package com.enhance.jdbc;

import java.io.FileInputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.util.Properties;

/**
 * SQL语句的分类
 * select 语句
 * DML:(Data Manipulation Language)数据操作语言：检索 select 和 更新insert update delete
 * DDL:(Data Definition Language)数据定义语言： create alter drop truncate
 * DCL:(Data Control Language)数据控制语言：grant revoke
 * 事物控制语句:commit rollback savepoint 
 * 
 * 
 * executeQuery 执行  select语句  返回 resultSet
 * executeUpdate 执行 DML: update delete insert 返回受影响的行数,DDL: create drop alter 返回0 
 * execute 执行所有的sql语句  返回 boolean ,true:表示返回 resultset结果集, false:表示返回受影响的行数
 * @author Bin
 *
 */
public class ExecuteDDL {

	private String driver;
	private String url;
	private String user;
	private String pass;
	private Connection conn;
	private Statement stmt;
	public void initParam(String paramFile) throws Exception{
		Properties prop=new Properties();
		prop.load(new FileInputStream(paramFile));
		driver=prop.getProperty("driver");
		url=prop.getProperty("url");
		user=prop.getProperty("user");
		pass=prop.getProperty("pass");
	}
	
	public void createTable(String sql) throws Exception{
		
		try {
			Class.forName(driver);
			conn=DriverManager.getConnection(url,user,pass);
			stmt=conn.createStatement();
			stmt.executeUpdate(sql);
		} finally{
			if(stmt!=null)
				stmt.close();
			if(conn!=null)
				conn.close();
		}
		
	}
	/**
	 * 采用 executeUpdate 
	 * 		执行 DML 数据操作语言 中的 更新 语句  即  insert update delete   返回受影响的行数
	 * 		执行 DDL 数据定义语言  create alter drop truncate 返回  "0" 
	 * @param sql
	 * @return
	 * @throws Exception
	 */
	public int executeDmlAndDdl(String sql)throws Exception{
		try {
			Class.forName(driver);
			conn=DriverManager.getConnection(url,user,pass);
			stmt=conn.createStatement();
			return stmt.executeUpdate(sql);
		} finally{
			if(stmt!=null)
				stmt.close();
			if(conn!=null)
				conn.close();
		}
	}
	
	public static void main(String[] args) throws Exception {
		ExecuteDDL ed=new ExecuteDDL();
		//System.out.println(System.getProperty("user.dir"));

		ed.initParam("src/mysql.ini");
		/*ed.createTable("create table jdbc_test"
				+ "( jdbc_id int auto_increment primary key,"
				+ "jdbc_name varchar(255),"
				+ "jdbc_desc text);");*/
		
		//System.out.println(ed.executeDmlAndDdl("select host,user,password from user"));
		
		ed.executeDmlAndDdl("create table img_table"
				+ "(img_id int auto_increment primary key,"
				+ "img_name varchar(255),"
				+ "img_data mediumblob);");
		
		System.out.println("---------建表成功-------");

	}

}