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a49f5cae9a
Ensures that WRITE lock is not obtained on all tables referenced.
mysql-test/r/lock_multi.result:
Bug#4118
New test for multi-update locking
mysql-test/r/multi_update.result:
Bug#4118
Fix test
mysql-test/t/lock_multi.test:
Bug#4118
New test for multi-update locking
mysql-test/t/multi_update.test:
Bug#4118
Fix test
sql/sql_parse.cc:
Bug#4118
Split multi-update to its own case statement in sql_parse.cc
sql/sql_update.cc:
Bug#4118
Overview of locking checking:
1. Open and acquire READ lock
2. Check to see which tables need WRITE lock
3. Unlock tables and relock
sql/sql_yacc.yy:
Bug#4118
Split multi-update to its own case statement in sql_parse.cc
39 lines
772 B
Plaintext
39 lines
772 B
Plaintext
drop table if exists t1,t2;
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create table t1(n int);
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insert into t1 values (1);
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lock tables t1 write;
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update low_priority t1 set n = 4;
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select n from t1;
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unlock tables;
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n
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4
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drop table t1;
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create table t1(n int);
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insert into t1 values (1);
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lock tables t1 read;
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update low_priority t1 set n = 4;
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select n from t1;
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unlock tables;
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n
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1
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drop table t1;
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create table t1 (a int, b int);
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create table t2 (c int, d int);
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insert into t1 values(1,1);
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insert into t1 values(2,2);
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insert into t2 values(1,2);
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lock table t1 read;
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update t1,t2 set c=a where b=d;
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select c from t2;
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c
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2
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drop table t1;
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drop table t2;
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create table t1 (a int);
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create table t2 (a int);
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lock table t1 write, t2 write;
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insert t1 select * from t2;
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drop table t2;
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Table 'test.t2' doesn't exist
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drop table t1;
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