begintransaction

Save, update, and delete data:1. Session. save () method:The Session. save () method is used to persistently store object objects. That is to say, when session. save () is executed, an insert SQL statement is generated to save data. The following

  Group. Java object file package com.model;import java.util.HashSet;import java.util.Set;import javax.persistence.CascadeType;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import

// Import the imported hibernate package Import net. SF. hibernate. cfg. configuration; Import net. SF. hibernate. hibernateexception; Import net. SF. hibernate. sessionfactory; Import net. SF. hibernate. Session; Import net. SF. hibernate.

To save convenience, you can specify multiple;-separated statements in the commandtext attribute of a command object. In this case, if there is no transaction, all the statements will be executed. If there is a statement error, data inconsistency

Getting started with a database requires first configuring the database Connectivity component by adding a DB component to the application configuration implementation (the "underlying" Web application is config/web.php), and the DSN (data source

For now, implementing the "Database Abstraction Layer" is a great way to go, and using a database access abstraction layer like PDO is a good choice. The PDO contains three predefined classes The PDO contains three predefined classes, which are PDO,

Yii2 database read/write splitting configuration example, yii2 example To start using a database, you must first configure the database connection component and add the db component to the application configuration. (the "Basic" Web application is

Hibernate cache has been more difficult to master, the following analysis and summary of the reasons, I believe you will slowly understand that the original hibernate cache is also easy to grasp, but the premise requires that we must follow hands to

Hibernate cache application accumulation and summary, and hibernate cache Accumulation Hibernate cache has been relatively difficult to grasp, the following analysis and summary of the reasons, I believe you will gradually understand the original

Getting started with a database requires first configuring the database Connectivity component by adding a DB component to the application configuration implementation (the "base" Web app is config/web. PHP), DSN (data source name) is the data

What is a database transaction? Database transactions are a series of operations performed as a single logical unit of work. Imagine a transaction for online shopping. the payment process includes at least the following database operations: · Update

Before reading this article, you need the following knowledge and tools: Tomcat 5.09, which can beWww.apache.orgDownload; The operating environment of hibernate2.0 can beHttp://hibernate.bluemars.net/Download; At least one database server is

Basic Database Operations and related APIs through Hibernate The configuration process is omitted. Public class HibernateUtils. java for database connection   Package test. hibernate. dao; import org. hibernate. session; import org. hibernate.

PDO is a database access abstraction layer used to unify access interfaces of various databases. Compared with mysql and mysqli function libraries, PDO makes cross-database use more friendly; compared with ADODB and MDB2, PDO is more efficient. At

PDO is a "database access abstraction Layer" that unifies the access interfaces of various databases, and PDO makes cross-database usage more affinity than MySQL and mysqli libraries, and PDO is more efficient than ADODB and MDB2.for now,

1. Overview of hibernate development stepsI just briefly summarized the development steps of hibernate. It may be one-sided, but I hope you will share it with me.The development process of hibernate can be summarized into four steps: Configure

Android homepage fragment Switching Method 1: Layout file: Android: layout_width = match_parent Android: layout_height = match_parent Android: orientation = vertical> android:id="@+id/content_frame_mainAndroid: layout_width = match_parent

1. Fragment Overview In an Activity, Fragment represents a part or action of the UI. An Activity can combine multiple Fragment objects or use different objects corresponding to the same Fragment bytecode in multiple activities. A Fragment object

Application and Research of AOP technology -- simple application of AOP and Application of aop technology -- aop In order to better understand AOP practices and reflect the advantages of AOP, we will always compare OOP with AOP in the following

Chapter 2 Java card objects   In Java card technology, jcres and applets Express, store, and operate data by creating objects. Applets uses Java Programming Language. The applets running on the card is the object of the Applet Class.