| Java数据类型和MySql数据类型对应一览 | | | | 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 | java.sql.Date | 91 |
以上就是Java数据类型和MySql数据类型对应表。
对于blob，一般用于对图片的数据库存储，原理是把图片打成二进制，然后进行的一种存储方式，在java中对应byte［］数组。
对于boolean类型，在mysql数据库中，个人认为用int类型代替较好，对bit操作不是很方便，尤其是在具有web页面开发的项目中，表示0/1，对应java类型的Integer较好。
| BIT(1) (new in MySQL-5.0) | BIT | java.lang.Boolean | | BIT( > 1) (new in MySQL-5.0) | BIT | byte[] | | TINYINT | TINYINT | java.lang.Boolean if the configuration property tinyInt1isBit is set to true (the
default) and the storage size is 1, or java.lang.Integer if not. | | BOOL, BOOLEAN | TINYINT | See TINYINT, above as these are aliases for TINYINT(1), currently. | | SMALLINT[(M)] [UNSIGNED] | SMALLINT [UNSIGNED] | java.lang.Integer (regardless if UNSIGNED or not) | | MEDIUMINT[(M)] [UNSIGNED] | MEDIUMINT [UNSIGNED] | java.lang.Integer, if UNSIGNED java.lang.Long (C/J 3.1 and earlier), or java.lang.Integer for
C/J 5.0 and later | | INT,INTEGER[(M)] [UNSIGNED] | INTEGER [UNSIGNED] | java.lang.Integer , if UNSIGNED java.lang.Long | | BIGINT[(M)] [UNSIGNED] | BIGINT [UNSIGNED] | java.lang.Long , if UNSIGNED java.math.BigInteger | | FLOAT[(M,D)] | FLOAT | java.lang.Float | | DOUBLE[(M,B)] | DOUBLE | java.lang.Double | | DECIMAL[(M[,D])] | DECIMAL | java.math.BigDecimal | | DATE | DATE | java.sql.Date | | DATETIME | DATETIME | java.sql.Timestamp | | TIMESTAMP[(M)] | TIMESTAMP | java.sql.Timestamp | | TIME | TIME | java.sql.Time | | YEAR[(2|4)] | YEAR | If yearIsDateType configuration property is set to false, then the returned object type is java.sql.Short . If set to true
(the default) then an object of type java.sql.Date (with the date set to January 1st, at midnight). | | CHAR(M) | CHAR | java.lang.String (unless the character set for the column is BINARY, then byte[] is returned. | | VARCHAR(M) [BINARY] | VARCHAR | java.lang.String (unless the character set for the column is BINARY, then byte[] is returned. | | BINARY(M) | BINARY | byte[] | | VARBINARY(M) | VARBINARY | byte[] | | TINYBLOB | TINYBLOB | byte[] | | TINYTEXT | VARCHAR | java.lang.String | | BLOB | BLOB | byte[] | | TEXT | VARCHAR | java.lang.String | | MEDIUMBLOB | MEDIUMBLOB | byte[] | | MEDIUMTEXT | VARCHAR | java.lang.String | | LONGBLOB | LONGBLOB | byte[] | | LONGTEXT | VARCHAR | java.lang.String | | ENUM('value1','value2',...) | CHAR | java.lang.String | | SET('value1','value2',...) | CHAR | java.lang.String |
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