# 2007 May 02
#
# 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 of the zero-filled blob functionality
# including the sqlite3_bind_zeroblob(), sqlite3_result_zeroblob(),
# and the built-in zeroblob() SQL function.
#
# $Id: zeroblob.test,v 1.4 2007/05/23 06:31:39 drh Exp $
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !incrblob {
finish_test
return
}
# When zeroblob() is used for the last field of a column, then the
# content of the zeroblob is never instantiated on the VDBE stack.
# But it does get inserted into the database correctly.
#
do_test zeroblob-1.1 {
execsql {
CREATE TABLE t1(a,b,c,d);
}
set ::sqlite3_max_blobsize 0
execsql {
INSERT INTO t1 VALUES(2,3,4,zeroblob(10000));
}
set ::sqlite3_max_blobsize
} {10}
do_test zeroblob-1.2 {
execsql {
SELECT length(d) FROM t1
}
} {10000}
# If a non-NULL column follows the zeroblob, then the content of
# the zeroblob must be instantiated.
#
do_test zeroblob-1.3 {
set ::sqlite3_max_blobsize 0
execsql {
INSERT INTO t1 VALUES(3,4,zeroblob(10000),5);
}
set ::sqlite3_max_blobsize
} {10010}
do_test zeroblob-1.4 {
execsql {
SELECT length(c), length(d) FROM t1
}
} {1 10000 10000 1}
# Multiple zeroblobs can appear at the end of record. No instantiation
# of the blob content occurs on the stack.
#
do_test zeroblob-1.5 {
set ::sqlite3_max_blobsize 0
execsql {
INSERT INTO t1 VALUES(4,5,zeroblob(10000),zeroblob(10000));
}
set ::sqlite3_max_blobsize
} {11}
do_test zeroblob-1.6 {
execsql {
SELECT length(c), length(d) FROM t1
}
} {1 10000 10000 1 10000 10000}
# NULLs can follow the zeroblob() or be intermixed with zeroblobs and
# no instantiation of the zeroblobs occurs on the stack.
#
do_test zeroblob-1.7 {
set ::sqlite3_max_blobsize 0
execsql {
INSERT INTO t1 VALUES(5,zeroblob(10000),NULL,zeroblob(10000));
}
set ::sqlite3_max_blobsize
} {10}
do_test zeroblob-1.8 {
execsql {
SELECT length(b), length(d) FROM t1 WHERE a=5
}
} {10000 10000}
# Comparisons against zeroblobs work.
#
do_test zeroblob-2.1 {
execsql {
SELECT a FROM t1 WHERE b=zeroblob(10000)
}
} {5}
# Comparisons against zeroblobs work even when indexed.
#
do_test zeroblob-2.2 {
execsql {
CREATE INDEX i1_1 ON t1(b);
SELECT a FROM t1 WHERE b=zeroblob(10000);
}
} {5}
# DISTINCT works for zeroblobs
#
do_test zeroblob-3.1 {
execsql {
SELECT count(DISTINCT a) FROM (
SELECT x'00000000000000000000' AS a
UNION ALL
SELECT zeroblob(10) AS a
)
}
} {1}
# Concatentation works with zeroblob
#
do_test zeroblob-4.1 {
execsql {
SELECT hex(zeroblob(2) || x'61')
}
} {000061}
finish_test