JDBC开发模式

来源：互联网发布：苹果cms手机模板编辑：程序博客网时间：2024/05/05 09:43

一】代码模块———Demo.java

 　　　　　　public class Demo {                private static Connection connection;                private static Statement statement;                private static ResultSet rs;                            public static void main(String[] args) {                                connection = JDBCUtils.getConnection();                                try {                        statement = connection.createStatement();                        rs = statement.executeQuery(SqlMapping.QEURY_ALL);                                    while (rs.next()) {                            System.out.println(rs.getInt("id") + " : "                                    + rs.getString("name") + " : " + rs.getString("gender")                                    + " : " + rs.getString("salary"));                        }                                } catch (SQLException e) {                        e.printStackTrace();                    }                                JDBCUtils.closeStream(rs, statement, connection);                            }

二】工具模块———JdbcUtil.java

                    public class JDBCUtils {                            private static Properties properties;                    //得到数据库驱动                    static {                        InputStream inputStream  = JDBCUtils.class.getClassLoader().getResourceAsStream("com/suse/jdbc/db.properties");                        properties = new Properties();                        try {                            properties.load(inputStream);                            Class.forName(properties.getProperty("driver"));                        } catch (IOException e) {                            e.printStackTrace();                        } catch (ClassNotFoundException e) {                            e.printStackTrace();                        }                    }                                        //得到数据库连接                    public static Connection getConnection(){                            Connection connection  = null;                            try {                                connection = DriverManager.getConnection(properties.getProperty("url"), properties);                            } catch (SQLException e) {                                e.printStackTrace();                            }                            return connection;                    }                                                            //关闭流                    public static void closeStream( ResultSet rs, Statement stmt, Connection conn) {                                                if (null != rs) {                            try {                                rs.close();                            } catch (SQLException e) {                                e.printStackTrace();                            }                        }                        if (null != stmt) {                            try {                                stmt.close();                            } catch (SQLException e) {                                e.printStackTrace();                            }                        }                        if (null != conn) {                            try {                                conn.close();                            } catch (SQLException e) {                                e.printStackTrace();                            }                        }                    }                    }

三】配置文件模块———db.properties

　　　　　　  driver = com.mysql.jdbc.Driver            url  = jdbc:mysql://127.0.0.1:3306/mydb            user = root            password = root

0 0