java mysql 数据类型对照。

男娘i 2024-02-18 15:02 15阅读 0赞

**java mysql 数据类型对照**

<table> 
 <tbody> 
 <tr> 
 <td>类型名称</td> 
 <td>显示长度</td> 
 <td>数据库类型</td> 
 <td>JAVA类型</td> 
 <td>JDBC类型索引(int)</td> 
 <td>描述</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>VARCHAR</td> 
 <td>L+N</td> 
 <td>VARCHAR</td> 
 <td>java.lang.String</td> 
 <td>12</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>CHAR</td> 
 <td>N</td> 
 <td>CHAR</td> 
 <td>java.lang.String</td> 
 <td>1</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>BLOB</td> 
 <td>L+N</td> 
 <td>BLOB</td> 
 <td>java.lang.byte[]</td> 
 <td>-4</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>TEXT</td> 
 <td>65535</td> 
 <td>VARCHAR</td> 
 <td>java.lang.String</td> 
 <td>-1</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>INTEGER</td> 
 <td>4</td> 
 <td>INTEGER UNSIGNED</td> 
 <td>java.lang.Long</td> 
 <td>4</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>TINYINT</td> 
 <td>3</td> 
 <td>TINYINT UNSIGNED</td> 
 <td>java.lang.Integer</td> 
 <td>-6</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>SMALLINT</td> 
 <td>5</td> 
 <td>SMALLINT UNSIGNED</td> 
 <td>java.lang.Integer</td> 
 <td>5</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>MEDIUMINT</td> 
 <td>8</td> 
 <td>MEDIUMINT UNSIGNED</td> 
 <td>java.lang.Integer</td> 
 <td>4</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>BIT</td> 
 <td>1</td> 
 <td>BIT</td> 
 <td>java.lang.Boolean</td> 
 <td>-7</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>BIGINT</td> 
 <td>20</td> 
 <td>BIGINT UNSIGNED</td> 
 <td>java.math.BigInteger</td> 
 <td>-5</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>FLOAT</td> 
 <td>4+8</td> 
 <td>FLOAT</td> 
 <td>java.lang.Float</td> 
 <td>7</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>DOUBLE</td> 
 <td>22</td> 
 <td>DOUBLE</td> 
 <td>java.lang.Double</td> 
 <td>8</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>DECIMAL</td> 
 <td>11</td> 
 <td>DECIMAL</td> 
 <td>java.math.BigDecimal</td> 
 <td>3</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>BOOLEAN</td> 
 <td>1</td> 
 <td>同TINYINT</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>ID</td> 
 <td>11</td> 
 <td>PK (INTEGER UNSIGNED)</td> 
 <td>java.lang.Long</td> 
 <td>4</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>DATE</td> 
 <td>10</td> 
 <td>DATE</td> 
 <td>java.sql.Date</td> 
 <td>91</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>TIME</td> 
 <td>8</td> 
 <td>TIME</td> 
 <td>java.sql.Time</td> 
 <td>92</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>DATETIME</td> 
 <td>19</td> 
 <td>DATETIME</td> 
 <td>java.sql.Timestamp</td> 
 <td>93</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>TIMESTAMP</td> 
 <td>19</td> 
 <td>TIMESTAMP</td> 
 <td>java.sql.Timestamp</td> 
 <td>93</td> 
 <td>&nbsp;</td> 
 </tr> 
 <tr> 
 <td>YEAR</td> 
 <td>4</td> 
 <td>YEAR</td> 
 <td>java.sql.Date</td> 
 <td>91 </td> 
 </tr> 
 </tbody> 
</table>

对于BOLB，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。

转载：[http://www.cnblogs.com/JemBai/archive/2009/08/20/1550683.html][http_www.cnblogs.com_JemBai_archive_2009_08_20_1550683.html]

[http_www.cnblogs.com_JemBai_archive_2009_08_20_1550683.html]: http://www.cnblogs.com/JemBai/archive/2009/08/20/1550683.html