标签：man 没有 oid setname root roo mod return ali
问题信息:
如果表名是数据库关键字怎么办？
正常来说，如果是我们自己写sql的话，给表名加反引号即可解决问题。
但是由于我们使用MyBatisPlus，相关的sql基本上都是封装并自动生成的。如果是这种场景，我们就需要修改对应的实体，举例说明，如下代码:
import com.baomidou.mybatisplus.enums.IdType; import com.baomidou.mybatisplus.annotations.TableId; import com.baomidou.mybatisplus.activerecord.Model; import java.io.Serializable; public class Group extends Model<Group> { private static final long serialVersionUID = 1L; /** * 组ID */ @TableId(value = "id", type = IdType.AUTO) private Integer id; /** * 组名 */ private String name; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override protected Serializable pkVal() { return this.id; } @Override public String toString() { return "Group{" + "id=" + id + ", name=" + name + "}"; } }
用上述代码的自动生成肯定会有问题，以单条数据查询为例，默认是 select id,name from group where id = 1，又因为group属于关键字，接下来会出现如下错误信息:
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘group WHERE id=1‘ at line 1 ; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘group WHERE id=1‘ at line 1] with root cause com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘group WHERE id=1‘ at line 1
这种错误信息，很容易识别，一看就是sql写的有问题。但实际上sql并没有问题，只不过是因为关键字冲突导致sql错误。
那么如何解决这个问题呢？
答案是只需加一个@TableName注解即可解决该问题。修改后的实体代码如下:
import com.baomidou.mybatisplus.enums.IdType; import com.baomidou.mybatisplus.annotations.TableId; import com.baomidou.mybatisplus.annotations.TableName; import com.baomidou.mybatisplus.activerecord.Model; import java.io.Serializable; @TableName("`group`") public class Group extends Model<Group> { private static final long serialVersionUID = 1L; /** * 组ID */ @TableId(value = "id", type = IdType.AUTO) private Integer id; /** * 组名 */ private String name; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override protected Serializable pkVal() { return this.id; } @Override public String toString() { return "Group{" + "id=" + id + ", name=" + name + "}"; } }
记一次MyBatisPlus问题(如果表名是数据库关键字怎么办)
标签：man 没有 oid setname root roo mod return ali
原文地址：https://www.cnblogs.com/youcong/p/11440653.html
