Java 手写数据库链接+映射model

最新推荐文章于 2024-11-28 17:31:27 发布

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最新推荐文章于 2024-11-28 17:31:27 发布

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分类专栏： java 文章标签：反射 jdbc

本文链接：https://blog.youkuaiyun.com/mint_sprite/article/details/102545330

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这篇博客介绍了如何使用Java的反射和JDBC来手动建立数据库连接，并进行Model对象的映射。

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Java 手写数据库链接+映射model

‘’’
Class.forName(“com.microsoft.sqlserver.jdbc.SQLServerDriver”);

	String url = "jdbc:sqlserver://xx.xx.xx.xx:xxxx;database=xxxx";
	
	Connection conn = DriverManager.getConnection(url,"sa","xxxxx"); 
	System.out.println(conn.toString());
	System.out.println(conn.isValid(1000));
	
	Statement st = conn.createStatement();
	String sql = "SELECT * from userInfo where userPhone = 15377504766";
	ResultSet rs = st.executeQuery(sql);
	
	Class bean = Class.forName("com.jieyu.Userinfo");
	Field fields[] = bean.getDeclaredFields();
	
	for (Field field : fields) {
		field.setAccessible(true);
	}
	//System.out.println(JSON.toJSONString(fields));

    int i = 0;
    while(rs.next()) {
    	Object obj = bean.newInstance();
    	Userinfo userinfo = (Userinfo)obj;
    
    	for (Field field : fields) {
			String fieldName = field.getName();
			String fieldType = field.getGenericType().toString();
			switch(fieldType) {
				case "class java.lang.Integer":
					Integer intVal = rs.getInt(fieldName);
					System.out.println(fieldName+" = "+intVal);
					field.set(userinfo,intVal);
					break;
				case "class java.lang.String":
					String str = rs.getString(fieldName);
					System.out.println(fieldName+" = "+str);
					field.set(userinfo,str);
					break;
			}
			
			
		}
    	
    	System.out.println(userinfo.toString());

‘’’