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PostgreSqlDialect.java
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PostgreSqlDialect.java
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/*
* The MIT License (MIT)
*
* Copyright (c) 2014-2021 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.helper;
import com.github.pagehelper.dialect.AbstractHelperDialect;
import com.github.pagehelper.util.MetaObjectUtil;
import org.apache.ibatis.cache.CacheKey;
import com.github.pagehelper.Page;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.reflection.MetaObject;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* PostgreSQL 方言.
*
* @author liym
* @since 2021-02-06 19:27 新建
*/
public class PostgreSqlDialect extends AbstractHelperDialect {
@Override
public Object processPageParameter(MappedStatement ms, Map<String, Object> paramMap, Page page, BoundSql boundSql, CacheKey pageKey) {
paramMap.put(PAGEPARAMETER_SECOND, page.getPageSize());
paramMap.put(PAGEPARAMETER_FIRST, page.getStartRow());
//处理pageKey
pageKey.update(page.getPageSize());
pageKey.update(page.getStartRow());
//处理参数配置
if (boundSql.getParameterMappings() != null) {
List<ParameterMapping> newParameterMappings = new ArrayList<ParameterMapping>(boundSql.getParameterMappings());
if (page.getStartRow() == 0) {
newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), PAGEPARAMETER_SECOND, int.class).build());
} else {
newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), PAGEPARAMETER_SECOND, int.class).build());
newParameterMappings.add(new ParameterMapping.Builder(ms.getConfiguration(), PAGEPARAMETER_FIRST, long.class).build());
}
MetaObject metaObject = MetaObjectUtil.forObject(boundSql);
metaObject.setValue("parameterMappings", newParameterMappings);
}
return paramMap;
}
/**
* 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, Page page, CacheKey pageKey) {
StringBuilder sqlStr = new StringBuilder(sql.length() + 17);
sqlStr.append(sql);
if (page.getStartRow() == 0) {
sqlStr.append(" LIMIT ?");
} else {
sqlStr.append(" LIMIT ? OFFSET ?");
}
return sqlStr.toString();
}
}