m a transactions database

In actual projects, we often encounter the need to execute multiple SQL statements in batches to implement database transactions! Next, we will execute multiple SQL statements in batches to implement database transactions.Code: The two methods are as follows: -------- Method 1 ------------- /// -------------------------- method 2 -----------------------

C # Access database software uses transactions to insert multiple recordsprotected void Button1_Click (object sender, EventArgs e){/*============= Test Passed ===============*/OleDbConnection con = newOleDbConnection ("Provider=microsoft.jet.oledb.4.0;daTaSource=c:/inetpub/wwwroot/dotnetarticle/app_data/dotnetarticle.mdb ");Con. Open ();OleDbCommand cmd = new OleDbCommand ();Cmd. Connection = con;Cmd. Trans

simulates three libraries (in the same instance), namely DB1, DB2, DB3The business of the whole transaction is as follows: 1, DB1 write table Data 2, DB2 write table Data 3, DB3 Call stored procedure write table Data 4, each write table data interval simulate throw exception flow, see if data rollbackThe code is as follows:BEGIN TRY BEGIN TRAN INSERT into DB1. dbo. Log ( Type, Message, Stack, Created ) VALUES ( 0, --Type-int N ' Message ', --Message-nvarchar (+) N ' Stack ', --Stack

XA transaction support is limited to INNODB storage engines. MySQL XA implementations are for external XA, where the MySQL server acts as a resource manager, and the client program acts as the transaction manager. "Internal XA" is not implemented. This allows a separate storage engine within the MySQL server as RM (Resource Manager) and the server itself as a TM

100 yuan remaining in his Beijing account, then he used an ATM to call his Beijing account 1000. When prompted to confirm the submission, he used his mobile phone to check that his account balance was actually 1100. Exceptions in concurrent database operations-repeated read is not allowed Set the database isolation level: SetTRANSACTION isolation level readcommitted; business scenario: Michael used his

Student After insert As Update Student set sname= ' oooo ' where sid= (select inserted. SID from Inserted) Insert INTO Student select ' Moyao ', ' 1989-11-15 ', ' Male ' SELECT * FROM Student Where the inserted table is a temporary table Stores the information that will be inserted The purpose of this trigger is to check if the information to be inserted conforms to the specified (There are no special records in the product table) This is an example

delimiter//CREATE PROCEDURE P4 (out status int) BEGIN --1. Declares that {set status = 1 is executed if an exception occurs; Rollback ---}--Start transaction--minus 100 from fought account--Fang Shaowei account plus 90--Zhanggen account plus 10 Commit --End Set status = 2; END//delimiter; #实现delimiter//create PROCEDURE P5 (out P_return_code tinyint) BEGIN DECLARE exit Handl Er for SqlException BEGIN--ERROR set p

Label:public void Testtrasaction () throws exception{Personsqliteopenhelper helper = new Personsqliteopenhelper (GetContext ());Sqlitedatabase db = Helper.getwritabledatabase ();Db.begintransaction ();try{Db.execsql ("update sys_user Set account = account-500 where Name=?", New object[]{"Zhangsan"});Db.execsql ("update sys_user Set account = account+500 where Name=?", New object[]{"Lisi"});Mark database transaction execution succeeded.Db.settransactio

Properties of database Transactions-acid 1, database Transaction Properties-acid (the first letter of four English words): 1) Atomic sex (atomicity) So-called atomicity is the operation of a group of operations as an atomic operation, that is either all executed or not. 2) Consistency (consistency) The consistency of

One, in the transaction a thread (transaction), B thread ① the same connection operation is the same table, if the A-thread operation is rolled back, the operation of the B-thread is also rolled back ② the same connection operation two different tables, if the operation of a thread is rolled back, the operation of the B thread will also be rolled back ③ two diffe

structured as follows:3. Concrete implementation of 3.1 Ishedulerjob3.2 Job3.3SchedulerConfiguration3.4Scheduler3.5 Viewer4. OptimizationA. Two transactions are related to the database of the majority of the deletion and modification, in order to ensure the uniqueness of the data, the database operations to take a tra

foreign key index !!!)? Reply content: The situation is as follows: TableId int (11) Table BA_id int (11) The a_id of Table B is the foreign key of Table A's primary key. ----------- The dividing line of all evil ------------ I enabledmysqlAnd then insert a data entry toTable(Hereinafter referred toOperation 1), And then insert the dataTable B(Hereinafter referred toOperation 2). Operation 2 depends on the ID returned after operation 1 is successf

Beginners of software development are not very familiar with stored procedures and transactions. Today, we will give you a simple example of a transaction, so that you can understand it first. Then we will explain the stored procedure to you. Start transaction: Begin transaction Commit transaction: commit transaction Rollback transaction: rollback transaction Exa

In the development of Android applications, transaction processing is very important when using a database. first Android database operations (especially write operations) are very slow, and packing all operations into one transaction can greatly improve processing speed. is followed by ensuring that data is consistent so that all operations in one

Transactions: More of a processing mechanism (die)Transactions are for additions and deletions (because they change the data)A transaction is composed of multiple SQL statements for multiple statements, and the overall executionThe 4 characteristics of a transaction are call

/// ///multi-database server transaction Submission/// /// key is connname,value as SQL statement /// Public BOOLExecutemultitran (liststring[]>sqlstrings) { BOOLReval =true; SqlCommand cmd=NewSqlCommand (); SqlTransaction Tran; SqlConnection Conn; //transaction Object name, collection of transaction objectsdictionarystring, sqltransaction> Tranresult =Newdictionarystring, sqltransaction>(); //Conn Object name, Obj

In the MVC framework, most departments in some PHP frameworks are a table corresponding to an M file. Suddenly, I wonder how it works if there is a transaction? In the MVC framework, most departments in some PHP frameworks are a table corresponding to an M file. Suddenly, I wonder how it works if there is a transaction

Features of the transaction:1) atomicity (atomicity): A transaction is a logical unit of work for a database, and it must be an atomic unit of work, either fully executed or not executed for its data modification.2) Consistency (consistency): When a transaction is complete,

Features of the transaction:1) atomicity (atomicity): A transaction is a logical unit of work for a database, and it must be an atomic unit of work, either fully executed or not executed for its data modification.2) Consistency (consistency): When a transaction is complete,

transaction cannot be disturbed by other transactions, that is, the internal operation of one transaction and the data used are isolated from other concurrent transactions, and cannot interfere with each other in concurrently executing transactions. (4) Persistence (durability) Persistence is the fact that once a tran