Druid与DBUtils获取数据库

jdbc连接数据库

需要导入的第三方库2个

dbutils        druid

加载驱动 

利用druid创建数据库连接池

关闭流操作

package Test;

import com.alibaba.druid.pool.DruidDataSourceFactory;
import org.apache.commons.dbutils.DbUtils;
import org.junit.Test;
import javax.sql.DataSource;
import java.io.InputStream;
import java.sql.Connection;
import java.util.Properties;
import java.sql.Statement;
import java.sql.ResultSet;

public class DruidTest {
//    1、加载驱动
    //2、获取连接
    @Test
    public static Connection getConnection() throws Exception {
        Properties pros = new Properties();
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("druid.properties");//配置文件地址
        pros.load(is);
        DataSource source = DruidDataSourceFactory.createDataSource(pros);
        Connection connection = source.getConnection();
        System.out.println(connection);
        return connection;

    }
//    关闭流
    public static void closeResource1(Connection conn,Statement ps,ResultSet rs){
        DbUtils.closeQuietly(conn);
        DbUtils.closeQuietly(ps);
        DbUtils.closeQuietly(rs);
    }
}

         这是最基本的配置文件

url=jdbc:mysql:///test
username=root
password=abc123
driverClassName=com.mysql.jdbc.Driver

利用封装的dbutils实现增删改查操作

package Test;

import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanHandler;
import org.junit.Test;

import java.sql.Connection;

public class QueryRunnerTest {

//    增加一条数据
    @Test
    public void testInsert()  {
        Connection conn = null;
        try {
            QueryRunner runner = new QueryRunner();
            conn = DruidTest.getConnection();
            String sql = "insert into customers(name,email,birth)values(?,?,?)";
            int i = runner.update(conn, sql, "蔡徐坤", "caixukun@126.com", "1997-09-08");
            System.out.println(i);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            DruidTest.closeResource1(conn, null, null);
        }
    }
//    查询数据  有多种情况，具体情况具体分析
    @Test
    public void testQuery()  {
        Connection connection1 = null;
        try {
            QueryRunner runner = new QueryRunner();
            Connection connection = DruidTest.getConnection();
            String sql="select id,name,email,birth from customers where id = ?";
//        需求不一样，传入的东西不一样
            BeanHandler handler = new BeanHandler<>(Connection.class);
            connection1 = runner.query(connection, sql, handler, 18);
            System.out.println(connection1);
        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            DruidTest.closeResource1(connection1, null, null);
        }
    }
}