Using Data Types from Other Database Engines
To facilitate the use of code written for SQL implementations from other vendors, MySQL maps data types as shown in the following table. These mappings make it easier to import table definitions from other database systems into MySQL.
| Other Vendor Type | MySQL Type |
|---|---|
BOOL |
TINYINT |
BOOLEAN |
TINYINT |
CHARACTER VARYING( |
VARCHAR( |
FIXED |
DECIMAL |
FLOAT4 |
FLOAT |
FLOAT8 |
DOUBLE |
INT1 |
TINYINT |
INT2 |
SMALLINT |
INT3 |
MEDIUMINT |
INT4 |
INT |
INT8 |
BIGINT |
LONG VARBINARY |
MEDIUMBLOB |
LONG VARCHAR |
MEDIUMTEXT |
LONG |
MEDIUMTEXT |
MIDDLEINT |
MEDIUMINT |
NUMERIC |
DECIMAL |
| 类型名称 | 显示长度 | 数据库类型 | JAVA类型 | JDBC类型索引(int) | 描述 |
| VARCHAR | L+N | VARCHAR | java.lang.String | 12 | |
| CHAR | N | CHAR | java.lang.String | 1 | |
| BLOB | L+N | BLOB | java.lang.byte[] | -4 | |
| TEXT | 65535 | VARCHAR | java.lang.String | -1 | |
| INTEGER | 4 | INTEGER UNSIGNED | java.lang.Long | 4 | |
| TINYINT | 3 | TINYINT UNSIGNED | java.lang.Integer | -6 | |
| SMALLINT | 5 | SMALLINT UNSIGNED | java.lang.Integer | 5 | |
| MEDIUMINT | 8 | MEDIUMINT UNSIGNED | java.lang.Integer | 4 | |
| BIT | 1 | BIT | java.lang.Boolean | -7 | |
| BIGINT | 20 | BIGINT UNSIGNED | java.math.BigInteger | -5 | |
| FLOAT | 4+8 | FLOAT | java.lang.Float | 7 | |
| DOUBLE | 22 | DOUBLE | java.lang.Double | 8 | |
| DECIMAL | 11 | DECIMAL | java.math.BigDecimal | 3 | |
| BOOLEAN | 1 | 同TINYINT | |||
| ID | 11 | PK (INTEGER UNSIGNED) | java.lang.Long | 4 | |
| DATE | 10 | DATE | java.sql.Date | 91 | |
| TIME | 8 | TIME | java.sql.Time | 92 | |
| DATETIME | 19 | DATETIME | java.sql.Timestamp | 93 | |
| TIMESTAMP | 19 | TIMESTAMP | java.sql.Timestamp | 93 | |
| YEAR | 4 | YEAR |