数据库分页
數(shù)據(jù)庫分頁(有時(shí)候忘了):
mysql:
public String getLimitString(String sql, Integer offset, Integer limit) {
sql = sql.trim();
sql+=" limit "+offset+","+limit;
? ? ? ? return sql;
}
sqlserver:
public String getLimitString(String sql, Integer offset, Integer limit) {
sql = sql.trim();
int i=sql.indexOf("order");
String sqlfinal=sql.substring(0, i);
String order=sql.substring(i);
? ? ? ? StringBuffer pageSql = new StringBuffer(sql.length() + 100);
? ? ? ? // 其實(shí)這里還是有一點(diǎn)問題的,就是排序問題,指定死了,有解決的提供一下,等復(fù)習(xí)到Hibernate看看Hibernat內(nèi)部是如何實(shí)現(xiàn)的。 ?
? ? ? ? pageSql.append("select * from(select a.*,row_number() over ("+order+") rownum from( "); ?
? ? ? ? pageSql.append(sqlfinal); ?
? ? ? ? pageSql.append(") a )b where rownum> " + offset + " and rownum <= " + (offset + limit)); ?
? ? ? return pageSql.toString(); ?
}
oracle:
public String getLimitString(String sql, Integer offset, Integer limit) {
sql = sql.trim();
StringBuffer pagingSelect = new StringBuffer(sql.length() + 100);
pagingSelect.append("select * from ( select row_.*, rownum rownum_ from ( ");
pagingSelect.append(sql);
pagingSelect.append(" ) row_ ) where rownum_ > ").append(offset).append(" and rownum_ <= ").append(offset + limit);
return pagingSelect.toString();
}
總結(jié)
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