/**
* Copyright (c) 2011-2020, hubin (jobob@qq.com).
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR EntityWrapperS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.baomidou.mybatisplus.mapper;
import com.baomidou.mybatisplus.toolkit.StringUtils;
/**
* <p>
* 条件查询构造器
* </p>
*
* @author hubin Caratacus
* @date 2016-11-7
*/
@SuppressWarnings({"rawtypes", "serial"})
public class Condition extends Wrapper {
/**
* 构建一个Empty条件构造 避免传递参数使用null
*/
public static final Condition EMPTY = Condition.create();
/**
* 获取实例
*/
@Deprecated
public static Condition instance() {
return Condition.create();
}
/**
* 获取实例
*/
public static Condition create() {
return new Condition();
}
/**
* SQL 片段
*/
@Override
public String getSqlSegment() {
if (SqlHelper.isEmptyOfWrapper(this)) {
return null;
}
/*
* 无条件
*/
String sqlWhere = sql.toString();
if (StringUtils.isEmpty(sqlWhere)) {
return null;
}
/*
* 根据当前实体判断是否需要将WHERE替换成 AND 增加实体不为空但所有属性为空的情况
*/
if (isWhere != null) {
sqlWhere = isWhere ? sqlWhere : sqlWhere.replaceFirst("WHERE", AND_OR);
}
return sqlWhere;
}
}