Table of Java data types and MySql Data Types

Table of Java data types and MySql Data Types

This article describes the comparison between Java data types and MySql data types. We will share this with you for your reference. The details are as follows:

Type name	Display Length	Database Type	JAVA type	JDBC index (int)
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	Same as 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

For bolb, it is generally used to store images in a database. The principle is to compress the images into binary data and then store them in a storage method that corresponds to byte [] arrays in java.

For the boolen type, in the mysql database, I personally think it is better to replace the int type, it is not very convenient for bit operations, especially in projects with web page development, it indicates 0/1, the corresponding java type Integer is better.