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# 2008 July 11
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library.
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#
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# This file experiments with recursion using the "test_eval()" SQL function
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# in order to make sure that SQLite is reentrant.
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#
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# $Id: eval.test,v 1.1 2008/07/11 21:02:54 drh Exp $
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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# Create a table to work with.
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#
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do_test eval-1.1 {
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execsql {
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CREATE TABLE t1(x INTEGER PRIMARY KEY);
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INSERT INTO t1 VALUES(1);
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INSERT INTO t1 VALUES(2);
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INSERT INTO t1 SELECT x+2 FROM t1;
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INSERT INTO t1 SELECT x+4 FROM t1;
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INSERT INTO t1 SELECT x+8 FROM t1;
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INSERT INTO t1 SELECT x+16 FROM t1;
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INSERT INTO t1 SELECT x+32 FROM t1;
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INSERT INTO t1 SELECT x+64 FROM t1;
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INSERT INTO t1 SELECT x+128 FROM t1;
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INSERT INTO t1 SELECT x+256 FROM t1;
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SELECT count(*), max(x) FROM t1;
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}
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} {512 512}
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do_test eval-1.2 {
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execsql {
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SELECT x, test_eval('SELECT max(x) FROM t1 WHERE x<' || x) FROM t1 LIMIT 5
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}
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} {1 {} 2 1 3 2 4 3 5 4}
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# Delete a row out from under a read cursor in the middle of
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# collecting the arguments for a single row in a result set.
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# Verify that subsequent rows come out as NULL.
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#
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do_test eval-2.1 {
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execsql {
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CREATE TABLE t2(x,y);
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INSERT INTO t2 SELECT x, x+1 FROM t1 WHERE x<5;
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SELECT x, test_eval('DELETE FROM t2 WHERE x='||x), y FROM t2;
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}
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} {1 {} {} 2 {} {} 3 {} {} 4 {} {}}
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do_test eval-2.2 {
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execsql {
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SELECT * FROM t2
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}
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} {}
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# Modify a row while it is being read.
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#
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do_test eval-3.1 {
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execsql {
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INSERT INTO t2 SELECT x, x+1 FROM t1 WHERE x<5;
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SELECT x, test_eval('UPDATE t2 SET y=y+100 WHERE x='||x), y FROM t2;
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}
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} {1 {} 102 2 {} 103 3 {} 104 4 {} 105}
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finish_test
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