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Overview
Comment:Add built-in functions numeric(), text(), and blob() that coerce types. Ticket #1287. (CVS 2524)
Downloads: Tarball | ZIP archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: affb0fa2e8c5ff497838ba3c2994cdb1f6f50c68
User & Date: drh 2005-06-22 10:53:59.000
Context
2005-06-23
03:15
Make sure the String8 opcode always has a non-null P3 argument in the foreign_key_list pragma. Ticket #1297. (CVS 2525) (check-in: bcf62dc7a1 user: drh tags: trunk)
2005-06-22
10:53
Add built-in functions numeric(), text(), and blob() that coerce types. Ticket #1287. (CVS 2524) (check-in: affb0fa2e8 user: drh tags: trunk)
08:48
Allow parameters to be introduced by characters ':', '$' and '#'. This is an experimental change. (CVS 2523) (check-in: f3427a139c user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/func.c.
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** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.98 2005/05/24 12:01:02 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"








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** This file contains the C functions that implement various SQL
** functions of SQLite.  
**
** There is only one exported symbol in this file - the function
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.99 2005/06/22 10:53:59 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
#include <math.h>
#include <stdlib.h>
#include <assert.h>
#include "vdbeInt.h"
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    case SQLITE_INTEGER: z = "integer"; break;
    case SQLITE_TEXT:    z = "text";    break;
    case SQLITE_FLOAT:   z = "real";    break;
    case SQLITE_BLOB:    z = "blob";    break;
  }
  sqlite3_result_text(context, z, -1, SQLITE_STATIC);
}
























































































/*
** Implementation of the length() function
*/
static void lengthFunc(
  sqlite3_context *context,
  int argc,








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    case SQLITE_INTEGER: z = "integer"; break;
    case SQLITE_TEXT:    z = "text";    break;
    case SQLITE_FLOAT:   z = "real";    break;
    case SQLITE_BLOB:    z = "blob";    break;
  }
  sqlite3_result_text(context, z, -1, SQLITE_STATIC);
}

/*
** Convert the argument to a numeric type.
*/
static void numericFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  const char *z = 0;
  switch( sqlite3_value_type(argv[0]) ){
    case SQLITE_NULL: {
      sqlite3_result_int(context, 0);
      break;
    }
    case SQLITE_INTEGER:
    case SQLITE_FLOAT: {
      sqlite3_result_value(context, argv[0]);
      break;
    }
    case SQLITE_TEXT:
    case SQLITE_BLOB: {
      z = sqlite3_value_text(argv[0]);
      while( *z && *z!='.' ){ z++; }
      if( *z ){
        sqlite3_result_double(context, sqlite3_value_double(argv[0]));
      }else{
        sqlite3_result_int64(context, sqlite3_value_int64(argv[0]));
      }
      break;
    }
  }
}

/*
** Convert the argument to TEXT
*/
static void textFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  switch( sqlite3_value_type(argv[0]) ){
    case SQLITE_NULL: {
      sqlite3_result_text(context, "", 0, SQLITE_STATIC);
      break;
    }
    case SQLITE_BLOB:
    case SQLITE_INTEGER:
    case SQLITE_FLOAT: {
      sqlite3_result_text(context, sqlite3_value_text(argv[0]),
          sqlite3_value_bytes(argv[0]), SQLITE_TRANSIENT);
      break;
    }
    case SQLITE_TEXT: {
      sqlite3_result_value(context, argv[0]);
      break;
    }
  }
}

/*
** Convert the argument to TEXT
*/
static void blobFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  switch( sqlite3_value_type(argv[0]) ){
    case SQLITE_NULL: {
      sqlite3_result_blob(context, "", 0, SQLITE_STATIC);
      break;
    }
    case SQLITE_TEXT:
    case SQLITE_INTEGER:
    case SQLITE_FLOAT: {
      sqlite3_result_blob(context, sqlite3_value_text(argv[0]),
          sqlite3_value_bytes(argv[0]), SQLITE_TRANSIENT);
      break;
    }
    case SQLITE_BLOB: {
      sqlite3_result_value(context, argv[0]);
      break;
    }
  }
}

/*
** Implementation of the length() function
*/
static void lengthFunc(
  sqlite3_context *context,
  int argc,
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    { "glob",               2, 0, SQLITE_UTF8,    0, globFunc   },
    { "nullif",             2, 0, SQLITE_UTF8,    1, nullifFunc },
    { "sqlite_version",     0, 0, SQLITE_UTF8,    0, versionFunc},
    { "quote",              1, 0, SQLITE_UTF8,    0, quoteFunc  },
    { "last_insert_rowid",  0, 1, SQLITE_UTF8,    0, last_insert_rowid },
    { "changes",            0, 1, SQLITE_UTF8,    0, changes    },
    { "total_changes",      0, 1, SQLITE_UTF8,    0, total_changes },



#ifdef SQLITE_SOUNDEX
    { "soundex",            1, 0, SQLITE_UTF8, 0, soundexFunc},
#endif
#ifdef SQLITE_TEST
    { "randstr",               2, 0, SQLITE_UTF8, 0, randStr    },
    { "test_destructor",       1, 1, SQLITE_UTF8, 0, test_destructor},
    { "test_destructor_count", 0, 0, SQLITE_UTF8, 0, test_destructor_count},








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    { "glob",               2, 0, SQLITE_UTF8,    0, globFunc   },
    { "nullif",             2, 0, SQLITE_UTF8,    1, nullifFunc },
    { "sqlite_version",     0, 0, SQLITE_UTF8,    0, versionFunc},
    { "quote",              1, 0, SQLITE_UTF8,    0, quoteFunc  },
    { "last_insert_rowid",  0, 1, SQLITE_UTF8,    0, last_insert_rowid },
    { "changes",            0, 1, SQLITE_UTF8,    0, changes    },
    { "total_changes",      0, 1, SQLITE_UTF8,    0, total_changes },
    { "text",               1, 0, SQLITE_UTF8,    0, textFunc      },
    { "numeric",            1, 0, SQLITE_UTF8,    0, numericFunc   },
    { "blob",               1, 0, SQLITE_UTF8,    0, blobFunc      },
#ifdef SQLITE_SOUNDEX
    { "soundex",            1, 0, SQLITE_UTF8, 0, soundexFunc},
#endif
#ifdef SQLITE_TEST
    { "randstr",               2, 0, SQLITE_UTF8, 0, randStr    },
    { "test_destructor",       1, 1, SQLITE_UTF8, 0, test_destructor},
    { "test_destructor_count", 0, 0, SQLITE_UTF8, 0, test_destructor_count},
︙︙
Changes to src/vdbeapi.c.
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*/
void sqlite3_result_blob(
  sqlite3_context *pCtx, 
  const void *z, 
  int n, 
  void (*xDel)(void *)
){
  assert( n>0 );
  sqlite3VdbeMemSetStr(&pCtx->s, z, n, 0, xDel);
}
void sqlite3_result_double(sqlite3_context *pCtx, double rVal){
  sqlite3VdbeMemSetDouble(&pCtx->s, rVal);
}
void sqlite3_result_error(sqlite3_context *pCtx, const char *z, int n){
  pCtx->isError = 1;








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*/
void sqlite3_result_blob(
  sqlite3_context *pCtx, 
  const void *z, 
  int n, 
  void (*xDel)(void *)
){
  assert( n>=0 );
  sqlite3VdbeMemSetStr(&pCtx->s, z, n, 0, xDel);
}
void sqlite3_result_double(sqlite3_context *pCtx, double rVal){
  sqlite3VdbeMemSetDouble(&pCtx->s, rVal);
}
void sqlite3_result_error(sqlite3_context *pCtx, const char *z, int n){
  pCtx->isError = 1;
︙︙
Changes to test/func.test. 
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# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing built-in functions.
#
# $Id: func.test,v 1.34 2005/03/29 03:11:00 danielk1977 Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Create a table to work with.
#
do_test func-0.0 {














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# 2001 September 15
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.  The
# focus of this file is testing built-in functions.
#
# $Id: func.test,v 1.35 2005/06/22 10:53:59 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# Create a table to work with.
#
do_test func-0.0 {
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  sqlite3_step $::STMT
  sqlite3_finalize $::STMT
  execsql {
    SELECT quote(a), quote(b) FROM tbl2;
  }
} {X'616263' NULL}



finish_test








































































































































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  sqlite3_step $::STMT
  sqlite3_finalize $::STMT
  execsql {
    SELECT quote(a), quote(b) FROM tbl2;
  }
} {X'616263' NULL}

# Tests for the blob(), text() and numeric() built-ins
#
do_test func-17.1 {
  execsql {SELECT x'616263'}
} abc
do_test func-17.2 {
  execsql {SELECT typeof(x'616263')}
} blob
do_test func-17.3 {
  execsql {SELECT text(x'616263')}
} abc
do_test func-17.4 {
  execsql {SELECT typeof(text(x'616263'))}
} text
do_test func-17.5 {
  execsql {SELECT numeric(x'616263')}
} 0
do_test func-17.6 {
  execsql {SELECT typeof(numeric(x'616263'))}
} integer
do_test func-17.7 {
  execsql {SELECT blob(x'616263')}
} abc
do_test func-17.8 {
  execsql {SELECT typeof(blob(x'616263'))}
} blob
do_test func-17.11 {
  execsql {SELECT null}
} {{}}
do_test func-17.12 {
  execsql {SELECT typeof(NULL)}
} null
do_test func-17.13 {
  execsql {SELECT text(NULL)}
} {{}}
do_test func-17.14 {
  execsql {SELECT typeof(text(NULL))}
} text
do_test func-17.15 {
  execsql {SELECT numeric(NULL)}
} 0
do_test func-17.16 {
  execsql {SELECT typeof(numeric(NULL))}
} integer
do_test func-17.17 {
  execsql {SELECT blob(NULL)}
} {{}}
do_test func-17.18 {
  execsql {SELECT typeof(blob(NULL))}
} blob
do_test func-17.21 {
  execsql {SELECT 123}
} {123}
do_test func-17.22 {
  execsql {SELECT typeof(123)}
} integer
do_test func-17.23 {
  execsql {SELECT text(123)}
} {123}
do_test func-17.24 {
  execsql {SELECT typeof(text(123))}
} text
do_test func-17.25 {
  execsql {SELECT numeric(123)}
} 123
do_test func-17.26 {
  execsql {SELECT typeof(numeric(123))}
} integer
do_test func-17.27 {
  execsql {SELECT blob(123)}
} {123}
do_test func-17.28 {
  execsql {SELECT typeof(blob(123))}
} blob
do_test func-17.31 {
  execsql {SELECT 123.456}
} {123.456}
do_test func-17.32 {
  execsql {SELECT typeof(123.456)}
} real
do_test func-17.33 {
  execsql {SELECT text(123.456)}
} {123.456}
do_test func-17.34 {
  execsql {SELECT typeof(text(123.456))}
} text
do_test func-17.35 {
  execsql {SELECT numeric(123.456)}
} 123.456
do_test func-17.36 {
  execsql {SELECT typeof(numeric(123.456))}
} real
do_test func-17.37 {
  execsql {SELECT blob(123.456)}
} {123.456}
do_test func-17.38 {
  execsql {SELECT typeof(blob(123.456))}
} blob
do_test func-17.41 {
  execsql {SELECT '123abc'}
} {123abc}
do_test func-17.42 {
  execsql {SELECT typeof('123abc')}
} text
do_test func-17.43 {
  execsql {SELECT text('123abc')}
} {123abc}
do_test func-17.44 {
  execsql {SELECT typeof(text('123abc'))}
} text
do_test func-17.45 {
  execsql {SELECT numeric('123abc')}
} 123
do_test func-17.46 {
  execsql {SELECT typeof(numeric('123abc'))}
} integer
do_test func-17.47 {
  execsql {SELECT blob('123abc')}
} {123abc}
do_test func-17.48 {
  execsql {SELECT typeof(blob('123abc'))}
} blob
do_test func-17.49 {
  execsql {SELECT numeric('123.5abc')}
} 123.5
do_test func-17.49b {
  execsql {SELECT typeof(numeric('123.5abc'))}
} real


finish_test