jdbc通用的增删改操作

编程

通用的增删改操作

PreparedStatementUpdateTest.java

public class PreparedStatementUpdateTest {

@Test

public void testCommonUpdate() {

// String sql = "delete from customers where id = ?";

// update(sql,3);

String sql = "update `order` set order_name = ? where order_id = ?";

update(sql, "DD", "2");

}

//通用的增删改操作

public void update(String sql, Object... args) {//sql中占位符的个数与可变形参的长度相同!

Connection conn = null;

PreparedStatement ps = null;

try {

//1.获取数据库的连接

conn = JDBCUtils.getConnection();

//2.预编译sql语句,返回PreparedStatement的实例

ps = conn.prepareStatement(sql);

//3.填充占位符

for (int i = 0; i < args.length; i++) {

//小心参数声明错误!!参数索引是从0开始的。预编译sql的占位符的索引从1开始

ps.setObject(i + 1, args[i]);

}

//4.执行

ps.execute();

} catch (Exception e) {

e.printStackTrace();

} finally {

//5.资源的关闭

JDBCUtils.closeResource(conn, ps);

}

}

}

JDBCUtils.java

public class JDBCUtils {

public static Connection getConnection() throws Exception {

// 1.读取配置文件中的4个基本信息

InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream("jdbc.properties");

Properties pros = new Properties();

pros.load(is);

String user = pros.getProperty("user");

String password = pros.getProperty("password");

String url = pros.getProperty("url");

String driverClass = pros.getProperty("driverClass");

// 2.加载驱动

Class.forName(driverClass);

// 3.获取连接

Connection conn = DriverManager.getConnection(url, user, password);

return conn;

}

public static void closeResource(Connection conn,Statement ps){

closeResource(conn,ps,null);

}

//关闭资源操作

public static void closeResource(Connection conn,Statement ps,ResultSet rs){

try {

if(ps != null)

ps.close();

} catch (SQLException e) {

e.printStackTrace();

}

try {

if(conn != null)

conn.close();

} catch (SQLException e) {

e.printStackTrace();

}

try {

if(rs != null)

rs.close();

} catch (SQLException e) {

e.printStackTrace();

}

}

}

jdbc.properties

user=root

password=123456

url=jdbc:mysql://192.168.220.11:3306/test?rewriteBatchedStatements=true

driverClass=com.mysql.cj.jdbc.Driver

 

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