commondao.java

用java编的用到

package djr.dao;

import java.sql.*;

public class CommonDAO
{

	public ResultSet execSelect(String sql, Connection conn)
	{
		Statement stmt = null;
		try
		{
			stmt = conn.createStatement();
			return stmt.executeQuery(sql);

		}
		catch (SQLException e)
		{
			e.printStackTrace();
		}

		return null;
	}

	public int execUpdate(String sql, Connection conn)
	{
		Statement stmt = null;

		try
		{
			stmt = conn.createStatement();
			return stmt.executeUpdate(sql);

		}
		catch (SQLException e)
		{
			e.printStackTrace();
		}
		finally
		{
			close(stmt, null);
		}

		return -1;
	}

	public void close(Statement stmt, ResultSet rs)
	{
		try
		{
			if (stmt != null)
			{

				stmt.close();
			}
			if (rs != null)
			{
				rs.close();
			}
		}
		catch (SQLException e)
		{
			e.printStackTrace();
		}
	}
}