<!-- 加載配置文件 -->
<context:property-placeholder location="classpath:db.properties" />
<!-- 數(shù)據(jù)源，使用dbcp -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<property name="maxActive" value="10" />
<property name="maxIdle" value="5" />
</bean>
<!-- sqlSessinFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 加載mybatis的配置文件 -->
<property name="configLocation" value="mybatis/SqlMapConfig.xml" />
<!-- 數(shù)據(jù)源 -->
<property name="dataSource" ref="dataSource" />
</bean>

<!-- 原始dao接口 -->
<bean id="userDao" class="cn.itcast.ssm.dao.UserDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>

source_folder/UserDaoImplTest.java
public class UserDaoImplTest {
private ApplicationContext applicationContext;
//在setUp這個方法得到spring容器
@Before
public void setUp() throws Exception {
applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
}
@Test
public void testFindUserById() throws Exception {
UserDao userDao = (UserDao) applicationContext.getBean("userDao");
//調(diào)用userDao的方法
User user = userDao.findUserById(1);
System.out.println(user);
}
}

<table tableName="items"></table>
<table tableName="orders"></table>
<table tableName="orderdetail"></table>
<table tableName="user"></table>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
"http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>
<context id="testTables" targetRuntime="MyBatis3">
<commentGenerator>
<!-- 是否去除自動生成的注釋 true：是 ： false:否 -->
<property name="suppressAllComments" value="true" />
</commentGenerator>
<!--數(shù)據(jù)庫連接的信息：驅(qū)動類、連接地址、用戶名、密碼 -->
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/mybatis" userId="root"
password="mysql">
</jdbcConnection>
<!-- <jdbcConnection driverClass="oracle.jdbc.OracleDriver"
connectionURL="jdbc:oracle:thin:@127.0.0.1:1521:yycg" 
userId="yycg"
password="yycg">
</jdbcConnection> -->
<!-- 默認(rèn)false，把JDBC DECIMAL 和 NUMERIC 類型解析為 Integer，為 true時把JDBC DECIMAL 和 
NUMERIC 類型解析為java.math.BigDecimal -->
<javaTypeResolver>
<property name="forceBigDecimals" value="false" />
</javaTypeResolver>
<!-- targetProject:生成PO類的位置 -->
<javaModelGenerator targetPackage="cn.itcast.ssm.po"
targetProject=".\src">
<!-- enableSubPackages:是否讓schema作為包的后綴 -->
<property name="enableSubPackages" value="false" />
<!-- 從數(shù)據(jù)庫返回的值被清理前后的空格 -->
<property name="trimStrings" value="true" />
</javaModelGenerator>
<!-- targetProject:mapper映射文件生成的位置 -->
<sqlMapGenerator targetPackage="cn.itcast.ssm.mapper" 
targetProject=".\src">
<!-- enableSubPackages:是否讓schema作為包的后綴 -->
<property name="enableSubPackages" value="false" />
</sqlMapGenerator>
<!-- targetPackage：mapper接口生成的位置 -->
<javaClientGenerator type="XMLMAPPER"
targetPackage="cn.itcast.ssm.mapper" 
targetProject=".\src">
<!-- enableSubPackages:是否讓schema作為包的后綴 -->
<property name="enableSubPackages" value="false" />
</javaClientGenerator>
<!-- 指定數(shù)據(jù)庫表 -->
<table tableName="items"></table>
<table tableName="orders"></table>
<table tableName="orderdetail"></table>
<table tableName="user"></table>
</context>
</generatorConfiguration>

//自定義條件查詢
@Test
public void testSelectByExample() {
ItemsExample itemsExample = new ItemsExample();
//通過criteria構(gòu)造查詢條件
ItemsExample.Criteria criteria = itemsExample.createCriteria();
criteria.andNameEqualTo("筆記本3");
//可能返回多條記錄
List<Items> list = itemsMapper.selectByExample(itemsExample);
System.out.println(list);
}
//根據(jù)主鍵查詢
@Test
public void testSelectByPrimaryKey() {
Items items = itemsMapper.selectByPrimaryKey(1);
System.out.println(items);
}
//插入
@Test
public void testInsert() {
//構(gòu)造 items對象
Items items = new Items();
items.setName("手機(jī)");
items.setPrice(999f);
itemsMapper.insert(items);
}
//更新數(shù)據(jù)
@Test
public void testUpdateByPrimaryKey() {
//對所有字段進(jìn)行更新，需要先查詢出來再更新
Items items = itemsMapper.selectByPrimaryKey(1);
items.setName("水杯");
itemsMapper.updateByPrimaryKey(items);
//如果傳入字段不空為才更新，在批量更新中使用此方法，不需要先查詢再更新
//itemsMapper.updateByPrimaryKeySelective(record);
}