MySQL数值类型溢出的处理方法

DROP TABLE IF EXISTS `na`;
CREATE TABLE `na` (
n1 INT(0) NOT NULL DEFAULT '0',
n2 INT(11) NOT NULL DEFAULT '0'
);

mysql> INSERT INTO `na` VALUES(520,520),(5201314,5201314);
Query OK, 2 rows affected (0.02 sec)
Records: 2 Duplicates: 0 Warnings: 0

mysql> SELECT * FROM na;
+---------+---------+
| n1 | n2 |
+---------+---------+
| 520 | 520 |
| 5201314 | 5201314 |
+---------+---------+
2 rows in set (0.00 sec)

CREATE TABLE t1 (
i1 TINYINT,
i2 TINYINT UNSIGNED
);

mysql> SET sql_mode = 'TRADITIONAL'; -- 首先设置严格模式
mysql> INSERT INTO t1 (i1, i2) VALUES(256, 256);
ERROR 1264 (22003): Out of range value for column 'i1' at row 1
mysql> SELECT * FROM t1;
Empty set (0.00 sec)

mysql> SET sql_mode = ''; -- 禁用所有模式
mysql> INSERT INTO t1 (i1, i2) VALUES(256, 256);
mysql> SHOW WARNINGS;
+---------+------+---------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------+
| Warning | 1264 | Out of range value for column 'i1' at row 1 |
| Warning | 1264 | Out of range value for column 'i2' at row 1 |
+---------+------+---------------------------------------------+
mysql> SELECT * FROM t1;
+------+------+
| i1 | i2 |
+------+------+
| 127 | 255 |
+------+------+

mysql> SELECT 9223372036854775807 + 1;
ERROR 1690 (22003): BIGINT value is out of range in '(9223372036854775807 + 1)'

mysql> SELECT CAST(9223372036854775807 AS UNSIGNED) + 1;
+-------------------------------------------+
| CAST(9223372036854775807 AS UNSIGNED) + 1 |
+-------------------------------------------+
| 9223372036854775808 |
+-------------------------------------------+

mysql> SELECT 9223372036854775807.0 + 1;
+---------------------------+
| 9223372036854775807.0 + 1 |
+---------------------------+
| 9223372036854775808.0 |
+---------------------------+

mysql> SET sql_mode = '';
Query OK, 0 rows affected (0.00 sec)

mysql> SELECT CAST(0 AS UNSIGNED) - 1;
ERROR 1690 (22003): BIGINT UNSIGNED value is out of range in '(cast(0 as unsigned) - 1)'

mysql> SET sql_mode = 'NO_UNSIGNED_SUBTRACTION';
mysql> SELECT CAST(0 AS UNSIGNED) - 1;
+-------------------------+
| CAST(0 AS UNSIGNED) - 1 |
+-------------------------+
| -1 |
+-------------------------+