mybatis写接口 简单的实现等
mybatis书写自定义的接口
实现伪删除，排序置顶等接口
使用的mybatis是
<dependency>
<groupId>tk.mybatis</groupId>
<artifactId>mapper</artifactId>
<version>3.4.0</version>
</dependency>
1、定义接口
package tk.mybatis.mapper.common.base.delete;
import org.apache.ibatis.annotations.DeleteProvider;
import tk.mybatis.mapper.provider.base.BaseDeleteProvider;
/**
* @author xiebq 2018/12/24
*/
public interface LogicDeleteByPrimaryKey<T> {
/**
* 根据主键字段进行删除，方法参数必须包含完整的主键属性
*
* @param key
* @return
*/
@DeleteProvider(type = BaseDeleteProvider.class, method = "dynamicSQL")
int logicDeleteByPrimaryKey(Object key);
}
2、集成接口
public interface BaseDeleteMapper<T> extends
DeleteMapper<T>,
LogicDeleteByPrimaryKey<T>,
DeleteByPrimaryKeyMapper<T> {
}
3、实现接口 在BaseDeleteProvider 类中实现接口的方法
/**
* 伪删除的实现
*
* @param ms
*/
public String logicDeleteByPrimaryKey(MappedStatement ms) {
final Class<?> entityClass = getEntityClass(ms);
StringBuilder sql = new StringBuilder();
sql.append(SqlHelper.updateTable(entityClass, tableName(entityClass)));
sql.append(" set is_delete = 1 ");
Date date = new Date();
SimpleDateFormat sdf2= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sql.append(" ,updated = '"+sdf2.format(date) +"' ");
sql.append(SqlHelper.wherePKColumns(entityClass));
return sql.toString();
}
4、使用接口
@Mapper
public interface UserDao extends MyMapper<User> {}
public Boolean logicDelete(Integer id) {
userDao.logicDeleteByPrimaryKey(id);
return true;
}
tk mybatis
通过拼接sql的语句实现，显示接口定义，实现类拼接sql语句，然后实现语句
在mybatis拼接sql语句中，提供多个sql语句拼接的Provider
