SSM15.4【Mybatis：Mybatis的多表操作总结】

 

 

 

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
 3 
 4 <!--The content of element type "configuration" must match
 5 "(properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,
 6 objectWrapperFactory?,reflectorFactory?,plugins?,environments?,databaseIdProvider?,mappers?)".-->
 7 
 8 <configuration>
 9 
10     <!--加载外部properties文件-->
11     <properties resource="jdbc.properties"></properties>
12 
13     <!--自定义别名-->
14     <typeAliases>
15         <typeAlias type="com.haifei.domain.User" alias="user" />
16         <typeAlias type="com.haifei.domain.Order" alias="order"/>
17         <typeAlias type="com.haifei.domain.Role" alias="role"/>
18     </typeAliases>
19 
20     <!--注册类型处理器-->
21     <typeHandlers>
22         <typeHandler handler="com.haifei.handler.DateTypeHandler"/>
23     </typeHandlers>
24 
25     <environments default="development">
26         <!--配置数据源环境-->
27         <environment id="development">
28             <transactionManager type="JDBC"></transactionManager>
29             <dataSource type="POOLED">
30                 <property name="driver" value="${jdbc.driver}"/>
31                 <property name="url" value="${jdbc.url}"/>
32                 <property name="username" value="${jdbc.username}"/>
33                 <property name="password" value="${jdbc.password}"/>
34             </dataSource>
35         </environment>
36     </environments>
37 
38     <!--加载映射文件-->
39     <mappers>
40         <mapper resource="com/haifei/mapper/UserMapper.xml"/>
41         <mapper resource="com/haifei/mapper/OrderMapper.xml"/>
42     </mappers>
43 
44 </configuration>
 1 package com.haifei.handler;
 2 
 3 import org.apache.ibatis.type.BaseTypeHandler;
 4 import org.apache.ibatis.type.JdbcType;
 5 
 6 import java.sql.CallableStatement;
 7 import java.sql.PreparedStatement;
 8 import java.sql.ResultSet;
 9 import java.sql.SQLException;
10 import java.util.Date;
11 
12 public class DateTypeHandler extends BaseTypeHandler<Date> {
13 
14     /**
15      * 将java数据类型 转换为 数据库所需的数据类型
16      * @param preparedStatement
17      * @param i
18      * @param date
19      * @param jdbcType
20      * @throws SQLException
21      */
22     @Override
23     public void setNonNullParameter(PreparedStatement preparedStatement, int i, Date date, JdbcType jdbcType) throws SQLException {
24         long time = date.getTime();
25         preparedStatement.setLong(i, time);
26     }
27 
28     /**
29      * 将数据库中的数据类型 转换为 所需的java数据类型
30      * @param resultSet  查询出的结果集
31      * @param s  要转换的字段名称
32      * @return
33      * @throws SQLException
34      */
35     @Override
36     public Date getNullableResult(ResultSet resultSet, String s) throws SQLException {
37         //获取结果集中需要的数据类型（long）转换为Date类型，并返回
38         long aLong = resultSet.getLong(s);
39         Date date = new Date(aLong);
40         return date;
41     }
42 
43     /**
44      * 将数据库中的数据类型 转换为 所需的java数据类型
45      * @param resultSet
46      * @param i
47      * @return
48      * @throws SQLException
49      */
50     @Override
51     public Date getNullableResult(ResultSet resultSet, int i) throws SQLException {
52         long aLong = resultSet.getLong(i);
53         Date date = new Date(aLong);
54         return date;
55     }
56 
57     /**
58      * 将数据库中的数据类型 转换为 所需的java数据类型
59      * @param callableStatement
60      * @param i
61      * @return
62      * @throws SQLException
63      */
64     @Override
65     public Date getNullableResult(CallableStatement callableStatement, int i) throws SQLException {
66         long aLong = callableStatement.getLong(i);
67         Date date = new Date(aLong);
68         return date;
69     }
70 }

 

posted @ 2021-07-25 11:44  yub4by  阅读(61)  评论(0)    收藏  举报