50 lines
1.7 KiB
Java
50 lines
1.7 KiB
Java
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/**
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* Copyright © 2012-2014 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
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*/
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package com.nis.persistence.dialect;
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/**
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* Dialect for HSQLDB
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*
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* @author poplar.yfyang
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* @version 1.0 2010-10-10 下午12:31
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* @since JDK 1.5
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*/
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public class HSQLDialect implements Dialect {
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@Override
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public boolean supportsLimit() {
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return true;
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}
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@Override
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public String getLimitString(String sql, int offset, int limit) {
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return getLimitString(sql, offset, Integer.toString(offset),
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Integer.toString(limit));
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}
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/**
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* 将sql变成分页sql语句,提供将offset及limit使用占位符号(placeholder)替换.
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* <pre>
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* 如mysql
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* dialect.getLimitString("select * from user", 12, ":offset",0,":limit") 将返回
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* select * from user limit :offset,:limit
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* </pre>
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*
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* @param sql 实际SQL语句
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* @param offset 分页开始纪录条数
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* @param offsetPlaceholder 分页开始纪录条数－占位符号
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* @param limitPlaceholder 分页纪录条数占位符号
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* @return 包含占位符的分页sql
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*/
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public String getLimitString(String sql, int offset, String offsetPlaceholder, String limitPlaceholder) {
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boolean hasOffset = offset > 0;
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return
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new StringBuffer(sql.length() + 10)
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.append(sql)
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.insert(sql.toLowerCase().indexOf("select") + 6, hasOffset ? " limit " + offsetPlaceholder + " " + limitPlaceholder : " top " + limitPlaceholder)
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.toString();
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}
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}
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