package dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class BaseDao {
	public static final String driver = "com.microsoft.sqlserver.jdbc.SQLServerDriver";
	public static final String url = "jdbc:sqlserver://127.0.0.1:1433;database=ebook";
	public static final String uid = "sa";
	public static final String pwd = "123456";
	
	/**
	 * 创建连接对象
	 * @return
	 */
	public Connection getConnection(){
		Connection connection = null;
		try {
			Class.forName(driver);
			connection = DriverManager.getConnection(url,uid,pwd);
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		return connection;
	}
	
	/**
	 * 关闭全部连接
	 * @param connection
	 * @param statement
	 * @param result
	 */
	public void closeAll(Connection connection,PreparedStatement statement,ResultSet result){
		if (result != null){
			try {
				result.close();
				result = null;
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		if (statement != null){
			try {
				statement.close();
				statement = null;
			} catch (SQLException e) {
				e.printStackTrace();
			}
		}
		try {
			if (connection != null && !(connection.isClosed())){
				connection.close();
			}
		} catch (SQLException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 执行增、删、改操作
	 * @param sql
	 * @param param
	 * @return
	 */
	public int executeQuery(String sql,String[] param){
		Connection connection = null;
		PreparedStatement statement = null;
		int num = 0;
		try {
			connection = this.getConnection();
			statement = connection.prepareStatement(sql);
			for (int i = 0 ; i < param.length ; i++){
				statement.setString(i+1, param[i]);
			}
			num = statement.executeUpdate();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			this.closeAll(connection, statement, null);
		}
		return num;
	}
}