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SET @global_auto_increment_increment = @@global.auto_increment_increment;
SET @session_auto_increment_increment = @@session.auto_increment_increment;
SET @global_auto_increment_offset = @@global.auto_increment_offset;
SET @session_auto_increment_offset = @@session.auto_increment_offset;
drop table if exists t1;
CREATE TABLE t1
(
id INT NOT NULL auto_increment,
PRIMARY KEY (id),
name VARCHAR(30)
);
'#--------------------FN_DYNVARS_001_01-------------------------#'
## Setting initial value of auto_increment_increment to 5 ##
SET @@auto_increment_increment = 5;
'#--------------------FN_DYNVARS_001_02-------------------------#'
## Inserting first record in table to check behavior of the variable ##
INSERT into t1(name) values('Record_1');
SELECT * from t1;
id name
1 Record_1
## Changing value of variable to 10 ##
SET @@global.auto_increment_increment = 10;
## Inserting record and verifying value of column id ##
INSERT into t1(name) values('Record_2');
SELECT * from t1;
id name
1 Record_1
6 Record_2
## Test behavior of variable after assigning some larger value to it ##
SELECT @@auto_increment_increment;
@@auto_increment_increment
5
SET @@auto_increment_increment = 100;
INSERT into t1(name) values('Record_5');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
'#--------------------FN_DYNVARS_001_03-------------------------#'
## Creating new connection test_con1 ##
## Value of session & global vairable here should be 10 ##
SELECT @@global.auto_increment_increment = 10;
@@global.auto_increment_increment = 10
1
SELECT @@session.auto_increment_increment = 10;
@@session.auto_increment_increment = 10
1
## Setting global value of variable and inserting data in table ##
SET @@global.auto_increment_increment = 20;
SELECT @@global.auto_increment_increment;
@@global.auto_increment_increment
20
INSERT into t1(name) values('Record_6');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
## Setting session value of variable and inserting data in table ##
SET @@session.auto_increment_increment = 2;
SELECT @@session.auto_increment_increment;
@@session.auto_increment_increment
2
INSERT into t1(name) values('Record_8');
INSERT into t1(name) values('Record_9');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
113 Record_8
115 Record_9
'#--------------------FN_DYNVARS_001_04-------------------------#'
## Creating another new connection test_con2 ##
## Verifying initial values of variable in global & session scope ##
## global & session initial value should be 20 ##
SELECT @@global.auto_increment_increment = 20;
@@global.auto_increment_increment = 20
1
SELECT @@session.auto_increment_increment = 20;
@@session.auto_increment_increment = 20
1
## Setting value of session variable to 5 and verifying its behavior ##
SET @@session.auto_increment_increment = 5;
INSERT into t1(name) values('Record_10');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
113 Record_8
115 Record_9
116 Record_10
SET @@session.auto_increment_increment = 1;
SELECT @@auto_increment_increment;
@@auto_increment_increment
1
SELECT @@global.auto_increment_increment;
@@global.auto_increment_increment
20
'#--------------------FN_DYNVARS_001_05-------------------------#'
## Switching to test_con1 ##
## Verifying values of global & session value of variable ##
## global value should be 20 ##
SELECT @@global.auto_increment_increment = 20;
@@global.auto_increment_increment = 20
1
## session value should be 2 ##
SELECT @@session.auto_increment_increment = 2;
@@session.auto_increment_increment = 2
1
INSERT into t1(name) values('Record_11');
INSERT into t1(name) values('Record_12');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
113 Record_8
115 Record_9
116 Record_10
117 Record_11
119 Record_12
'#--------------------FN_DYNVARS_001_06-------------------------#'
## Changing column's datatype to SmallInt and verifying variable's behavior ##
ALTER table t1 MODIFY id SMALLINT NOT NULL auto_increment;
INSERT into t1(name) values('Record_13');
INSERT into t1(name) values('Record_14');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
113 Record_8
115 Record_9
116 Record_10
117 Record_11
119 Record_12
121 Record_13
123 Record_14
## Changing column's datatype to BigInt and verifying variable's behavior ##
ALTER table t1 MODIFY id BIGINT NOT NULL auto_increment;
INSERT into t1(name) values('Record_15');
INSERT into t1(name) values('Record_16');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
113 Record_8
115 Record_9
116 Record_10
117 Record_11
119 Record_12
121 Record_13
123 Record_14
125 Record_15
127 Record_16
'#--------------------FN_DYNVARS_001_07-------------------------#'
## Verifying behavior of variable with negative value ##
SET @@auto_increment_increment = -10;
Warnings:
Warning 1292 Truncated incorrect auto_increment_increment value: '-10'
INSERT into t1(name) values('Record_17');
INSERT into t1(name) values('Record_18');
SELECT * from t1;
id name
1 Record_1
6 Record_2
101 Record_5
111 Record_6
113 Record_8
115 Record_9
116 Record_10
117 Record_11
119 Record_12
121 Record_13
123 Record_14
125 Record_15
127 Record_16
128 Record_17
129 Record_18
## Disconnecting test_con2 ##
## Dropping table t1 ##
DROP table if exists t1;
## Disconnecting test_con1 ##
## switching to default connection ##
SET @@global.auto_increment_increment = @global_auto_increment_increment;
SET @@session.auto_increment_increment = @session_auto_increment_increment;
SET @@global.auto_increment_offset = @global_auto_increment_offset;
SET @@session.auto_increment_offset = @session_auto_increment_offset;