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Evaluate typeof(X) and length(Y) where X is any column and Y is a blob column

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without actually loading X and Y from disk.

FossilOrigin-Name: b899dbeb60752843287e2c6ad3577e1d00f0d587
This commit is contained in:
drh
2012-03-28 01:34:47 +00:00
parent cd217e7397
commit a748fdcc43
11 changed files with 148 additions and 51 deletions
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test/pager1.test
+28 -3
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@@ -1768,7 +1768,7 @@ do_test pager1-18.2 {
catchsql { SELECT count(*) FROM t1 } db2
} {1 {database disk image is malformed}}
db2 close
do_test pager1-18.3 {
do_test pager1-18.3.1 {
execsql {
CREATE TABLE t2(x);
INSERT INTO t2 VALUES(a_string(5000));
@@ -1776,13 +1776,38 @@ do_test pager1-18.3 {
set pgno [expr ([file size test.db] / 1024)-2]
hexio_write test.db [expr ($pgno-1)*1024] 00000000
sqlite3 db2 test.db
catchsql { SELECT length(x) FROM t2 } db2
# even though x is malformed, because typeof() does
# not load the content of x, the error is not noticed.
catchsql { SELECT typeof(x) FROM t2 } db2
} {0 text}
do_test pager1-18.3.2 {
# in this case, the value of x is loaded and so the error is
# detected
catchsql { SELECT length(x||'') FROM t2 } db2
} {1 {database disk image is malformed}}
db2 close
do_test pager1-18.3.3 {
execsql {
DELETE FROM t2;
INSERT INTO t2 VALUES(randomblob(5000));
}
set pgno [expr ([file size test.db] / 1024)-2]
hexio_write test.db [expr ($pgno-1)*1024] 00000000
sqlite3 db2 test.db
# even though x is malformed, because length() and typeof() do
# not load the content of x, the error is not noticed.
catchsql { SELECT length(x), typeof(x) FROM t2 } db2
} {0 {5000 blob}}
do_test pager1-18.3.4 {
# in this case, the value of x is loaded and so the error is
# detected
catchsql { SELECT length(x||'') FROM t2 } db2
} {1 {database disk image is malformed}}
db2 close
do_test pager1-18.4 {
hexio_write test.db [expr ($pgno-1)*1024] 90000000
sqlite3 db2 test.db
catchsql { SELECT length(x) FROM t2 } db2
catchsql { SELECT length(x||'') FROM t2 } db2
} {1 {database disk image is malformed}}
db2 close
do_test pager1-18.5 {