SqlServer的一个分页工具类-优快云博客

本文介绍了一个针对SqlServer设计的分页工具类，该工具类能够根据输入的参数生成SQL语句实现分页查询，同时提供了直接返回ResultSet对象的功能。

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SqlServer的一个分页工具类，主要功能有为据传入的参数生成sql语句，或者根据传入的参数直接返回一个ResultSet对象。

/**
 * 
 */
package com.woxiaoe.ework.util;

import java.sql.CallableStatement;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.HashMap;
import java.util.Map;

import javax.sql.DataSource;

import org.apache.log4j.Logger;
import org.gdb.common.DataSourceFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.jdbc.core.CallableStatementCallback;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceUtils;

/**
 * 分页工具类
 * @author 小e
 *
 * 2010-1-1 下午07:46:04
 */
public class PaginationUtil {
	
	private Map<ResultSet,Connection> currentConn = new HashMap<ResultSet, Connection>();

	
	
	public String getPaginationSql(int start,int limit,String tableName,String fields,String filter,String orderBy){
		String sql = "SELECT TOP " + limit +" * FROM "
		+ "( "
        + "SELECT ROW_NUMBER() OVER (ORDER BY " + orderBy + ") AS RowNumber," + fields +" FROM "  + tableName +
        		((filter != null)?" where " + filter:"")
        + ") A "
        + "	WHERE RowNumber > " + start ;
		return sql;
	}
	
	public ResultSet query(int start,int limit,String tableName,String fields,String filter,String orderBy){
		Connection conn = DataSourceUtils.getConnection(DataSourceFactory.getDataSource());
		PreparedStatement pstmt;
		ResultSet rs = null;
		try {
			pstmt = conn.prepareStatement(getPaginationSql(start,limit,tableName,fields,filter,orderBy));
			rs = pstmt.executeQuery();
			currentConn.put(rs, conn);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return rs;
	}

	public void releaseConn(ResultSet rs){
		Connection conn = currentConn.get(rs);
		currentConn.remove(rs);
		DataSourceUtils.releaseConnection(conn, DataSourceFactory.getDataSource());
	}
}