substr.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.

# 2007 May 14
#
# 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 built-in SUBSTR() functions.
#
# $Id: substr.test,v 1.1 2007/05/15 01:13:47 drh Exp $

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

# Create a table to work with.
#
execsql { 
  CREATE TABLE t1(t text, b blob)
}
proc substr-test {id string i1 i2 result} {
  db eval {
    DELETE FROM t1;
    INSERT INTO t1(t) VALUES($string)
  }
  do_test substr-$id.1 [subst {
    execsql {
      SELECT substr(t, $i1, $i2) FROM t1
    }
  }] [list $result]
  set qstr '[string map {' ''} $string]'
  do_test substr-$id.2 [subst {
    execsql {
      SELECT substr($qstr, $i1, $i2)
    }
  }] [list $result]
}
proc subblob-test {id hex i1 i2 hexresult} {
  db eval "
    DELETE FROM t1;
    INSERT INTO t1(b) VALUES(x'$hex')
  "
  do_test substr-$id.1 [subst {
    execsql {
      SELECT hex(substr(b, $i1, $i2)) FROM t1
    }
  }] [list $hexresult]
  do_test substr-$id.2 [subst {
    execsql {
      SELECT hex(substr(x'$hex', $i1, $i2))
    }
  }] [list $hexresult]
}

# Basic SUBSTR functionality
#
substr-test 1.1 abcdefg 1 1 a
substr-test 1.2 abcdefg 2 1 b
substr-test 1.3 abcdefg 1 2 ab
substr-test 1.4 abcdefg 1 100 abcdefg
substr-test 1.5 abcdefg 0 1 a
substr-test 1.6 abcdefg -1 1 g
substr-test 1.7 abcdefg -1 10 g
substr-test 1.8 abcdefg -5 3 cde
substr-test 1.9 abcdefg -7 3 abc
substr-test 1.10 abcdefg -100 98 abcde

# Make sure everything works with long unicode characters
#
substr-test 2.1 \u1234\u2345\u3456 1 1 \u1234
substr-test 2.2 \u1234\u2345\u3456 2 1 \u2345
substr-test 2.3 \u1234\u2345\u3456 1 2 \u1234\u2345
substr-test 2.4 \u1234\u2345\u3456 -1 1 \u3456
substr-test 2.5 a\u1234b\u2345c\u3456c -5 3 b\u2345c

# Basic functionality for BLOBs
#
subblob-test 3.1 61626364656667 1 1 61
subblob-test 3.2 61626364656667 2 1 62
subblob-test 3.3 61626364656667 1 2 6162
subblob-test 3.4 61626364656667 1 100 61626364656667
subblob-test 3.5 61626364656667 0 1 61
subblob-test 3.6 61626364656667 -1 1 67
subblob-test 3.7 61626364656667 -1 10 67
subblob-test 3.8 61626364656667 -5 3 636465
subblob-test 3.9 61626364656667 -7 3 616263
subblob-test 3.10 61626364656667 -100 98 6162636465

# If these blobs were strings, then they would contain multi-byte
# characters.  But since they are blobs, the substr indices refer
# to bytes.
#
subblob-test 4.1 61E188B462E28D8563E3919663 1 1 61
subblob-test 4.2 61E188B462E28D8563E3919663 2 1 E1
subblob-test 4.3 61E188B462E28D8563E3919663 1 2 61E1
subblob-test 4.4 61E188B462E28D8563E3919663 -2 1 96
subblob-test 4.5 61E188B462E28D8563E3919663 -5 4 63E39196
subblob-test 4.6 61E188B462E28D8563E3919663 -100 98 61E188B462E28D8563E391 

finish_test