Course 2857
Course Introduction:Course introduction: 1. Cross-domain processing, token management, route interception; 2. Real interface debugging, API layer encapsulation; 3. Secondary encapsulation of Echarts and paging components; 4. Vue packaging optimization and answers to common problems.
Course 1795
Course Introduction:Apipost is an API R&D collaboration platform that integrates API design, API debugging, API documentation, and automated testing. It supports grpc, http, websocket, socketio, and socketjs type interface debugging, and supports privatized deployment. Before formally learning ApiPost, you must understand some related concepts, development models, and professional terminology. Apipost official website: https://www.apipost.cn
Course 5521
Course Introduction:(Consult WeChat: phpcn01) The comprehensive practical course aims to consolidate the learning results of the first two stages, achieve flexible application of front-end and PHP core knowledge points, complete your own projects through practical training, and provide guidance on online implementation. Comprehensive practical key practical courses include: social e-commerce system backend development, product management, payment/order management, customer management, distribution/coupon system design, the entire WeChat/Alipay payment process, Alibaba Cloud/Pagoda operation and maintenance, and project online operation. .....
Course 5172
Course Introduction:(Consult WeChat: phpcn01) Starting from scratch, you can solve conventional business logic, operate MySQL with PHP to add, delete, modify, and query, display dynamic website data, master the MVC framework, master the basics of the ThinkPHP6 framework, and learn and flexibly master all knowledge involved in PHP development. point.
Course 8713
Course Introduction:(Consult WeChat: phpcn01) The learning objectives of the front-end development part of the 22nd issue of PHP Chinese website: 1. HTML5/CSS3; 2. JavaScript/ES6; 3. Node basics; 4. Vue3 basics and advanced; 5. Mobile mall/ Website background homepage layout; 6. Automatic calculation of tabs/carousels/shopping carts...
java - JDBC Connection 的 rollback 方法在哪里调用?
2017-04-18 10:20:24 0 2 328
mysql - Java WEB 参数正常,各项正常,无法从数据库获取结果?
2017-04-18 10:06:51 0 5 492
Course Introduction:Java is a widely used programming language used to develop various types of applications, including database applications. When dealing with a database, various errors may occur, one of the common errors is SQLException. SQLException is a Java exception that indicates an error occurred during database access. This exception is usually caused by connection errors, syntax errors, access permissions, or data integrity issues. When encountering SQLException, the following are some possibilities
2023-06-24 comment 0 3040
Course Introduction:SQLException can occur in drivers and databases. When such an exception occurs, an object of type SQLException is passed to the catch clause. The passed SQLException object has the following methods that can be used to retrieve additional information about the exception: Method Description getErrorCode() Gets the error number associated with the exception. getMessage() gets the error message of the JDBC driver handled by the driver, or gets the Oracle error number and message of the database error. getSQLState() gets the XOPENSQLstate string. For JDBC driver errors, this method does not return any useful
2023-09-10 comment 0 614
Course Introduction:In what scenarios does a SQLException occur when connecting to a database in Java? In Java, when using JDBC to connect to a database, one of the common exceptions is SQLException. SQLException exceptions will appear in the following situations: Database connection problems When the program cannot connect to the database, SQLException exceptions are usually thrown. For example, the URL address of the database connection is wrong, the user name and password are wrong, the data
2023-06-25 comment 0 624
Course Introduction:What are the common causes of SQLException when connecting to a database in Java? In Java development, Database operation is a very critical link. Among them, JDBC is required for commonly used CRUD operations, especially SELECT and INSERT operations. However, in JDBC application development, SQLException may occur during the connection operation with the database, the execution process of the SQL language, and the processing of the result set. This article will analyze
2023-06-24 comment 0 2435
Course Introduction:In Java programs, connecting to the database is a very common operation. Although ready-made class libraries and tools can be used to connect to the database, various abnormal situations may still occur during program development, among which SQLException is one of them. SQLException is an exception class provided by Java. It describes errors that occur when accessing the database, such as query statement errors, table non-existence, connection disconnection, etc. For Java programmers, especially those using JDBC (Java Data
2023-06-24 comment 0 1314