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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:Add experimental tointeger() and todouble() SQL functions.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | toTypeFuncs
Files: files | file ages | folders
SHA1: 465fd853d3e3544cb06b15ffa32ce25774d816c7
User & Date: mistachkin 2013-03-11 01:23:37
Context
2013-03-11
06:24
Add more tests. check-in: f9468e33 user: mistachkin tags: toTypeFuncs
01:23
Add experimental tointeger() and todouble() SQL functions. check-in: 465fd853 user: mistachkin tags: toTypeFuncs
2013-03-09
14:49
Add a test case for the problem fixed by the previous commit. check-in: e899b058 user: dan tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/func.c.

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      assert( sqlite3_value_type(argv[0])==SQLITE_NULL );
      sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
      break;
    }
  }
}











































































































/*
** The unicode() function.  Return the integer unicode code-point value
** for the first character of the input string. 
*/
static void unicodeFunc(
  sqlite3_context *context,
  int argc,
................................................................................
    FUNCTION(sqlite_source_id,   0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
    FUNCTION(sqlite_compileoption_used,1, 0, 0, compileoptionusedFunc  ),
    FUNCTION(sqlite_compileoption_get, 1, 0, 0, compileoptiongetFunc  ),
#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
    FUNCTION(quote,              1, 0, 0, quoteFunc        ),




    FUNCTION(last_insert_rowid,  0, 0, 0, last_insert_rowid),
    FUNCTION(changes,            0, 0, 0, changes          ),
    FUNCTION(total_changes,      0, 0, 0, total_changes    ),
    FUNCTION(replace,            3, 0, 0, replaceFunc      ),
    FUNCTION(zeroblob,           1, 0, 0, zeroblobFunc     ),
  #ifdef SQLITE_SOUNDEX
    FUNCTION(soundex,            1, 0, 0, soundexFunc      ),







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      assert( sqlite3_value_type(argv[0])==SQLITE_NULL );
      sqlite3_result_text(context, "NULL", 4, SQLITE_STATIC);
      break;
    }
  }
}

/*
** EXPERIMENTAL - This is not an official function.  The interface may
** change.  This function may disappear.  Do not write code that depends
** on this function.
**
** Implementation of the TOINTEGER() function.  This function takes a
** single argument.  If the argument is an integer or is a double that
** can be losslessly converted to an integer, the return value is the
** same as the argument.  If the argument is a double that cannot be
** losslessly represented as an integer, the return value is undefined.
** If the argument is NULL, the return value is NULL.  Otherwise, an
** attempt is made to convert the argument to an integer.  If the
** conversion is successful, the integer value is returned; otherwise,
** NULL is returned.
*/
static void tointegerFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  assert( argc==1 );
  UNUSED_PARAMETER(argc);
  switch( sqlite3_value_type(argv[0]) ){
    case SQLITE_FLOAT:
    case SQLITE_INTEGER: {
      sqlite3_result_int64(context, sqlite3_value_int64(argv[0]));
      break;
    }
    case SQLITE_BLOB:
    case SQLITE_TEXT: {
      const unsigned char *zStr = sqlite3_value_text(argv[0]);
      if( zStr ){
        int nStr = sqlite3_value_bytes(argv[0]);
        if( nStr ){
          i64 iVal;
          if( !sqlite3Atoi64(zStr, &iVal, nStr, SQLITE_UTF8) ){
            sqlite3_result_int64(context, iVal);
            return;
          }
        }
      }
      sqlite3_result_null(context);
      break;
    }
    default: {
      assert( sqlite3_value_type(argv[0])==SQLITE_NULL );
      sqlite3_result_null(context);
      break;
    }
  }
}

/*
** EXPERIMENTAL - This is not an official function.  The interface may
** change.  This function may disappear.  Do not write code that depends
** on this function.
**
** Implementation of the TODOUBLE() function.  This function takes a
** single argument.  If the argument is a double or is an integer that
** can be losslessly converted to a double, the return value is the
** same as the argument.  If the argument is an integer that cannot be
** losslessly represented as a double, the return value is undefined.
** If the argument is NULL, the return value is NULL.  Otherwise, an
** attempt is made to convert the argument to a double.  If the
** conversion is successful, the double value is returned; otherwise,
** NULL is returned.
*/
#ifndef SQLITE_OMIT_FLOATING_POINT
static void todoubleFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  assert( argc==1 );
  UNUSED_PARAMETER(argc);
  switch( sqlite3_value_type(argv[0]) ){
    case SQLITE_FLOAT:
    case SQLITE_INTEGER: {
      sqlite3_result_double(context, sqlite3_value_double(argv[0]));
      break;
    }
    case SQLITE_BLOB:
    case SQLITE_TEXT: {
      const unsigned char *zStr = sqlite3_value_text(argv[0]);
      if( zStr ){
        int nStr = sqlite3_value_bytes(argv[0]);
        if( nStr ){
          double rVal;
          if( sqlite3AtoF(zStr, &rVal, nStr, SQLITE_UTF8) ){
            sqlite3_result_double(context, rVal);
            return;
          }
        }
      }
      sqlite3_result_null(context);
      break;
    }
    default: {
      assert( sqlite3_value_type(argv[0])==SQLITE_NULL );
      sqlite3_result_null(context);
      break;
    }
  }
}
#endif

/*
** The unicode() function.  Return the integer unicode code-point value
** for the first character of the input string. 
*/
static void unicodeFunc(
  sqlite3_context *context,
  int argc,
................................................................................
    FUNCTION(sqlite_source_id,   0, 0, 0, sourceidFunc     ),
    FUNCTION(sqlite_log,         2, 0, 0, errlogFunc       ),
#ifndef SQLITE_OMIT_COMPILEOPTION_DIAGS
    FUNCTION(sqlite_compileoption_used,1, 0, 0, compileoptionusedFunc  ),
    FUNCTION(sqlite_compileoption_get, 1, 0, 0, compileoptiongetFunc  ),
#endif /* SQLITE_OMIT_COMPILEOPTION_DIAGS */
    FUNCTION(quote,              1, 0, 0, quoteFunc        ),
    FUNCTION(tointeger,          1, 0, 0, tointegerFunc    ),
#ifndef SQLITE_OMIT_FLOATING_POINT
    FUNCTION(todouble,           1, 0, 0, todoubleFunc     ),
#endif
    FUNCTION(last_insert_rowid,  0, 0, 0, last_insert_rowid),
    FUNCTION(changes,            0, 0, 0, changes          ),
    FUNCTION(total_changes,      0, 0, 0, total_changes    ),
    FUNCTION(replace,            3, 0, 0, replaceFunc      ),
    FUNCTION(zeroblob,           1, 0, 0, zeroblobFunc     ),
  #ifdef SQLITE_SOUNDEX
    FUNCTION(soundex,            1, 0, 0, soundexFunc      ),

Added test/func4.test.





























































































































































































































































































































































































































































































































































































































































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# 2013 March 10
#
# 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 the TOINTEGER() and TODOUBLE()
# functions.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl

set i 0
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(NULL);
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('   ');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('1234');
} {1234}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('   1234');
} {1234}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('bad');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('0xBAD');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('123BAD');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('0x123BAD');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('123NO');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('0x123NO');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('-0x1');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('-0x0');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('0x0');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger('0x1');
} {{}}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-1);
} {-1}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-0);
} {0}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(0);
} {0}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(1);
} {1}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-1.79769313486232e308 - 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-1.79769313486232e308);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-1.79769313486232e308 + 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-9223372036854775808 - 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-9223372036854775808);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-9223372036854775808 + 1);
} {-9223372036854775807}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-2147483648 - 1);
} {-2147483649}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-2147483648);
} {-2147483648}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(-2147483648 + 1);
} {-2147483647}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(2147483647 - 1);
} {2147483646}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(2147483647);
} {2147483647}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(2147483647 + 1);
} {2147483648}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9223372036854775807 - 1);
} {9223372036854775806}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9223372036854775807);
} {9223372036854775807}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9223372036854775807 + 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(1.79769313486232e308 - 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(1.79769313486232e308);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(1.79769313486232e308 + 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(4503599627370496 - 1);
} {4503599627370495}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(4503599627370496);
} {4503599627370496}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(4503599627370496 + 1);
} {4503599627370497}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9007199254740992 - 1);
} {9007199254740991}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9007199254740992);
} {9007199254740992}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9007199254740992 + 1);
} {9007199254740993}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9223372036854775808 - 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9223372036854775808);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(9223372036854775808 + 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(18446744073709551616 - 1);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(18446744073709551616);
} {-9223372036854775808}
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(18446744073709551616 + 1);
} {-9223372036854775808}

ifcapable floatingpoint {
  set i 0
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(NULL);
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('   ');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('1234');
  } {1234.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('   1234');
  } {1234.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('bad');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('0xBAD');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('123BAD');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('0x123BAD');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('123NO');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('0x123NO');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('-0x1');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('-0x0');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('0x0');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble('0x1');
  } {{}}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-1);
  } {-1.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-0);
  } {0.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(0);
  } {0.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(1);
  } {1.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-1.79769313486232e308 - 1);
  } {-Inf}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-1.79769313486232e308);
  } {-Inf}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-1.79769313486232e308 + 1);
  } {-Inf}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-9223372036854775808 - 1);
  } {-9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-9223372036854775808);
  } {-9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-9223372036854775808 + 1);
  } {-9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-2147483648 - 1);
  } {-2147483649.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-2147483648);
  } {-2147483648.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(-2147483648 + 1);
  } {-2147483647.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(2147483647 - 1);
  } {2147483646.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(2147483647);
  } {2147483647.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(2147483647 + 1);
  } {2147483648.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9223372036854775807 - 1);
  } {9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9223372036854775807);
  } {9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9223372036854775807 + 1);
  } {9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(1.79769313486232e308 - 1);
  } {Inf}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(1.79769313486232e308);
  } {Inf}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(1.79769313486232e308 + 1);
  } {Inf}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(4503599627370496 - 1);
  } {4503599627370500.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(4503599627370496);
  } {4503599627370500.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(4503599627370496 + 1);
  } {4503599627370500.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9007199254740992 - 1);
  } {9007199254740990.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9007199254740992);
  } {9007199254740990.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9007199254740992 + 1);
  } {9007199254740990.0}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9223372036854775808 - 1);
  } {9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9223372036854775808);
  } {9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(9223372036854775808 + 1);
  } {9.22337203685478e+18}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(18446744073709551616 - 1);
  } {1.84467440737096e+19}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(18446744073709551616);
  } {1.84467440737096e+19}
  do_execsql_test func4-2.[incr i] {
    SELECT todouble(18446744073709551616 + 1);
  } {1.84467440737096e+19}
}

finish_test