derby数据库windows自带的客户端

本示例演示用windows自带的ij来操作derby数据库，包括建库，建表，插入数据，查询数据

首先要配置环境变量：

其次打开cmd输入如下图所示的命令：

java代码如下：

package com.adapter;

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

/**
 * @author Abraham Qin
 * @since 2019/1/19
 */
public class DerbyTest {
    public static void main(String[] args) throws Exception{
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        Connection connection = DriverManager.getConnection("jdbc:derby:mydb;create=true");
        Statement statement = connection.createStatement();
        statement.execute("drop table Greetings");
        int update = statement.executeUpdate("CREATE TABLE Greetings (Message CHAR(40))");
        statement.executeUpdate("INSERT INTO Greetings VALUES('hello')");
        System.out.println(update);
        ResultSet resultSet = statement.executeQuery("select * from Greetings");
        while(resultSet.next()){
            System.out.println(resultSet.getString("Message"));
        }

    }
}

注意上面的代码必须引入derby.jar这个jar包