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/* 
 * $Id: sql_util.pmod,v 1.18 2009/08/26 12:38:55 grubba Exp $ 
 * 
 * Some SQL utility functions. 
 * They are kept here to avoid circular references. 
 * 
 * Henrik Grubbström 1999-07-01 
 */ 
 
#pike __REAL_VERSION__ 
 
//! Some SQL utility functions 
 
//! Quote a string so that it can safely be put in a query. 
//! 
//! @param s 
//!   String to quote. 
string quote(string s) 
{ 
  return replace(s, "\'", "\'\'"); 
} 
 
//! Throw an error in case an unimplemented function is called. 
void fallback() 
{ 
  error( "Function not supported in this database." ); 
} 
 
//! Build a raw SQL query, given the cooked query and the variable bindings 
//! It's meant to be used as an emulation engine for those drivers not 
//! providing such a behaviour directly (i.e. Oracle). 
//! The raw query can contain some variables (identified by prefixing 
//! a colon to a name or a number (i.e. ":var" or  ":2"). They will be 
//! replaced by the corresponding value in the mapping. 
//! 
//! @param query 
//!   The query. 
//! 
//! @param bindings 
//!   Optional mapping containing the variable bindings. Make sure that 
//!   no confusion is possible in the query. If necessary, change the 
//!   variables' names. 
string emulate_bindings(string query, mapping(string|int:mixed)|void bindings, 
                        void|object driver) 
{ 
  array(string)k, v; 
  if (!bindings) 
    return query; 
  function my_quote=(driver&&driver->quote?driver->quote:quote); 
  v=Array.map(values(bindings), 
              lambda(mixed m) { 
                if(multisetp(m)) m = indices(m)[0]; 
                return (stringp(m)? "'"+my_quote(m)+"'" : (string)m); 
              }); 
  // Throws if mapping key is empty string. 
  k=Array.map(indices(bindings),lambda(string s){ 
                                  return ( (stringp(s)&&s[0]==':') ? 
                                           s : ":"+s); 
                                }); 
  return replace(query,k,v); 
} 
 
//! Result object wrapper performing utf8 decoding of all fields. 
class UnicodeWrapper ( 
                      // The wrapped result object. 
                      static object master_result 
                      ) 
{ 
  //! Returns the number of rows in the result. 
  int num_rows() 
  { 
    return master_result->num_rows(); 
  } 
 
  //! Returns the number of fields in the result. 
  int num_fields() 
  { 
    return master_result->num_fields(); 
  } 
 
  //! Returns @expr{1@} if there are no more rows in the result. 
  int(0..1) eof() 
  { 
    return master_result->eof(); 
  } 
 
  //! Cached @[fetch_fields()] result. 
  static array(int|mapping(string:mixed)) field_info; 
 
  //! Returns Information about the fields in the result. 
  //! 
  //! The following fields are converted from UTF8 if present: 
  //! @mapping 
  //!   @member string "name" 
  //!     The name of the field. Always present. 
  //!   @member string "table" 
  //!     The table the field is from. Not present from all databases. 
  //!   @member string "default" 
  //!     The default value for the column. Not available from all databases. 
  //! @endmapping 
  array(int|mapping(string:mixed)) fetch_fields() 
  { 
    if (!field_info) { 
      field_info = master_result->fetch_fields(); 
      foreach(field_info, int|mapping(string:mixed) field) { 
        if (mappingp(field)) { 
          field->name = utf8_to_string(field->name); 
          if (field->table) { 
            field->table = utf8_to_string(field->table); 
          } 
          if (field->default) { 
            field->default = utf8_to_string(field->default); 
          } 
        } 
      } 
    } 
    return field_info; 
  } 
 
  //! Skip ahead the specified number of rows. 
  void seek(int rows) 
  { 
    master_result->seek(rows); 
  } 
 
  //! Fetch the next row from the result. 
  //! 
  //! All strings in the result are decoded from UTF8. 
  int|array(string) fetch_row() 
  { 
    int|array(string) row = master_result->fetch_row(); 
    if (!arrayp(row)) return row; 
    array(int|mapping(string:mixed)) field_info = fetch_fields(); 
    foreach(row; int i; string|int val) { 
      if (stringp(val)) { 
        row[i] = utf8_to_string(val); 
      } 
    } 
    return row; 
  } 
 
  //! JSON is always utf8 default, do nothing. 
  int|string fetch_json_result() 
  { 
    return master_result->fetch_json_result(); 
  } 
} 
 
#if constant (Mysql.mysql.HAVE_MYSQL_FIELD_CHARSETNR) 
 
class MySQLUnicodeWrapper 
//! Result wrapper for MySQL that performs UTF-8 decoding of all 
//! nonbinary fields. Useful if the result charset of the connection 
//! has been set to UTF-8. 
//! 
//! @note 
//! There's normally no need to use this class directly. It's used 
//! automatically when @[Mysql.set_unicode_decode_mode] is activated. 
{ 
  inherit UnicodeWrapper; 
 
  int|array(string) fetch_row() 
  { 
    int|array(string) row = master_result->fetch_row(); 
    if (!arrayp(row)) return row; 
    array(int|mapping(string:mixed)) field_info = fetch_fields(); 
    foreach(row; int i; string|int val) { 
      if (stringp(val) && field_info[i]->charsetnr != 63) { 
        row[i] = utf8_to_string(val); 
      } 
    } 
    return row; 
  } 
} 
 
#else 
 
class MySQLBrokenUnicodeWrapper 
// This one is used to get a buggy unicode support when compiled with 
// an old MySQL client lib that doesn't have the charsetnr property in 
// the field info. It looks at the binary flag instead, which is set 
// for binary fields but might also be set for text fields (e.g. with 
// a definition like "VARCHAR(255) BINARY"). 
// 
// I.e. the effect of using this one is that text fields with the 
// binary flag won't be correctly decoded in unicode decode mode. 
// 
// This has to be enabled either by passing "broken-unicode" as 
// charset to Sql.mysql.create or Sql.mysql.set_charset, by calling 
// Sql.mysql.set_unicode_decode_mode(-1), or by defining the 
// environment variable PIKE_BROKEN_MYSQL_UNICODE_MODE. That will 
// cause this buggy variant to be used if and only if the MySQL client 
// lib doesn't support the charsetnr property. 
{ 
  inherit UnicodeWrapper; 
 
  int|array(string) fetch_row() 
  { 
    int|array(string) row = master_result->fetch_row(); 
    if (!arrayp(row)) return row; 
    array(int|mapping(string:mixed)) field_info = fetch_fields(); 
    foreach(row; int i; string|int val) { 
      if (stringp(val) && field_info[i]->flags && 
          !field_info[i]->flags->binary) { 
        row[i] = utf8_to_string(val); 
      } 
    } 
    return row; 
  } 
} 
 
#endif