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PostgreSqlRowBoundsDialect.java
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PostgreSqlRowBoundsDialect.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2011-2021 abel533@gmail.com
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package com.github.pagehelper.dialect.rowbounds;
import org.apache.ibatis.cache.CacheKey;
import org.apache.ibatis.session.RowBounds;
import com.github.pagehelper.dialect.AbstractRowBoundsDialect;
/**
* PostgreSQL 基于 RowBounds 的分页.
*
* @author liym
* @since 2021-02-06 19:31 新建
*/
public class PostgreSqlRowBoundsDialect extends AbstractRowBoundsDialect {
/**
* 构建 <a href="https://www.postgresql.org/docs/current/queries-limit.html">PostgreSQL</a>分页查询语句
*/
@Override
public String getPageSql(String sql, RowBounds rowBounds, CacheKey pageKey) {
StringBuilder sqlStr = new StringBuilder(sql.length() + 17);
sqlStr.append(sql);
if (rowBounds.getOffset() == 0) {
sqlStr.append(" LIMIT ");
sqlStr.append(rowBounds.getLimit());
} else {
sqlStr.append(" LIMIT ");
sqlStr.append(rowBounds.getLimit());
sqlStr.append(" OFFSET ");
sqlStr.append(rowBounds.getOffset());
pageKey.update(rowBounds.getOffset());
}
pageKey.update(rowBounds.getLimit());
return sqlStr.toString();
}
}