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516699af23
the READ_ONLY global variable now allows statements which are to update only temporary tables (note: if a statement, after parse stage, looks like it will update a non-temp table, it will be rejected, even if at execution it would have turned out that 0 rows would be updated; for example UPDATE my_non_tem_table SET a=1 WHERE 1 = 0; will be rejected). sql/sql_parse.cc: The READ_ONLY global variable now allows statements which are to update only temporary tables (note: if a statement, after parse stage, looks like it will update a non-temp table, it will be rejected, even if at execution it would have turned out that 0 rows would be updated; for example UPDATE my_non_tem_table SET a=1 WHERE 1 = 0; will be rejected). mysql-test/r/read_only.result: result for new test mysql-test/t/read_only.test: test for READ_ONLY (there was none!) and for the new behaviour of READ_ONLY
103 lines
2 KiB
Text
103 lines
2 KiB
Text
# Test of the READ_ONLY global variable:
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# check that it blocks updates unless they are only on temporary tables.
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--disable_warnings
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DROP TABLE IF EXISTS t1,t2,t3;
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--enable_warnings
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# READ_ONLY does nothing to SUPER users
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# so we use a non-SUPER one:
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grant CREATE, SELECT, DROP on *.* to test@localhost;
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connect (con1,localhost,test,,test);
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connection default;
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set global read_only=0;
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connection con1;
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create table t1 (a int);
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insert into t1 values(1);
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create table t2 select * from t1;
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connection default;
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set global read_only=1;
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# We check that SUPER can:
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create table t3 (a int);
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drop table t3;
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connection con1;
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select @@global.read_only;
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--error 1290
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create table t3 (a int);
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--error 1290
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insert into t1 values(1);
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# if a statement, after parse stage, looks like it will update a
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# non-temp table, it will be rejected, even if at execution it would
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# have turned out that 0 rows would be updated
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--error 1290
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update t1 set a=1 where 1=0;
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# multi-update is special (see sql_parse.cc) so we test it
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--error 1290
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update t1,t2 set t1.a=t2.a+1 where t1.a=t2.a;
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# check multi-delete to be sure
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--error 1290
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delete t1,t2 from t1,t2 where t1.a=t2.a;
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# With temp tables updates should be accepted:
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create temporary table t3 (a int);
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create temporary table t4 (a int) select * from t3;
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insert into t3 values(1);
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insert into t4 select * from t3;
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# a non-temp table updated:
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--error 1290
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update t1,t3 set t1.a=t3.a+1 where t1.a=t3.a;
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# no non-temp table updated (just swapped):
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update t1,t3 set t3.a=t1.a+1 where t1.a=t3.a;
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update t4,t3 set t4.a=t3.a+1 where t4.a=t3.a;
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--error 1290
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delete t1 from t1,t3 where t1.a=t3.a;
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delete t3 from t1,t3 where t1.a=t3.a;
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delete t4 from t3,t4 where t4.a=t3.a;
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# and even homonymous ones
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create temporary table t1 (a int);
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insert into t1 values(1);
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update t1,t3 set t1.a=t3.a+1 where t1.a=t3.a;
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delete t1 from t1,t3 where t1.a=t3.a;
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drop table t1;
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--error 1290
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insert into t1 values(1);
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connection default;
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drop table t1,t2;
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drop user test@localhost;
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