The following compares the MySql Data Types and Java Data Types in the form of a list. If you are interested in the MySql data types, take a look.
Java mysql Data Type comparison
Type name |
Display Length |
Database Type |
JAVA type |
JDBC index (int) |
Description |
|
|
|
|
|
|
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
|
The preceding table corresponds to the Java data type and MySql data type.
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.
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