jdbc查询数据库基础

最新推荐文章于 2025-06-25 21:03:59 发布

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package chow;

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

import org.apache.commons.dbcp.BasicDataSource;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

/**
 * 基本的jdbc连接数据库
 * 
 * @author Thomas
 * @date 2013-07-18
 */

public class BasicJDBC {
	private static BasicDataSource dataSource;
	static {
		ApplicationContext context = new FileSystemXmlApplicationContext(
				"resource/applicationContext.xml");
		dataSource = (BasicDataSource) context.getBean("DataSource");
	}

	public static void main(String[] args) {
		Connection con = null;
		String sql = "select id from table1 where name = ?";
		try {
			// 装入数据库特定的驱动器
			Class.forName(dataSource.getDriverClassName());

			// 与数据库建立连接
			con = DriverManager.getConnection(dataSource.getUrl(), dataSource
					.getUsername(), dataSource.getPassword());

			// 使用Statement对象查询数据库
			PreparedStatement ps = con.prepareStatement(sql);
			int parameterIndex = 1;
			ps.setString(parameterIndex, "");

			//1. 执行查询，ResultSet保存查询结果
			ResultSet rs = ps.executeQuery();
			
			//2. 执行update,insert,delete语句，返回int，为影响的行数
			// ps.executeUpdate(); 
			
			while(rs.next()){
				rs.getString("columnName");
			}
			
			//最后必须关闭ResultSet和Connection
			rs.close();
			con.close();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

配置文件：applicationContext.xml文件

<?xml version="1.0" encoding="UTF-8"?>  
  
<beans xmlns="http://www.springframework.org/schema/beans"  
       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">  
    <!-- MySQL数据库配置 -->
    <bean id="DataSource" destroy-method="close" class="org.apache.commons.dbcp.BasicDataSource">  
        <property name="driverClassName" value="com.mysql.jdbc.Driver" />  
        <property name="url" value="jdbc:mysql://location:3306/Test" />  
        <property name="username" value="test" />  
        <property name="password" value="test" />  
    </bean>  
</beans>