xref: /sqlite-3.40.0/test/zeroblob.test (revision ae7e151a) 
1# 2007 May 02
2#
3# The author disclaims copyright to this source code.  In place of
4# a legal notice, here is a blessing:
5#
6#    May you do good and not evil.
7#    May you find forgiveness for yourself and forgive others.
8#    May you share freely, never taking more than you give.
9#
10#***********************************************************************
11# This file implements regression tests for SQLite library.  The
12# focus of this file is testing of the zero-filled blob functionality
13# including the sqlite3_bind_zeroblob(), sqlite3_result_zeroblob(),
14# and the built-in zeroblob() SQL function.
15#
16# $Id: zeroblob.test,v 1.2 2007/05/02 16:51:59 drh Exp $
17
18set testdir [file dirname $argv0]
19source $testdir/tester.tcl
20
21# When zeroblob() is used for the last field of a column, then the
22# content of the zeroblob is never instantiated on the VDBE stack.
23# But it does get inserted into the database correctly.
24#
25do_test zeroblob-1.1 {
26  execsql {
27    CREATE TABLE t1(a,b,c,d);
28  }
29  set ::sqlite3_max_blobsize 0
30  execsql {
31    INSERT INTO t1 VALUES(2,3,4,zeroblob(10000));
32  }
33  set ::sqlite3_max_blobsize
34} {10}
35do_test zeroblob-1.2 {
36  execsql {
37    SELECT length(d) FROM t1
38  }
39} {10000}
40
41# If a non-NULL column follows the zeroblob, then the content of
42# the zeroblob must be instantiated.
43#
44do_test zeroblob-1.3 {
45  set ::sqlite3_max_blobsize 0
46  execsql {
47    INSERT INTO t1 VALUES(3,4,zeroblob(10000),5);
48  }
49  set ::sqlite3_max_blobsize
50} {10010}
51do_test zeroblob-1.4 {
52  execsql {
53    SELECT length(c), length(d) FROM t1
54  }
55} {1 10000 10000 1}
56
57# Multiple zeroblobs can appear at the end of record.  No instantiation
58# of the blob content occurs on the stack.
59#
60do_test zeroblob-1.5 {
61  set ::sqlite3_max_blobsize 0
62  execsql {
63    INSERT INTO t1 VALUES(4,5,zeroblob(10000),zeroblob(10000));
64  }
65  set ::sqlite3_max_blobsize
66} {11}
67do_test zeroblob-1.6 {
68  execsql {
69    SELECT length(c), length(d) FROM t1
70  }
71} {1 10000 10000 1 10000 10000}
72
73# NULLs can follow the zeroblob() or be intermixed with zeroblobs and
74# no instantiation of the zeroblobs occurs on the stack.
75#
76do_test zeroblob-1.7 {
77  set ::sqlite3_max_blobsize 0
78  execsql {
79    INSERT INTO t1 VALUES(5,zeroblob(10000),NULL,zeroblob(10000));
80  }
81  set ::sqlite3_max_blobsize
82} {10}
83do_test zeroblob-1.8 {
84  execsql {
85    SELECT length(b), length(d) FROM t1 WHERE a=5
86  }
87} {10000 10000}
88
89# Comparisons against zeroblobs work.
90#
91do_test zeroblob-2.1 {
92  execsql {
93    SELECT a FROM t1 WHERE b=zeroblob(10000)
94  }
95} {5}
96
97# Comparisons against zeroblobs work even when indexed.
98#
99do_test zeroblob-2.2 {
100  execsql {
101    CREATE INDEX i1_1 ON t1(b);
102    SELECT a FROM t1 WHERE b=zeroblob(10000);
103  }
104} {5}
105
106# DISTINCT works for zeroblobs
107#
108do_test zeroblob-3.1 {
109  execsql {
110    SELECT count(DISTINCT a) FROM (
111      SELECT x'00000000000000000000' AS a
112      UNION ALL
113      SELECT zeroblob(10) AS a
114    )
115  }
116} {1}
117
118
119finish_test
120