spring中提供了一个可以操作数据库的对象，对象封装了jdbc技术，与DBUtils中的QueryRunner非常相似，JDBCTemplateJDBC模板对象
准备工作
导包：
4+2
spring-test、spring-aop、
c3p0连接池、JDBC驱动
spring-jdbc、spring-tx事务
准备数据库
测试：
package cn.lc.a_jdbctemplate;
import org.junit.Test;
import org.springframework.jdbc.core.JdbcTemplate;
import com.mchange.v2.c3p0.ComboPooledDataSource;
//演示jdbc模板
public class Demo {
@Test
public void fun1() throws Exception{
//1准备连接池
ComboPooledDataSource dataSource = new ComboPooledDataSource();
dataSource.setDriverClass("com.mysql.jdbc.Driver");
dataSource.setJdbcUrl("jdbc:mysql:///hibernate");
dataSource.setUser("root");
dataSource.setPassword("");
//2创建jdbc模板对象
JdbcTemplate jt = new JdbcTemplate();
jt.setDataSource(dataSource);
//2.书写sql，并执行
String sql = "insert into t_user values(1,'rose')";
jt.update(sql);
}
}
写入数据库.png
spring整合JDBC*连接池&JDBC模板&Dao配置到spring容器
jdbc实现增删改查
//使用jdbc实现增删改查
public class UserDaoImpl implements UserDao {
private JdbcTemplate jt;
@Override
public void save(User u) {
String sql = "insert into t_user values(null,?)";
jt.update(sql, u.getName());
}
@Override
public void delete(Integer id) {
String sql = "delete from t_user where id = ?";
jt.update(sql, id);
}
@Override
public void update(User u) {
String sql =" update t_user set name = ? where id = ?";
jt.update(sql, u.getName(),u.getId());
}
@Override
public User getById(Integer id){
String sql =" select * from t_user where id = ?";
return jt.queryForObject(sql, new RowMapper<User>(){
@Override
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}},id);
}
@Override
public int getTotalCount() {
String sql =" select count(*) from t_user ";
Integer queryForObject = jt.queryForObject(sql, Integer.class);
return queryForObject;
}
@Override
public List<User> getAll() {
String sql =" select * from t_user ";
List<User> list = jt.query(sql, new RowMapper<User>(){
@Override
public User mapRow(ResultSet rs, int arg1) throws SQLException {
User u = new User();
u.setId(rs.getInt("id"));
u.setName(rs.getString("name"));
return u;
}});
return list;
}
public void setJt(JdbcTemplate jt) {
this.jt = jt;
}
配置applicationContext.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd ">
<!-- 1.将连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="jdbcUrl" value="jdbc:mysql:///hibernate"></property>
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="user" value="root"></property>
<property name="password" value=""></property>
</bean>
<!-- 2.将JDBCTemplate放入spring容器 -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 3.将UserDao放入spring容器 -->
<bean name="userDao" class="cn.lc.a_jdbctemplate.UserDaoImpl">
<property name="jt" ref="jdbcTemplate"></property>
</bean>
</beans>
测试
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration("classpath:applicationContext.xml")
public class Demo {
@Resource(name="userDao")
private UserDao ud;
@Test
public void fun2() throws Exception{
User u = new User();
u.setName("tom");
ud.save(u);
}
@Test
public void fun3() throws Exception{
User u = new User();
u.setId(2);
u.setName("shangsan");
ud.update(u);
}
//结果成功
结果.png
spring整合jdbc读取properties配置
配置db.properties文件
//spring读取文件最好加一个前缀
jdbc.jdbcUrl=jdbc:mysql:///hibernate
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=
配置applicationContext.xml文件
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd ">
<!-- 指定spring读取db.properties文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 1.将连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="jdbcUrl" value="${jdbc.jdbcUrl}"></property>
<property name="driverClass" value="${jdbc.driverClass}"></property>
<property name="user" value="${jdbc.user}"></property>
<property name="password" value="${jdbc.password}"></property>
</bean>
<!-- 2.将JDBCTemplate放入spring容器 -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>
</bean>
<!-- 3.将UserDao放入spring容器 -->
<bean name="userDao" class="cn.lc.a_jdbctemplate.UserDaoImpl">
<property name="jt" ref="jdbcTemplate"></property>
</bean>
</beans>
