Mybatis 手动插入PK

如何解决Mybatis 手动插入PK

我正在尝试使用指定的 PK 将数据单独插入到表中。手动分配PK。

XML 文件

<insert id = "insertStd" parameterType = "com.org.springboot.dao.StudentEntity" useGeneratedKeys = "false" keyProperty = "insertStd.id",keyColumn = "id">
      INSERT INTO STUDENT (ID,NAME,BRANCH,PERCENTAGE,PHONE,EMAIL ) 
      VALUES (ID=#{insertStd.id},NAME=#{insertStd.name},BRANCH=#{insertStd.branch},PERCENTAGE=#{insertStd.percentage},PHONE=#{insertStd.phone},EMAIL =#{insertStd.email});

   </insert>

服务调用方式

public boolean saveStudent(Student student){
    LOGGER.info("Student object save");
    int savedId= studentMapper.insertStd(student);
}

日志文件

org.springframework.jdbc.badsqlgrammarexception
### Error updating database Causes: cause org.postgresql.util.psqlexception error column id does not exist
HINT: There is a column named "id" in the table "student" but it can't be referenced from this part of the query. 
Position 200
### Error may exist in file [c:\.....\StudentMapper.xml]
### Error may involve in com.org.springboot.dao.StudentMapper.insertStd-InLine
### The error occurred while setting parameters
### sql INSERT INTO STUDENT (ID,EMAIL ) 
  VALUES (ID=?,NAME=?,BRANCH=?,PERCENTAGE=?,PHONE=?,EMAIL=?);
### cause org.postgresql.util.psqlexception ERROR column "id" doesn't exist. //It did worked with JPA id assigned manually.
### There is a column named "ID" in the table "STUDENT",Bbut it cannot be referenced from the part of the query. 

解决方法

格式错误的 INSERT 语句。 VALUES 子句不应包含列名。

此外，由于没有主要的自动生成，您可以删除所有其他属性。只需离开映射器 id。

注意：如果要手动分配PK值，需要确保表中没有列的GENERATED ALWAYS子句。如果是这种情况，表格将忽略您提供的值，并使用自己的规则生成 PK。

使用：

<insert id="insertStd">
  INSERT INTO STUDENT (ID,NAME,BRANCH,PERCENTAGE,PHONE,EMAIL)
  VALUES (
    #{insertStd.id},#{insertStd.name},#{insertStd.branch},#{insertStd.percentage},#{insertStd.phone},#{insertStd.email}
  );
</insert>

您的错误很容易重现：

create table t (a int,b varchar(10));

insert into t (a,b) values (123,'ABC'); -- succeeds
        
insert into t (a,b) values (a=123,b='ABC'); -- fails!

错误：“a”列不存在

参见Fiddle。