关系型数据库(derby)

概述

用 Java 编写的关系数据库,可以两种模式运行：嵌入式或客户端服务器。遵循SQL标准并兼容JDBC接口。

maven依赖

xml 复制代码

        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <version>10.11.1.1</version>
        </dependency>

示例

内存模式

java 复制代码

    @Test
    void contextLoads() throws ClassNotFoundException, SQLException {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        Connection connection = DriverManager.getConnection("jdbc:derby:memory:test;create=true");
        Statement statement = connection.createStatement();
        //创建表
        statement.execute("create table tb_demo(id integer not null, name varchar(50))");
        //插入数据
        statement.execute("insert into tb_demo(id,name) values (1,'bob')");
        statement.execute("insert into tb_demo(id,name) values (2,'pop')");
        //查询数据
        ResultSet resultSet = statement.executeQuery("select * from tb_demo");
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id: " + id + "   name: " + name);
        }
    }

文件模式

java 复制代码

    @Test
    void contextLoads1() throws ClassNotFoundException, SQLException {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        Connection connection = DriverManager.getConnection("jdbc:derby:E:\\db\\derby.db;create=true");
        Statement statement = connection.createStatement();
        //创建表
        statement.execute("create table tb_demo(id integer not null, name varchar(50))");
        //插入数据
        statement.execute("insert into tb_demo(id,name) values (1,'bob')");
        statement.execute("insert into tb_demo(id,name) values (2,'pop')");
        //查询数据
        ResultSet resultSet = statement.executeQuery("select * from tb_demo");
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id: " + id + "   name: " + name);
        }
    }

客户端服务器模式(需要先下载、安装、启动Derby网络服务器)

java 复制代码

    @Test
    void contextLoads1() throws ClassNotFoundException, SQLException {
        Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
        Connection connection = DriverManager.getConnection("jdbc:derby://127.0.0.1:1527/testdb;create=true,"userName", "******");
        Statement statement = connection.createStatement();
        //创建表
        statement.execute("create table tb_demo(id integer not null, name varchar(50))");
        //插入数据
        statement.execute("insert into tb_demo(id,name) values (1,'bob')");
        statement.execute("insert into tb_demo(id,name) values (2,'pop')");
        //查询数据
        ResultSet resultSet = statement.executeQuery("select * from tb_demo");
        while (resultSet.next()) {
            int id = resultSet.getInt("id");
            String name = resultSet.getString("name");
            System.out.println("id: " + id + "   name: " + name);
        }
    }

可参考文档

官网