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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;
## Creating New Table ##
CREATE TABLE t1
(
id INT NOT NULL auto_increment,
PRIMARY KEY (id),
name VARCHAR(30)
);
'#--------------------FN_DYNVARS_002_01-------------------------#'
## Setting initial value of variable to 5 ##
SET @@auto_increment_increment = 10;
SET @@auto_increment_offset = 5;
'#--------------------FN_DYNVARS_002_02-------------------------#'
## Inserting records in table and verifying variable's behavior ##
INSERT into t1(name) values('Record_1');
SELECT * from t1;
id name
5 Record_1
INSERT into t1(name) values('Record_2');
SELECT * from t1;
id name
5 Record_1
15 Record_2
## Test behavior of variable after updating value of variable ##
SET @@auto_increment_offset = 24;
SELECT @@auto_increment_offset;
@@auto_increment_offset
24
INSERT into t1(name) values('Record_3');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
INSERT into t1(name) values('Record_4');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
'#--------------------FN_DYNVARS_002_03-------------------------#'
## Changing value of global scope before opening new connection ##
SET @@global.auto_increment_increment = 15;
SET @@global.auto_increment_offset = 36;
## New connection test_con1 ##
## Value of session & global vairable here should be 10 ##
SELECT @@global.auto_increment_offset = 36;
@@global.auto_increment_offset = 36
1
SELECT @@session.auto_increment_offset = 36;
@@session.auto_increment_offset = 36
1
## Verify global value effect of variable by inserting new rows in table ##
INSERT into t1(name) values('Record_5');
INSERT into t1(name) values('Record_6');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
## Setting session value of variable and inserting data in table ##
SET @@session.auto_increment_offset = 54;
INSERT into t1(name) values('Record_7');
INSERT into t1(name) values('Record_8');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
'#--------------------FN_DYNVARS_002_04-------------------------#'
## Setting value of variable less than last insert id ##
SET @@session.auto_increment_offset = 5;
INSERT into t1(name) values('Record_9');
INSERT into t1(name) values('Record_10');
INSERT into t1(name) values('Record_11');
INSERT into t1(name) values('Record_12');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
80 Record_9
95 Record_10
110 Record_11
125 Record_12
'#--------------------FN_DYNVARS_002_05-------------------------#'
## Assigning value to variable greater than auto_increment_incrent value ##
SET @@auto_increment_offset = 140;
SET @@auto_increment_increment = 10;
INSERT into t1(name) values('Record_13');
INSERT into t1(name) values('Record_14');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
80 Record_9
95 Record_10
110 Record_11
125 Record_12
134 Record_13
140 Record_14
'#--------------------FN_DYNVARS_002_06-------------------------#'
## Changing datatype of column id with primary key to SmallInt ##
ALTER table t1 modify id SMALLINT NOT NULL auto_increment;
INSERT into t1(name) values('Record_15');
INSERT into t1(name) values('Record_16');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
80 Record_9
95 Record_10
110 Record_11
125 Record_12
134 Record_13
140 Record_14
150 Record_15
160 Record_16
## Changing datatype of column id with primary key to BigInt ##
ALTER table t1 modify id BIGINT NOT NULL auto_increment;
INSERT into t1(name) values('Record_17');
INSERT into t1(name) values('Record_18');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
80 Record_9
95 Record_10
110 Record_11
125 Record_12
134 Record_13
140 Record_14
150 Record_15
160 Record_16
170 Record_17
180 Record_18
'#--------------------FN_DYNVARS_002_07-------------------------#'
## Assigning -ve value to variable ##
SET @@auto_increment_offset = -10;
Warnings:
Warning 1292 Truncated incorrect auto_increment_offset value: '-10'
SELECT @@auto_increment_offset = -10;
@@auto_increment_offset = -10
0
INSERT into t1(name) values('Record_17');
INSERT into t1(name) values('Record_18');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
80 Record_9
95 Record_10
110 Record_11
125 Record_12
134 Record_13
140 Record_14
150 Record_15
160 Record_16
170 Record_17
180 Record_18
181 Record_17
191 Record_18
## Assigning value that is out of range of variable ##
SET @@auto_increment_offset = 65536;
Warnings:
Warning 1292 Truncated incorrect auto_increment_offset value: '65536'
SELECT @@auto_increment_offset;
@@auto_increment_offset
65535
INSERT into t1(name) values('Record_17');
INSERT into t1(name) values('Record_18');
INSERT into t1(name) values('Record_19');
INSERT into t1(name) values('Record_20');
SELECT * from t1;
id name
5 Record_1
15 Record_2
24 Record_3
34 Record_4
36 Record_5
51 Record_6
54 Record_7
69 Record_8
80 Record_9
95 Record_10
110 Record_11
125 Record_12
134 Record_13
140 Record_14
150 Record_15
160 Record_16
170 Record_17
180 Record_18
181 Record_17
191 Record_18
199 Record_17
209 Record_18
219 Record_19
229 Record_20
## No effect of auto_increment_offset since value of this variable is greater ##
## than auto_increment_increment ##
## Dropping table ##
DROP table if exists t1;
## Disconnecting connection ##
## 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;