达梦数据库集成mybatis-plus

先总结

库名，表名和字段名尽量大写。小写必须要使用双引号，不然会报各种问题，包括【语法解析错误】，【无效的列名】
如果列名必须小写，那么要自己写mapper.xml。mybatis-plus在操作insert的时候会报【dm.jdbc.driver.DMException: 无效的列】，加了双引号也不行。参见我另外一篇文章mybatis-plus insert无效的列。

以下是部分代码

包引用

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.2</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.dmdba.demo</groupId><artifactId>dmdbaDemo</artifactId><version>0.0.1-SNAPSHOT</version><name>dmdbaDemo</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>com.dameng</groupId><artifactId>DmJdbcDriver18</artifactId><version>8.1.3.62</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.5.3.2</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><excludes><exclude><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></exclude></excludes></configuration></plugin></plugins></build></project>

表结构

CREATE TABLE "test"."user"
(
"ID" INTEGER IDENTITY(1, 1) NOT NULL,
"USERNAME" VARCHAR2(50),
"login_name" VARCHAR2(50),
UNIQUE("ID")) STORAGE(ON "MAIN", CLUSTERBTR) ;

mapper

错误案例：login_name没有带双引号，不带的话就变大写了，报错【无效的列名[LOGIN_NAME]】。当然，如果列名本身是大写的就不用带双引号了
另外，库名和表名也要带双引号，不然就大写，不然报【语法分析出错】

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<!--命名空间  会映射到 接口-->
<mapper namespace="com.dmdba.demo.dmdbademo.mappers.UserMapper"><insert id="ins">insert into "test"."user" ("login_name")values(#{loginName})</insert>
</mapper>

entity

注意，库名和表名需要带双引号，不想带的话要大写
如果小写而没有带双引号则报【语法分析出错】

@Data
@TableName("\"test\".\"user\"")
public class User {@TableId(type = IdType.AUTO, value = "ID")private Integer id;@TableField("USERNAME")private String username;private String loginName;
}