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Java和MySQL数据类型对应一览

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更多 发布于:2016-08-01 15:17
Table 20.25. MySQL Types to Java Types for ResultSet.getObject()
MySQL Type Name
Return value ofGetColumnClassName Returned as Java Class
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, orjava.lang.Integer if not.
BOOL, BOOLEAN TINYINT See TINYINT, above as these are aliases forTINYINT(1), currently.
SMALLINT[(M)] [UNSIGNED] SMALLINT [UNSIGNED] java.lang.Integer (regardless ifUNSIGNED or not)
MEDIUMINT[(M)] [UNSIGNED] MEDIUMINT [UNSIGNED] java.lang.Integer, if UNSIGNEDjava.lang.Long (C/J 3.1 and earlier), orjava.lang.Integer for C/J 5.0 and later
INT,INTEGER[(M)] [UNSIGNED] INTEGER [UNSIGNED] java.lang.Integer, if UNSIGNEDjava.lang.Long
BIGINT[(M)] [UNSIGNED] BIGINT [UNSIGNED] java.lang.Long, if UNSIGNEDjava.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 isjava.sql.Short. If set to true (the default), then the returned object is of typejava.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
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。
我的概念中,mysql中的text字段应该是没有长度限制的,但是今天事实告诉我,text类型的长度是有限制的。其中mysql的text类型有64K长度限制的
工作中由于邮件的长度超过了64k,Text已经不适用,我们换用了MEDIUMTEXT 他的长度为16777215 (2^24 - 1) 为256*64K=16M

 

 

 

 

 

 

 

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