JDBC_Druid

package Utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
import java.io.IOException;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;

public class JDBCUtils {
    private static DataSource ds;
    static {
        try {
            //加载配置文件
            Properties pro=new Properties();
            pro.load(JDBCUtils.class.getClassLoader().getResourceAsStream("druid.properties"));
            //获取连接池对象
            ds = DruidDataSourceFactory.createDataSource(pro);
        } catch (IOException e) {
            e.printStackTrace();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    //创建获取数据库连接对象的方法
    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }
    //释放资源的方法
    public static void close(Statement stmt,Connection conn){
        if (stmt!=null){
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

    }
    public static void close(ResultSet rs ,Statement stmt, Connection conn){
        if (rs!=null){
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (stmt!=null){
            try {
                stmt.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn!=null){
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
    public static DataSource getDataSource(){
        return ds;
    }
}

package druid;

import Utils.JDBCUtils;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class DruidDemo2 {
    public static void main(String[] args) {
        Connection conn=null;
        PreparedStatement pstmt=null;
        try {
            //加载配置文件
            //获取连接对象
            conn=JDBCUtils.getConnection();
            String sql="insert into account values(null,?,?)";
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1,"wangwu");
            pstmt.setDouble(2,1000);
            int count = pstmt.executeUpdate();
            System.out.println(count);
        } catch (SQLException e) {
            e.printStackTrace();
        }finally {
            //释放资源
            JDBCUtils.close(pstmt,conn);
        }


    }
}