cast.test

sqlite-3.4.1,嵌入式数据库.是一个功能强大的开源数据库,给学习和研发以及小型公司的发展带来了全所未有的好处.

# 2005 June 25
#
# 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 CAST operator.
#
# $Id: cast.test,v 1.7 2007/05/17 16:34:45 danielk1977 Exp $

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

# Only run these tests if the build includes the CAST operator
ifcapable !cast {
  finish_test
  return
}

# Tests for the CAST( AS blob), CAST( AS text) and CAST( AS numeric) built-ins
#
ifcapable bloblit {
  do_test cast-1.1 {
    execsql {SELECT x'616263'}
  } abc
  do_test cast-1.2 {
    execsql {SELECT typeof(x'616263')}
  } blob
  do_test cast-1.3 {
    execsql {SELECT CAST(x'616263' AS text)}
  } abc
  do_test cast-1.4 {
    execsql {SELECT typeof(CAST(x'616263' AS text))}
  } text
  do_test cast-1.5 {
    execsql {SELECT CAST(x'616263' AS numeric)}
  } 0
  do_test cast-1.6 {
    execsql {SELECT typeof(CAST(x'616263' AS numeric))}
  } integer
  do_test cast-1.7 {
    execsql {SELECT CAST(x'616263' AS blob)}
  } abc
  do_test cast-1.8 {
    execsql {SELECT typeof(CAST(x'616263' AS blob))}
  } blob
  do_test cast-1.9 {
    execsql {SELECT CAST(x'616263' AS integer)}
  } 0
  do_test cast-1.10 {
    execsql {SELECT typeof(CAST(x'616263' AS integer))}
  } integer
}
do_test cast-1.11 {
  execsql {SELECT null}
} {{}}
do_test cast-1.12 {
  execsql {SELECT typeof(NULL)}
} null
do_test cast-1.13 {
  execsql {SELECT CAST(NULL AS text)}
} {{}}
do_test cast-1.14 {
  execsql {SELECT typeof(CAST(NULL AS text))}
} null
do_test cast-1.15 {
  execsql {SELECT CAST(NULL AS numeric)}
} {{}}
do_test cast-1.16 {
  execsql {SELECT typeof(CAST(NULL AS numeric))}
} null
do_test cast-1.17 {
  execsql {SELECT CAST(NULL AS blob)}
} {{}}
do_test cast-1.18 {
  execsql {SELECT typeof(CAST(NULL AS blob))}
} null
do_test cast-1.19 {
  execsql {SELECT CAST(NULL AS integer)}
} {{}}
do_test cast-1.20 {
  execsql {SELECT typeof(CAST(NULL AS integer))}
} null
do_test cast-1.21 {
  execsql {SELECT 123}
} {123}
do_test cast-1.22 {
  execsql {SELECT typeof(123)}
} integer
do_test cast-1.23 {
  execsql {SELECT CAST(123 AS text)}
} {123}
do_test cast-1.24 {
  execsql {SELECT typeof(CAST(123 AS text))}
} text
do_test cast-1.25 {
  execsql {SELECT CAST(123 AS numeric)}
} 123
do_test cast-1.26 {
  execsql {SELECT typeof(CAST(123 AS numeric))}
} integer
do_test cast-1.27 {
  execsql {SELECT CAST(123 AS blob)}
} {123}
do_test cast-1.28 {
  execsql {SELECT typeof(CAST(123 AS blob))}
} blob
do_test cast-1.29 {
  execsql {SELECT CAST(123 AS integer)}
} {123}
do_test cast-1.30 {
  execsql {SELECT typeof(CAST(123 AS integer))}
} integer
do_test cast-1.31 {
  execsql {SELECT 123.456}
} {123.456}
do_test cast-1.32 {
  execsql {SELECT typeof(123.456)}
} real
do_test cast-1.33 {
  execsql {SELECT CAST(123.456 AS text)}
} {123.456}
do_test cast-1.34 {
  execsql {SELECT typeof(CAST(123.456 AS text))}
} text
do_test cast-1.35 {
  execsql {SELECT CAST(123.456 AS numeric)}
} 123.456
do_test cast-1.36 {
  execsql {SELECT typeof(CAST(123.456 AS numeric))}
} real
do_test cast-1.37 {
  execsql {SELECT CAST(123.456 AS blob)}
} {123.456}
do_test cast-1.38 {
  execsql {SELECT typeof(CAST(123.456 AS blob))}
} blob
do_test cast-1.39 {
  execsql {SELECT CAST(123.456 AS integer)}
} {123}
do_test cast-1.38 {
  execsql {SELECT typeof(CAST(123.456 AS integer))}
} integer
do_test cast-1.41 {
  execsql {SELECT '123abc'}
} {123abc}
do_test cast-1.42 {
  execsql {SELECT typeof('123abc')}
} text
do_test cast-1.43 {
  execsql {SELECT CAST('123abc' AS text)}
} {123abc}
do_test cast-1.44 {
  execsql {SELECT typeof(CAST('123abc' AS text))}
} text
do_test cast-1.45 {
  execsql {SELECT CAST('123abc' AS numeric)}
} 123
do_test cast-1.46 {
  execsql {SELECT typeof(CAST('123abc' AS numeric))}
} integer
do_test cast-1.47 {
  execsql {SELECT CAST('123abc' AS blob)}
} {123abc}
do_test cast-1.48 {
  execsql {SELECT typeof(CAST('123abc' AS blob))}
} blob
do_test cast-1.49 {
  execsql {SELECT CAST('123abc' AS integer)}
} 123
do_test cast-1.50 {
  execsql {SELECT typeof(CAST('123abc' AS integer))}
} integer
do_test cast-1.51 {
  execsql {SELECT CAST('123.5abc' AS numeric)}
} 123.5
do_test cast-1.53 {
  execsql {SELECT CAST('123.5abc' AS integer)}
} 123

# Ticket #1662.  Ignore leading spaces in numbers when casting.
#
do_test cast-2.1 {
  execsql {SELECT CAST('   123' AS integer)}
} 123
do_test cast-2.2 {
  execsql {SELECT CAST('   -123.456' AS real)}
} -123.456

# ticket #2364.  Use full percision integers if possible when casting
# to numeric.  Do not fallback to real (and the corresponding 48-bit
# mantissa) unless absolutely necessary.
#
do_test cast-3.1 {
  execsql {SELECT CAST(9223372036854774800 AS integer)}
} 9223372036854774800
do_test cast-3.2 {
  execsql {SELECT CAST(9223372036854774800 AS numeric)}
} 9223372036854774800
do_test cast-3.3 {
  execsql {SELECT CAST(9223372036854774800 AS real)}
} 9.22337203685477e+18
do_test cast-3.4 {
  execsql {SELECT CAST(CAST(9223372036854774800 AS real) AS integer)}
} 9223372036854774784
do_test cast-3.5 {
  execsql {SELECT CAST(-9223372036854774800 AS integer)}
} -9223372036854774800
do_test cast-3.6 {
  execsql {SELECT CAST(-9223372036854774800 AS numeric)}
} -9223372036854774800
do_test cast-3.7 {
  execsql {SELECT CAST(-9223372036854774800 AS real)}
} -9.22337203685477e+18
do_test cast-3.8 {
  execsql {SELECT CAST(CAST(-9223372036854774800 AS real) AS integer)}
} -9223372036854774784
do_test cast-3.11 {
  execsql {SELECT CAST('9223372036854774800' AS integer)}
} 9223372036854774800
do_test cast-3.12 {
  execsql {SELECT CAST('9223372036854774800' AS numeric)}
} 9223372036854774800
do_test cast-3.13 {
  execsql {SELECT CAST('9223372036854774800' AS real)}
} 9.22337203685477e+18
do_test cast-3.14 {
  execsql {SELECT CAST(CAST('9223372036854774800' AS real) AS integer)}
} 9223372036854774784
do_test cast-3.15 {
  execsql {SELECT CAST('-9223372036854774800' AS integer)}
} -9223372036854774800
do_test cast-3.16 {
  execsql {SELECT CAST('-9223372036854774800' AS numeric)}
} -9223372036854774800
do_test cast-3.17 {
  execsql {SELECT CAST('-9223372036854774800' AS real)}
} -9.22337203685477e+18
do_test cast-3.18 {
  execsql {SELECT CAST(CAST('-9223372036854774800' AS real) AS integer)}
} -9223372036854774784
if {[db eval {PRAGMA encoding}]=="UTF-8"} {
  do_test cast-3.21 {
    execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS integer)}
  } 9223372036854774800
  do_test cast-3.22 {
    execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS numeric)}
  } 9223372036854774800
  do_test cast-3.23 {
    execsql {SELECT CAST(x'39323233333732303336383534373734383030' AS real)}
  } 9.22337203685477e+18
  do_test cast-3.24 {
    execsql {SELECT CAST(CAST(x'39323233333732303336383534373734383030' AS real) AS integer)}
  } 9223372036854774784
}
do_test case-3.31 {
  execsql {SELECT CAST(NULL AS numeric)}
} {{}}

# Test to see if it is possible to trick SQLite into reading past 
# the end of a blob when converting it to a number.
do_test cast-3.32.1 {
  set blob "1234567890"
  set DB [sqlite3_connection_pointer db]
  set ::STMT [sqlite3_prepare $DB {SELECT CAST(? AS real)} -1 TAIL]
  sqlite3_bind_blob -static $::STMT 1 $blob 5
  sqlite3_step $::STMT
} {SQLITE_ROW}
do_test cast-3.32.2 {
  sqlite3_column_int $::STMT 0
} {12345}
do_test cast-3.32.3 {
  sqlite3_finalize $::STMT
} {SQLITE_OK}

finish_test