spring学习(九)—spring jdbcTemplate的使用简介

package jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import org.junit.Test;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DriverManagerDataSource;

public class JdbcTemplateDemo1 {

@Test
public void add() {
//使用spring的jdbcTemplate进行数据库的添加操作，不需要传统的jdbc方法要使用大量的冗余代码保证流程的正常进行
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql:///springlearn");
dataSource.setUsername("root");
dataSource.setPassword("root");

JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);

String sql = "insert into user values(?,?)";
int rows = jdbcTemplate.update(sql, "lucy", "250");
System.out.println(rows);
}

@Test
public void testJDBC() {
//使用传统的jdbc驱动进行数据库的查询操作，此种方法需要大量的冗余代码以保证数据库查询操作的正常进行。
Connection conn = null;
PreparedStatement psmt = null;
ResultSet rs = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection("jdbc:mysql:///springlearn",
"root", "vislecaina");
String sql = "select * from user where username=?";
psmt = conn.prepareStatement(sql);
psmt.setString(1, "lucy");
rs = psmt.executeQuery();
while(rs.next()){
String username = rs.getString("username");
String password = rs.getString("password");
User user = new User();
user.setUsername(username);
user.setPassword(password);
System.out.println("user:"+user);
}

} catch (SQLException e) {
// TODO 自动生成的 catch 块
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
} finally{
try{
rs.close();
psmt.close();
conn.close();
} catch(Exception e){
e.printStackTrace();
}
}
}

}

package jdbc;

public class User {

private String username;
private String password;

public String getUsername() {
return username;
}

public void setUsername(String username) {
this.username = username;
}

public String getPassword() {
return password;
}

public void setPassword(String password) {
this.password = password;
}

@Override
public String toString() {
return "User [username=" + username + ", password=" + password + "]";
}
}

package c3p0;

import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class TestService {

@Test
public void  testDemo(){
ApplicationContext context = new ClassPathXmlApplicationContext("bean.xml");
UserService userService = (UserService) context.getBean("userService");
userService.add();
}

}

package c3p0;

import org.springframework.jdbc.core.JdbcTemplate;

public class UserDao {

private JdbcTemplate jdbcTemplate;

public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
this.jdbcTemplate = jdbcTemplate;
}

public void add() {
String sql = "insert into user values(?,?)";
jdbcTemplate.update(sql, "lilei", "520");
}
}

package c3p0;

public class UserService {

private UserDao userDao;

public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}

public void add() {
userDao.add();
}

}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->

<!-- 配置c3p0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<!-- 注入属性值 -->
<property name="driverClass" value="com.mysql.jdbc.Driver"></property>
<property name="jdbcUrl" value="jdbc:mysql:///springlearn"></property>
<property name="user" value="root"></property>
<property name="password" value="root"></property>
</bean>

<bean id="userService" class="c3p0.UserService">
<property name="userDao" ref="userDao"></property>
</bean>
<bean id="userDao" class="c3p0.UserDao">
<property name="jdbcTemplate" ref="jdbcTemplate"></property>

</bean>

<!-- 创建jdbc模板对象 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource"></property>

</bean>
</beans>