JAVA初学者必备的连库类

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package cn.com.myle.dao;


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


public class BaseDAO {
private static final String DRIVER = "com.microsoft.sqlserver.jdbc.SQLServerDriver";// SQL Server 2005的JDBC驱动类


private static final String URL = "jdbc:sqlserver://localhost:1433;DatabaseName=AlbumPhotoDB";// 用于标识数据库的URL


private static final String UNAME = "sa";// 数据库用户名


private static final String UPWD = "sa";// 数据库密码


protected Connection con;// 数据库连接对象


protected PreparedStatement pstm;// 预编译的SQL语句对象


protected Statement stmt;// SQL语句对象


protected ResultSet rs;// 结果集对象


// 获取数据库连接
protected void getConnection() throws Exception {
Class.forName(DRIVER);
con = DriverManager.getConnection(URL, UNAME, UPWD);
}


// 释放数据库资源
protected void closeAll() {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (pstm != null) {
try {
pstm.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (stmt != null) {
try {
stmt.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
try {
if (con != null && con.isClosed() == false) {
con.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}

}