couldn't connect to database on %s:%d",_host,_port); if(force) { if(!sizeof(lastmessage) || lastmessage[sizeof(lastmessage)-1]!=msg) lastmessage+=({msg}); return 0; } else ERROR(msg+"\n"); } _runtimeparameter=([]); _unnamedportalmux=Thread.Mutex(); unnamedstatement=Thread.Mutex(); readyforquery_cb=force?reconnect_cb:connect_cb; _portalsinflight=0; return 1; } //! For PostgreSQL this function performs the same function as @[resync()]. //! //! @seealso //! @[resync()], @[cancelquery()] /*semi*/final void reload() { resync(); } private void reset_dbsession() { big_query("ROLLBACK"); big_query("RESET ALL"); big_query("CLOSE ALL"); big_query("DISCARD TEMP"); } private void resync_cb() { switch(backendstatus) { case 'T':case 'E': foreach(_prepareds;;mapping tp) { m_delete(tp,"datatypeoid"); m_delete(tp,"datarowdesc"); m_delete(tp,"datarowtypes"); } Thread.Thread(reset_dbsession); // Urgently and deadlockfree } } private void sendsync() { _readyforquerycount++; c->start()->sendcmd(SYNCSEND); } //! Resyncs the database session; typically used to make sure the session is //! not still in a dangling transaction. //! //! If called while the connection is in idle state, the function is //! lightweight and briefly touches base with the database server to //! make sure client and server are in sync. //! //! If issued while inside a transaction, it will rollback the transaction, //! close all open cursors, drop all temporary tables and reset all //! session variables to their default values. //! //! @seealso //! @[cancelquery()], @[reload()] //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final void resync() { mixed err; if(is_open()) { err = catch { PD("Portalsinflight: %d\n",_portalsinflight); if(!waitforauthready) { readyforquery_cb=resync_cb; sendsync(); } return; }; PD("%O\n",err); } if(!reconnect()&&sizeof(lastmessage)) ERROR(a2nls(lastmessage)); } //! This function allows you to connect to a database. Due to //! restrictions of the Postgres frontend-backend protocol, you always //! have to be connected to a database, so in fact this function just //! allows you to connect to a different database on the same server. //! //! @note //! This function @b{can@} raise exceptions if something goes wrong //! (backend process not running, insufficient privileges...) //! //! @seealso //! @[create()] /*semi*/final void select_db(string dbname) { database=dbname; reconnect(); reconnected=0; } //! With PostgreSQL you can LISTEN to NOTIFY events. //! This function allows you to detect and handle such events. //! //! @param condition //! Name of the notification event we're listening //! to. A special case is the empty string, which matches all events, //! and can be used as fallback function which is called only when the //! specific condition is not handled. Another special case is //! @expr{"_reconnect"@} which gets called whenever the connection //! unexpectedly drops and reconnects to the database. //! //! @param notify_cb //! Function to be called on receiving a notification-event of //! condition @ref{condition@}. //! The callback function is invoked with //! @expr{void notify_cb(pid,condition,extrainfo, .. args);@} //! @tt{pid@} is the process id of the database session that originated //! the event. @tt{condition@} contains the current condition. //! @tt{extrainfo@} contains optional extra information specified by //! the database. //! The rest of the arguments to @ref{notify_cb@} are passed //! verbatim from @ref{args@}. //! The callback function must return no value. //! //! @param selfnotify //! Normally notify events generated by your own session are ignored. //! If you want to receive those as well, set @ref{selfnotify@} to one. //! //! @param args //! Extra arguments to pass to @ref{notify_cb@}. //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final void set_notify_callback(string condition, void|function(int,string,string,mixed ...:void) notify_cb,void|int selfnotify, mixed ... args) { if(!notify_cb) m_delete(notifylist,condition); else { array old=notifylist[condition]; if(!old) old=({notify_cb}); if(selfnotify||args) old+=({selfnotify}); if(args) old+=args; notifylist[condition]=old; } } private void runcallback(int pid,string condition,string extrainfo) { array cb; if((cb=notifylist[condition]||notifylist[""]) && (pid!=backendpid || sizeof(cb)>1 && cb[1])) callout(cb[0],0,pid,condition,extrainfo,@cb[2..]); } //! @returns //! The given string, but escapes/quotes all contained magic characters //! according to the quoting rules of the current session for non-binary //! arguments in textual SQL-queries. //! //! @note //! Quoting must not be done for parameters passed in bindings. //! //! @seealso //! @[big_query()], @[quotebinary()], @[create()] /*semi*/final string quote(string s) { waitauthready(); string r=_runtimeparameter.standard_conforming_strings; if(r && r=="on") return replace(s, "'", "''"); return replace(s, ({ "'", "\\" }), ({ "''", "\\\\" }) ); } //! @returns //! The given string, but escapes/quotes all contained magic characters //! for binary (bytea) arguments in textual SQL-queries. //! //! @note //! Quoting must not be done for parameters passed in bindings. //! //! @seealso //! @[big_query()], @[quote()] //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. /*semi*/final string quotebinary(string s) { return replace(s, ({ "'", "\\", "\0" }), ({ "''", "\\\\", "\\000" }) ); } //! This function creates a new database (assuming we //! have sufficient privileges to do this). //! //! @param db //! Name of the new database. //! //! @seealso //! @[drop_db()] /*semi*/final void create_db(string db) { big_query(sprintf("CREATE DATABASE %s",db)); } //! This function destroys a database and all the data it contains (assuming //! we have sufficient privileges to do so). It is not possible to delete //! the database you're currently connected to. You can connect to database //! @expr{"template1"@} to avoid connecting to any live database. //! //! @param db //! Name of the database to be deleted. //! //! @seealso //! @[create_db()] /*semi*/final void drop_db(string db) { big_query(sprintf("DROP DATABASE %s",db)); } //! @returns //! A string describing the server we are //! talking to. It has the form @expr{"servername/serverversion"@} //! (like the HTTP protocol description) and is most useful in //! conjunction with the generic SQL-server module. //! //! @seealso //! @[host_info()] /*semi*/final string server_info () { waitauthready(); return DRIVERNAME"/"+(_runtimeparameter.server_version||"unknown"); } //! @returns //! An array of the databases available on the server. //! //! @param glob //! If specified, list only those databases matching it. /*semi*/final array(string) list_dbs (void|string glob) { array row,ret=({}); .pgsql_util.sql_result res=big_query("SELECT d.datname " "FROM pg_database d " "WHERE d.datname ILIKE :glob " "ORDER BY d.datname", ([":glob":glob2reg(glob)])); while(row=res->fetch_row()) ret+=({row[0]}); return ret; } //! @returns //! An array containing the names of all the tables and views in the //! path in the currently selected database. //! //! @param glob //! If specified, list only the tables with matching names. /*semi*/final array(string) list_tables (void|string glob) { array row,ret=({}); // This query might not work on PostgreSQL 7.4 .pgsql_util.sql_result res=big_query( // due to missing schemasupport "SELECT CASE WHEN 'public'=n.nspname THEN '' ELSE n.nspname||'.' END " " ||c.relname AS name " "FROM pg_catalog.pg_class c " " LEFT JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace " "WHERE c.relkind IN ('r','v') AND n.nspname<>'pg_catalog' " " AND n.nspname !~ '^pg_toast' AND pg_catalog.pg_table_is_visible(c.oid) " " AND c.relname ILIKE :glob " " ORDER BY 1", ([":glob":glob2reg(glob)])); while(row=res->fetch_row()) ret+=({row[0]}); return ret; } //! @returns //! A mapping, indexed on the column name, of mappings describing //! the attributes of a table of the current database. //! The currently defined fields are: //! //! @mapping //! @member string "schema" //! Schema the table belongs to //! @member string "table" //! Name of the table //! @member string "kind" //! Type of table //! @member string "owner" //! Tableowner //! @member int "rowcount" //! Estimated rowcount of the table //! @member int "datasize" //! Estimated total datasize of the table in bytes //! @member int "indexsize" //! Estimated total indexsize of the table in bytes //! @member string "name" //! Name of the column //! @member string "type" //! A textual description of the internal (to the server) column type-name //! @member int "typeoid" //! The OID of the internal (to the server) column type //! @member string "length" //! Size of the columndatatype //! @member mixed "default" //! Default value for the column //! @member int "is_shared" //! @member int "has_index" //! If the table has any indices //! @member int "has_primarykey" //! If the table has a primary key //! @endmapping //! //! @param glob //! If specified, list only the tables with matching names. //! Setting it to @expr{*@} will include system columns in the list. /*semi*/final array(mapping(string:mixed)) list_fields(void|string table, void|string glob) { array row, ret=({}); string schema=UNDEFINED; sscanf(table||"*", "%s.%s", schema, table); .pgsql_util.sql_result res = big_typed_query( "SELECT a.attname, a.atttypid, t.typname, a.attlen, " " c.relhasindex, c.relhaspkey, CAST(c.reltuples AS BIGINT) AS reltuples, " " (c.relpages " " +COALESCE( " " (SELECT SUM(tst.relpages) " " FROM pg_catalog.pg_class tst " " WHERE tst.relfilenode=c.reltoastrelid) " " ,0) " " )*8192::BIGINT AS datasize, " " (COALESCE( " " (SELECT SUM(pin.relpages) " " FROM pg_catalog.pg_index pi " " JOIN pg_catalog.pg_class pin ON pin.relfilenode=pi.indexrelid " " WHERE pi.indrelid IN (c.relfilenode,c.reltoastrelid)) " " ,0) " " )*8192::BIGINT AS indexsize, " " c.relisshared, t.typdefault, " " n.nspname, c.relname, " " CASE c.relkind " " WHEN 'r' THEN 'table' " " WHEN 'v' THEN 'view' " " WHEN 'i' THEN 'index' " " WHEN 'S' THEN 'sequence' " " WHEN 's' THEN 'special' " " WHEN 't' THEN 'toastable' " // pun intended :-) " WHEN 'c' THEN 'composite' " " ELSE c.relkind::TEXT END AS relkind, " " r.rolname " "FROM pg_catalog.pg_class c " " LEFT JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace " " JOIN pg_catalog.pg_roles r ON r.oid=c.relowner " " JOIN pg_catalog.pg_attribute a ON c.oid=a.attrelid " " JOIN pg_catalog.pg_type t ON a.atttypid=t.oid " "WHERE c.relname ILIKE :table AND " " (n.nspname ILIKE :schema OR " " :schema IS NULL " " AND n.nspname<>'pg_catalog' AND n.nspname !~ '^pg_toast') " " AND a.attname ILIKE :glob " " AND (a.attnum>0 OR '*'=:realglob) " "ORDER BY n.nspname,c.relname,a.attnum,a.attname", ([":schema":glob2reg(schema),":table":glob2reg(table), ":glob":glob2reg(glob),":realglob":glob])); array colnames=res->fetch_fields(); { mapping(string:string) renames=([ "attname":"name", "nspname":"schema", "relname":"table", "rolname":"owner", "typname":"type", "attlen":"length", "typdefault":"default", "relisshared":"is_shared", "atttypid":"typeoid", "relkind":"kind", "relhasindex":"has_index", "relhaspkey":"has_primarykey", "reltuples":"rowcount", ]); foreach(colnames;int i;mapping m) { string nf,field=m.name; if(nf=renames[field]) field=nf; colnames[i]=field; } } #define delifzero(m,field) if(!(m)[field]) m_delete(m,field) while(row=res->fetch_row()) { mapping m=mkmapping(colnames,row); delifzero(m,"is_shared"); delifzero(m,"has_index"); delifzero(m,"has_primarykey"); delifzero(m,"default"); ret+=({m}); } return ret; } private string trbackendst(int c) { switch(c) { case 'I': return "idle"; case 'T': return "intransaction"; case 'E': return "infailedtransaction"; } return ""; } //! @returns //! The current commitstatus of the connection. Returns either one of: //! @string //! @value idle //! @value intransaction //! @value infailedtransaction //! @endstring //! //! @note //! This function is PostgreSQL-specific, and thus it is not available //! through the generic SQL-interface. final string status_commit() { return trbackendst(backendstatus); } private inline void closestatement( .pgsql_util.conxion|.pgsql_util.bufcon plugbuffer,string oldprep) { .pgsql_util.closestatement(plugbuffer,oldprep); } private inline string int2hex(int i) { return String.int2hex(i); } private inline void throwdelayederror(object parent) { .pgsql_util.throwdelayederror(parent); } //! This is the only provided interface which allows you to query the //! database. If you wish to use the simpler @[Sql.Sql()->query()] function, //! you need to use the @[Sql.Sql] generic SQL-object. //! //! Bindings are supported natively straight across the network. //! Special bindings supported are: //! @mapping //! @member int ":_cache" //! Forces caching on or off for the query at hand. //! @member int ":_text" //! Forces text mode in communication with the database for queries on or off //! for the query at hand. Potentially more efficient than the default //! binary method for simple queries with small or no result sets. //! Note that this mode causes all but the first query result of a list //! of semicolon separated statements to be discarded. //! @member int ":_sync" //! Forces synchronous parsing on or off for statements. //! Setting this to off can cause surprises because statements could //! be parsed before the previous statements have been executed //! (e.g. references to temporary tables created in the preceding //! statement), //! but it can speed up parsing due to increased parallelism. //! @endmapping //! //! @note //! The bindings-parameter passed to this function must remain unaltered //! until the parameters have been sent to the database. The driver //! currently does not expose this moment, but to avoid a race condition //! it is sufficient to keep them unaltered until the first resultrow //! has been fetched (or EOF is reached, in case of no resultrows). //! //! @returns //! A @[Sql.pgsql_util.sql_result] object (which conforms to the //! @[Sql.sql_result] standard interface for accessing data). It is //! recommended to use @[Sql.Sql()->query()] for simpler queries (because //! it is easier to handle, but stores all the result in memory), and //! @[Sql.Sql()->big_query()] for queries you expect to return huge amounts of //! data (it's harder to handle, but fetches results on demand). //! //! @note //! This function @b{can@} raise exceptions. //! //! @note //! This function supports multiple simultaneous queries (portals) on a single //! database connection. This is a feature not commonly supported by other //! database backends. //! //! @note //! This function, by default, does not support multiple queries in one //! querystring. //! I.e. it allows for but does not require a trailing semicolon, but it //! simply ignores any commands after the first unquoted semicolon. This can //! be viewed as a limited protection against SQL-injection attacks. //! To make it support multiple queries in one querystring, use the //! @ref{:_text@} option. //! //! @seealso //! @[big_typed_query()], @[Sql.Sql], @[Sql.sql_result], //! @[Sql.Sql()->query()], @[Sql.pgsql_util.sql_result] /*semi*/final .pgsql_util.sql_result big_query(string q, void|mapping(string|int:mixed) bindings, void|int _alltyped) { throwdelayederror(this); string preparedname=""; int forcecache=-1, forcetext=_options.text_query; int syncparse=zero_type(_options.sync_parse)?-1:_options.sync_parse; if(waitforauthready) waitauthready(); string cenc=_runtimeparameter[CLIENT_ENCODING]; switch(cenc) { case UTF8CHARSET: q=string_to_utf8(q); break; default: if(String.width(q)>8) ERROR("Don't know how to convert %O to %s encoding\n",q,cenc); } array(string|int) paramValues; array from; if(bindings) { if(forcetext) q = .sql_util.emulate_bindings(q, bindings, this), paramValues=({}); else { int pi=0,rep=0; paramValues=allocate(sizeof(bindings)); from=allocate(sizeof(bindings)); array(string) to=allocate(sizeof(bindings)); foreach(bindings; mixed name; mixed value) { if(stringp(name)) { // Throws if mapping key is empty string if(name[0]!=':') name=":"+name; if(name[1]=='_') { // Special option parameter switch(name) { case ":_cache": forcecache=(int)value; break; case ":_text": forcetext=(int)value; break; case ":_sync": syncparse=(int)value; break; } continue; } if(!has_value(q,name)) continue; } from[rep]=name; string rval; if(multisetp(value)) // multisets are taken literally rval=indices(value)*","; // and bypass the encoding logic else { paramValues[pi++]=value; rval=sprintf("$%d",pi); } to[rep++]=rval; } if(rep--) q=replace(q,from=from[..rep],to=to[..rep]); paramValues= pi ? paramValues[..pi-1] : ({}); from=({from,to,paramValues}); } } else paramValues=({}); if(String.width(q)>8) ERROR("Wide string literals in %O not supported\n",q); if(has_value(q,"\0")) ERROR("Querystring %O contains invalid literal nul-characters\n",q); mapping(string:mixed) tp; int tstart; if(!forcetext && forcecache==1 || forcecache!=0 && (sizeof(q)>=MINPREPARELENGTH || .pgsql_util.cachealways[q])) { object plugbuffer=c->start(); if(tp=_prepareds[q]) { if(tp.preparedname) { #ifdef PG_STATS prepstmtused++; #endif preparedname=tp.preparedname; } else if((tstart=tp.trun) && tp.tparse*FACTORPLAN>=tstart && (undefinedp(_options.cache_autoprepared_statements) || _options.cache_autoprepared_statements)) preparedname=PREPSTMTPREFIX+int2hex(pstmtcount++); } else { if(totalhits>=cachedepth) foreach(_prepareds;string ind;tp) { int oldhits=tp.hits; totalhits-=oldhits-(tp.hits=oldhits>>1); if(oldhits<=1) { closestatement(plugbuffer,tp.preparedname); m_delete(_prepareds,ind); } } if(forcecache!=1 && .pgsql_util.createprefix->match(q)) { invalidatecache=1; // Flush cache on CREATE pstmtcount=0; // Reset prepared statementnos tp=UNDEFINED; } else _prepareds[q]=tp=([]); } if(invalidatecache) { invalidatecache=0; foreach(_prepareds;;mapping np) { closestatement(plugbuffer,np.preparedname); m_delete(np,"preparedname"); } } if(sizeof(plugbuffer)) { PD("%O\n",(string)plugbuffer); plugbuffer->sendcmd(FLUSHSEND); // close expireds } else plugbuffer->sendcmd(KEEP); // close start() tstart=gethrtime(); } else // sql_result autoassigns to portal tp=UNDEFINED; .pgsql_util.sql_result portal; portal=.pgsql_util.sql_result(this,c,q, portalbuffersize,_alltyped,from,forcetext); portal._tprepared=tp; #ifdef PG_STATS portalsopened++; #endif clearmessage=1; if(forcetext) { // FIXME What happens if portals are still open? portal._unnamedportalkey=_unnamedportalmux->lock(1); portal._portalname=""; portal->_openportal(); _readyforquerycount++; Thread.MutexKey lock=unnamedstatement->lock(1); c->start(1)->add_int8('Q')->add_hstring(q,4,4+1)->add_int8(0) ->sendcmd(FLUSHLOGSEND,portal); lock=0; PD("Simple query: %O\n",q); } else { object plugbuffer; if(!sizeof(preparedname) || !tp || !tp.preparedname) { if(!sizeof(preparedname)) preparedname= (portal._unnamedstatementkey= (syncparse?unnamedstatement->lock:unnamedstatement->trylock)(1)) ? "" : PTSTMTPREFIX+int2hex(ptstmtcount++); else if(syncparse) portal._unnamedstatementkey=unnamedstatement->lock(1); PD("Parse statement %O=%O\n",preparedname,q); plugbuffer=c->start()->add_int8('P') ->add_hstring(({preparedname,0,q,"\0\0\0"}),4,4) #if 0 // Even though the protocol doesn't require the Parse command to be // followed by a flush, it makes a VERY noticeable difference in // performance if it is omitted; seems like a flaw in the PostgreSQL // server v8.3.3 // In v8.4 and later, things speed up slightly when it is omitted. ->add(PGFLUSH) #endif ; } portal._preparedname=preparedname; if(!tp || !tp.datatypeoid) { PD("Describe statement %O\n",preparedname); (plugbuffer||c->start())->add_int8('D') ->add_hstring(({'S',preparedname,0}),4,4)->sendcmd(FLUSHSEND,portal); } else { if(plugbuffer) plugbuffer->sendcmd(KEEP); #ifdef PG_STATS skippeddescribe++; #endif portal->_setrowdesc(tp.datarowdesc,tp.datarowtypes); } if((portal._tprepared=tp) && tp.datatypeoid) { mixed e=catch(portal->_preparebind(tp.datatypeoid)); if(e && !portal._delayederror) throw(e); } } throwdelayederror(portal); return portal; } //! This is an alias for @[big_query()], since @[big_query()] already supports //! streaming of multiple simultaneous queries through the same connection. //! //! @seealso //! @[big_query()], @[big_typed_query()], @[Sql.Sql], @[Sql.sql_result] /*semi*/final .pgsql_util.sql_result streaming_query(string q, void|mapping(string|int:mixed) bindings) { return big_query(q,bindings); } //! This function returns an object that allows streaming and typed //! results. //! //! @seealso //! @[big_query()], @[Sql.Sql], @[Sql.sql_result] /*semi*/final .pgsql_util.sql_result big_typed_query(string q, void|mapping(string|int:mixed) bindings) { return big_query(q,bindings,1); }

pike.git/ lib/ modules/ Sql.pmod/ pgsql.pike > 80592552c0f4901fa0b669fd5173c5c63588e457 [Annotate]