达梦数据库使用

达梦数据库使用

前言

本文主要是【达梦数据库】——达梦数据库简单使用的文章，如果有什么需要改进的地方还请大佬指出⛺️

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本实验主要是达梦数据库增删改查的简单案例

• 实验环境采用JDK17，使用springboot+mybatis整合达梦数据库

1.在pom.xml中导入对应的依赖

        
       <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>3.0.2version>
        dependency>

        <dependency>
            <groupId>com.damenggroupId>
            <artifactId>DmJdbcDriver18artifactId>
            <version>8.1.1.193version>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-jdbcartifactId>
        dependency>

        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        
        <dependency>
            <groupId>org.projectlombokgroupId>
            <artifactId>lombokartifactId>
            <optional>trueoptional>
        dependency>

2.配置application.yml文件

spring:
    datasource:
        username: SYSDBA  #模式名
        password: SYSDBA  #密码
        url: jdbc:dm://localhost:5236 #达梦数据库默认端口为5236，不用更改
        driver-class-name: dm.jdbc.driver.DmDriver
server:
    port: 8080 #tomcat端口使用8080

3.实体类:Student

package com.dameng.pojo;

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class Student {
    private int id;
    private String name;
    private int age;

}

4.接口类StudentMapper

package com.dameng.mapper;

import com.dameng.pojo.Student;
import org.apache.ibatis.annotations.*;

import java.util.List;

@Mapper
public interface StudentMapper {
    @Select("select * FROM \"student\"")
    List<Student> findAll();

    @Insert("insert INTO SYSDBA.\"student\" VALUES(#{name},#{age})")
    int insertStudent(Student student);

    @Delete("delete FROM SYSDBA.\"student\" WHERE \"student\".\"id\" == #{id}")
    int deleteStudent(int id);

    @Update("update SYSDBA.\"student\" SET SYSDBA.\"student\".\"age\" = #{age},SYSDBA.\"student\".\"name\"=#{name} WHERE \"student\".\"id\" = #{id}")
    int updateStudent(Student student);

    @Select("select * FROM SYSDBA.\"student\" WHERE \"student\".\"id\"=#{id}")
    Student findStudentById(int id);
}

测试类：DaMengApplicationTests

package com.dameng;

import com.dameng.mapper.StudentMapper;
import com.dameng.pojo.Student;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.List;

@SpringBootTest
class DaMengApplicationTests {

    //注入接口对象
    @Autowired
    private StudentMapper studentMapper;

    @Test
    void contextLoads() {
        //查询所有学生
        List<Student> list = studentMapper.findAll();
        for (Student i:list){
            System.out.println(i.toString());
        }
        //根据ID查询学生
        Student student = studentMapper.findStudentById(1);
        System.out.println(student.toString());
        //添加学生
        Student student1 = new Student(0,"赵哈哈",18);
        int i = studentMapper.insertStudent(student1);
        System.out.println("i:"+i);
        //修改学生信息
        Student student2 = new Student(4,"赵七",20);
        int i1 = studentMapper.updateStudent(student2);
        System.out.println("i1:"+i1);
        //根据ID删除学生
        int i2 = studentMapper.deleteStudent(5);
        System.out.println("i2:"+i2);
    }

}

达梦数据库增删改查语法

• 最后操作完数据库之后记得commit；不然不会立即执行。

insert INTO SYSDBA."student" VALUES('王五',20);
select * FROM SYSDBA."student";
delete FROM SYSDBA."student" WHERE "student"."id" = 3;
update SYSDBA."student" SET SYSDBA."student"."age" = 10,SYSDBA."student"."name"='张强' WHERE "student"."id" = 1;
select * FROM SYSDBA."student" WHERE "student"."id"=2;
commit;

总结

• 达梦数据库是我国的一款优秀国产数据库，但是其自适应的DM管理工具确实没有Navicat等工具简洁明了，方便好用，但支持国产，相信达梦数据库，国产数据库会变得越来越好。

文章末尾