阿里云链接池

JDBCUtils工具类

package com.zdy.utils;

import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;
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 {
            Properties ps = new Properties();
            ps.load(JDBCutils.class.getClassLoader().getResourceAsStream("druid.properties"));
            ds = DruidDataSourceFactory.createDataSource(ps);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static Connection getConnection() throws SQLException {
        return ds.getConnection();
    }

    public static void close(Statement sta, Connection conn) {
        if (sta != null) {
            try {
                sta.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close(ResultSet res, Statement sta, Connection conn) {
        if (res != null) {
            try {
                res.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (sta != null) {
            try {
                sta.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static DataSource getData() {
        return ds;
    }
}
测试类

package com.zdy.jdbc;

import com.zdy.utils.JDBCutils;

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

public class druidDemo {
    public static void main(String[] args) {
        Connection conn = null;
        PreparedStatement pre = null;
        try {
            conn = JDBCutils.getConnection();
            pre = conn.prepareStatement("insert into emp values(1017,'张三',2,1005,'2019-04-03',5000,100,30)");
            pre.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            JDBCutils.close(pre, conn);
        }
    }
}