10 Articles recommended for commit

The entire transaction can be written or revoked using a simple ROLLBACK and COMMIT statement with a reserved point. However, just for simple transactions to do this, more complex transactions may require partial commit or fallback. For example, the process of adding an order described earlier is a transaction. If an error occurs, you only need to return to the order line before you add it, and you do not have to fall back to the Customers table, if one exists. In order to support fallback partial transactions, placeholders must be placed in the appropriate location in the transaction block. This allows fallback to a placeholder if fallback is required. These placeholders are called retention points. In order to create placeholders, you can use the SavePoint statement as follows: Enter: SavePoint Deletel; Each reservation is given a unique name that identifies it so that when it is rolled back, MySQL knows where to fall back. In order to fall back to the retention point given in this example, the following can be done: input: rollback to Deletel; You can set as many retention points as you want in your MySQL code, the more

1. Detailed introduction to changing the default

Summary: You can write or revoke an entire transaction using a simple ROLLBACK and COMMIT statement with a reserved point. However, just for simple transactions to do this, more complex transactions may require partial commit or fallback. For example, the process of adding an order described earlier is a transaction. If an error occurs, you only need to return to the order line before you add it, and you do not have to fall back to the Customers table, if one exists. In order to support fallback partial transactions, placeholders must be placed in the appropriate location in the transaction block. In this way, as ...

2. PHP mysqli_commit () function and Mysqli_autocommit () function comparison

Brief introduction:

3. mysql transaction-use a retention point and change the default commit behavior

Summary: You can write or revoke an entire transaction using a simple ROLLBACK and COMMIT statement with a reserved point. However, just for simple transactions to do this, more complex transactions may require partial commit or fallback. For example, the process of adding an order described earlier is a transaction. If an error occurs, you only need to return to the order line before you add it, and you do not have to fall back to the Customers table, if one exists. In order to support fallback partial transactions, placeholders must be placed in the appropriate location in the transaction block. This allows fallback to a placeholder if fallback is required.

4. mysql Transaction-rollback,commit usage

Introduction: Using rollback since we already know what transaction processing is, the following discussion deals with the issues involved in managing transactions. The key to managing transactions is to break down the group of SQL statements into logical blocks and specify when the data should be rolled back and when it should not be rolled back. MySQL uses the following statement to identify the start of a transaction:

5. Details of transaction handling in PDO

Summary: A transaction (transaction) consists of a sequence of queries and/or UPDATE statements. Begins a transaction with begin, start transaction, rollback rolls back the transaction, commits the transaction. After starting a transaction, you can have several SQL queries or UPDATE statements, and after a SQL submission executes, there should be a statement that determines whether the next step is rolled back, and if it is executed correctly, the transaction is finally committed. Once a transaction is rolled back, the database remains in the pre-transaction state. As if an edited file does not save the file to exit, or to maintain the original appearance of the document. So, a transaction can be considered an atomic operation, a SQL in a transaction, or a full

6. In-depth understanding of class 4 isolation levels in MySQL

Summary: The SQL standard defines class 4 isolation levels, including specific rules that define which changes within and outside a transaction are visible and which are not. Low-level isolation levels generally support higher concurrency processing and have lower system overhead. READ UNCOMMITTED (Read UNCOMMITTED content) at that isolation level, all transactions can see the execution results of other uncommitted transactions. This isolation level is rarely used in real-world applications because it has no better performance than other levels. READ UNCOMMITTED data, also known as dirty reads (Dirt

7. Getting started with MySQL transaction basics

Summary: What is MySQL transaction? Business, usually refers to the things to do or do. In computer terminology, it refers to a program execution unit (unit) that accesses and possibly updates various data items in a database. 2. What is the use of the case? Things are commonly used when working with multiple tables concurrently to ensure the integrity of the user's data. There are two main ways to deal with MySQL 1. Begin with Begin,rollback,commit to start a transaction roll

8. Detailed introduction to Spring transaction principles

Introduction: First, the basic principle of the transaction the essence of spring transaction is that the database supports the transaction, and without the transaction support of the database, spring cannot provide the transaction function. For a pure JDBC operations database, to use a transaction, you can follow these steps: Get connection Connection con = drivermanager.getconnection () Turn on transaction con.setautocommit (True/false ); Perform crud COMMIT TRANSACTION/ROLLBACK TRANSACTION con.commit ()/C..

9. Database-Four types of transaction isolation levels

Summary: The database provides four transaction isolation levels, with different isolation levels implemented with different lock classes. Of the four isolation levels, the serializable has the highest level and the Read uncommited level is the lowest. The default isolation level for most databases is: Read commited, such as SQL Server, Oracle. The default isolation level for a few databases is repeatable Read, such as the MySQL InnoDB storage engine

10. Simple Introduction to MySQL cluster (figure)

Introduction: First, what is MySQL cluster mysql cluster is a non-shared (shared-nothing), Distributed node architecture storage Scheme, which is designed to provide fault tolerance and high performance. Data Update uses Read Committed isolation level (read-committedisolation) to ensure consistency of all node data using the two-phase commit mechanism (TWO-PHASEDCOMMIT) Ensure that all nodes have the same data (the update fails if any one of the write operations fails).

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