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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:Rename the experimental todouble() function to toreal(), update comments.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | toTypeFuncs
Files: files | file ages | folders
SHA1: 12c318ef1b674d1ef347458ce149398885f5ba10
User & Date: mistachkin 2013-03-13 06:48:05
Context
2013-03-13
20:52
Merge updates from trunk. check-in: d63fa039 user: mistachkin tags: toTypeFuncs
06:48
Rename the experimental todouble() function to toreal(), update comments. check-in: 12c318ef user: mistachkin tags: toTypeFuncs
2013-03-12
09:07
Increase strictness of the new experimental functions and add more tests. check-in: 05c4463e user: mistachkin tags: toTypeFuncs
Changes
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Changes to src/func.c.

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}

/*
** 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,
................................................................................
}

/*
** 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]) ){
................................................................................
#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







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}

/*
** 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 NULL.
** 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,
................................................................................
}

/*
** 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 toreal() 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 NULL.
** 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 torealFunc(
  sqlite3_context *context,
  int argc,
  sqlite3_value **argv
){
  assert( argc==1 );
  UNUSED_PARAMETER(argc);
  switch( sqlite3_value_type(argv[0]) ){
................................................................................
#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(toreal,             1, 0, 0, torealFunc       ),
#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

Changes to test/func4.test.

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#
#    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] {
................................................................................
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(18446744073709551616 + 1);
} {{}}

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}
}

ifcapable check {
  set i 0
  do_execsql_test func4-3.[incr i] {
    CREATE TABLE t1(
................................................................................
    SELECT x FROM t1 ORDER BY x;
  } {1234 1234}

  ifcapable floatingpoint {
    set i 0
    do_execsql_test func4-4.[incr i] {
      CREATE TABLE t2(
        x REAL CHECK(todouble(x) IS NOT NULL)
      );
    } {}
    do_test func4-4.[incr i] {
      catchsql {
        INSERT INTO t2 (x) VALUES (NULL);
      }
    } {1 {constraint failed}}







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#
#    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 toreal()
# functions.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl

set i 0
do_execsql_test func4-1.[incr i] {
................................................................................
do_execsql_test func4-1.[incr i] {
  SELECT tointeger(18446744073709551616 + 1);
} {{}}

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

ifcapable check {
  set i 0
  do_execsql_test func4-3.[incr i] {
    CREATE TABLE t1(
................................................................................
    SELECT x FROM t1 ORDER BY x;
  } {1234 1234}

  ifcapable floatingpoint {
    set i 0
    do_execsql_test func4-4.[incr i] {
      CREATE TABLE t2(
        x REAL CHECK(toreal(x) IS NOT NULL)
      );
    } {}
    do_test func4-4.[incr i] {
      catchsql {
        INSERT INTO t2 (x) VALUES (NULL);
      }
    } {1 {constraint failed}}