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[java]代码库

package com.ruide.db;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.List;

import com.ruide.mapper.IMapper;

public class DBManager {
	private Connection getConn() throws SQLException {
		return DBHelper.cpds.getConnection();
	}
	
	public int executeUpdate(String sql,Object[] params){
		Connection conn=null;
		PreparedStatement pst=null;
		try {
			conn=getConn();
			pst=conn.prepareStatement(sql);
			if(params!=null){
				for(int i=0;i<params.length;i++){
					pst.setObject(i+1, params[i]);
				}
			}
			int i=pst.executeUpdate();
			return i;
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return -1;
	}
	public List executeQuery(String sql,IMapper mapper,Object params[]){
		Connection conn=null;
		PreparedStatement pst=null;
		ResultSet rst=null;
		try {
			conn =getConn();
			pst =conn.prepareStatement(sql);
			if(params!=null){
				for(int i=0;i<params.length;i++){
					pst.setObject(i+1, params[i]);
				}
			}
			rst=pst.executeQuery();
			return mapper.map(rst);
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return null;
	}
}

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