Spring+JDBC实例

1. Customer 表

在这个例子中，我们使用的是MySQL数据库。
CREATE TABLE customer (
CUST_ID int(10) unsigned NOT NULL AUTO_INCREMENT,
NAME varchar(100) NOT NULL,
AGE int(10) unsigned NOT NULL,
PRIMARY KEY (CUST_ID)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

2. Customer模型

添加一个客户模型用来存储用户的数据。
package com.yiibai.customer.model;

import java.sql.Timestamp;

public class Customer
{
int custId;
String name;
int age;
//getter and setter methods

}

4. 数据访问对象 (DAO) 模式

Customer Dao 接口.

package com.yiibai.customer.dao;

import com.yiibai.customer.model.Customer;

public interface CustomerDAO
{
public void insert(Customer customer);
public Customer findByCustomerId(int custId);
}
客户的DAO实现，使用 JDBC 发出简单的 insert 和 select SQL语句。
package com.yiibai.customer.dao.impl;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.sql.DataSource;
import com.yiibai.customer.dao.CustomerDAO;
import com.yiibai.customer.model.Customer;

public class JdbcCustomerDAO implements CustomerDAO
{
private DataSource dataSource;

public void setDataSource(DataSource dataSource) {
    this.dataSource = dataSource;
}

public void insert(Customer customer){
    
    String sql = "INSERT INTO CUSTOMER " +
            "(CUST_ID, NAME, AGE) VALUES (?, ?, ?)";
    Connection conn = null;
    
    try {
        conn = dataSource.getConnection();
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setInt(1, customer.getCustId());
        ps.setString(2, customer.getName());
        ps.setInt(3, customer.getAge());
        ps.executeUpdate();
        ps.close();
        
    } catch (SQLException e) {
        throw new RuntimeException(e);
        
    } finally {
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {}
        }
    }
}

public Customer findByCustomerId(int custId){
    
    String sql = "SELECT * FROM CUSTOMER WHERE CUST_ID = ?";
    
    Connection conn = null;
    
    try {
        conn = dataSource.getConnection();
        PreparedStatement ps = conn.prepareStatement(sql);
        ps.setInt(1, custId);
        Customer customer = null;
        ResultSet rs = ps.executeQuery();
        if (rs.next()) {
            customer = new Customer(
                rs.getInt("CUST_ID"),
                rs.getString("NAME"), 
                rs.getInt("Age")
            );
        }
        rs.close();
        ps.close();
        return customer;
    } catch (SQLException e) {
        throw new RuntimeException(e);
    } finally {
        if (conn != null) {
            try {
            conn.close();
            } catch (SQLException e) {}
        }
    }
}

}

5. Spring bean配置

创建 customerDAO 和数据源在 Spring bean 配置文件中。
File : Spring-Customer.xml

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

File : Spring-Datasource.xml

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

File : Spring-Module.xml

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">