Java mybatis@Select带有sql关键字的静态工厂编译时出错？

当我使用@Select时，它是ibatis的注释，代码如下：

@Select({"SELECT ", selectField, " FROM ", table, "WHERE finished = #{finished}"})
 List<ToDo> listToDoByFinished(@Param("finished") Integer finished);

SqlFactory

中定义的sql关键字：

package me.freezehome.blog.factory;

public  class SqlFactory {
    private SqlFactory(){}
    public static final  String SELECT = " SELECT ";
    public static final  String INSERT = " INSERT ";
    public static final  String UPDATE = " UPDATE ";
    public static final  String DELETE = " DELETE ";

    public static final  String WHERE = " WHERE ";
    public static final  String FROM = " FROM ";
    public static final  String AND = " AND ";
    public static final  String OR = " OR ";
    public static final  String IN = " IN ";
    public static final  String INTO = " INTO ";
    public static final  String VALUES = "VALUES";
    public static final  String EQUAL = " = ";


}

接口中定义的其他：

package me.freezehome.blog.dao;

import me.freezehome.blog.driver.MyInLanguageDriver;
import me.freezehome.blog.model.ToDo;
import org.apache.ibatis.annotations.*;

import java.util.List;

import static me.freezehome.blog.config.StringConfig.strSeparator;
import static me.freezehome.blog.factory.SqlFactory.*;

public interface ToDoDAO {
    String table = "todo";
    String id = "id";
    String title = "title";
    String content = "content";
    String finished = "finished";

    String selectField = id + strSeparator + title + strSeparator + content + strSeparator + finished;
    String insertField = title + strSeparator + content;
}

其他信息：

• mybatis 3.4.1
• mybatis spring 1.3.0
• 春季4.3.3
• mavne 3.3.9
• java“1.8.0_111” Java（TM）SE运行时环境（build 1.8.0_111-b14） Java HotSpot（TM）64位服务器虚拟机（构建25.111-b14，混合模式）

---

我想您已经导入了静态SqlFactory。*

---

在ToDoDAO接口中，所有字符串都应该是静态的，因为注释需要常量参数。

我已经在我的小应用程序上尝试了这段代码。因此，Java编译器将尝试引用与常量同名的方法参数

在这种情况下，Java编译器将尝试引用方法参数（

finished

定义为

Integer

），而不是

String finished=“finished”（常数）。因此，在编译时发生类型转换错误

我不知道它是否是Java编译器上的规范

您可能可以通过将常量名称转换为大写来解决此问题
 为什么？SqlFactory的变量都是静态的final。ToDoDAO接口的变量不是但必须是，但为什么我不能导入静态SqlFactory。*？不，你必须
导入静态me.freezehome.blog.factory.SqlFactory.
才能编译，只是告诉你，因为它不在你的代码段中。对不起，没有粘贴所有代码是我的错。我有更新代码是的，我用大写字母解决它，但我不能理解。
package me.freezehome.blog.factory;

public  class SqlFactory {
    private SqlFactory(){}
    public static final  String SELECT = " SELECT ";
    public static final  String INSERT = " INSERT ";
    public static final  String UPDATE = " UPDATE ";
    public static final  String DELETE = " DELETE ";

    public static final  String WHERE = " WHERE ";
    public static final  String FROM = " FROM ";
    public static final  String AND = " AND ";
    public static final  String OR = " OR ";
    public static final  String IN = " IN ";
    public static final  String INTO = " INTO ";
    public static final  String VALUES = "VALUES";
    public static final  String EQUAL = " = ";


}

package me.freezehome.blog.dao;

import me.freezehome.blog.driver.MyInLanguageDriver;
import me.freezehome.blog.model.ToDo;
import org.apache.ibatis.annotations.*;

import java.util.List;

import static me.freezehome.blog.config.StringConfig.strSeparator;
import static me.freezehome.blog.factory.SqlFactory.*;

public interface ToDoDAO {
    String table = "todo";
    String id = "id";
    String title = "title";
    String content = "content";
    String finished = "finished";

    String selectField = id + strSeparator + title + strSeparator + content + strSeparator + finished;
    String insertField = title + strSeparator + content;
}