execute_db.java

实现图书管理

package mypkg;

import java.sql.*;

public class Execute_DB extends Open_DB
{
	
	private Connection dbConn;
	private Statement stmt;
	private ResultSet rs;	
    private int errNum;    
    private String errDesc;
	
	public Execute_DB()
	{
		dbConn = super.getConn();
		stmt = null;
		rs = null;
		errNum = 0;
		errDesc = "";		
	}
	
	//执行sql 执行语句  
	public boolean exeSql(String strSql)
	{
		try
		{
   			stmt=dbConn.createStatement();
			stmt.executeUpdate(strSql);	
			stmt.close();	
			return true;            
		}
		catch(Exception ex)
		{
			
            this.errNum=-1;
            this.errDesc=ex.toString();
			return false;
		}	
	}
	
	 /**
    *@ 执行sql 查询语句
    */
    public ResultSet exeSqlQuery(String strSql)
	{
		
		try
		{
   			stmt=dbConn.createStatement(java.sql.ResultSet.TYPE_SCROLL_INSENSITIVE,java.sql.ResultSet.CONCUR_READ_ONLY);
			rs =stmt.executeQuery(strSql);			            
		}
		catch(Exception ex)
		{
			
            this.errNum=-1;
            this.errDesc=ex.toString();
			rs = null;
		}	
		return rs;
	}
		
		
	  /**
    *@ 取得错误号码
    */
    public int getErrNum()
    {
        return errNum;

    }
    /**
     * @ 取得错误信息
     */
    public String getErrDesc()
    {
        return errDesc;
    }		
}