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HomeDatabaseMysql Tutorial10 recommended articles about SSE

PHP can connect to the database but cannot create database, how to solve it? Paste the code first: PHP code I wrote this code under zend, the running environment is WAMP, and the running result is successERROR, which means there is no problem connecting to the database, but there is an error when executing CREATE DATABASE hello. I don't understand what's going on, please give me some advice. ------solution-------------------- Check to see if you have permission to create a database ------Solution--------------------You change echo "ERROR"; to echo mysql_error(); and you don't need any "meaning" 1. PHP can connect to the database but cannot create database. How to solve the problem? Introduction: PHP can connect to the database but cannot create database. How to solve the problem? Paste the code first: PHP code

1. 5 recommended articles about mysql_errno()

10 recommended articles about SSE

Introduction: PHP can connect to the database but cannot create database, how to solve it? First post the code: PHP code, I wrote this code under zend, the running environment is WAMP, the running result is successERROR, which means there is no problem connecting to the database, but there is an error when executing CREATE DATABASE hello. I don't understand what's going on, please give me some advice. ------Solution--------------------See if you have permission to create a database...

2. Recommended 10 articles about the mysql_errno() function

10 recommended articles about SSE

##Introduction: PHP can connect Database but cannot create database, how to solve it? First post the code: PHP code, I wrote this code under zend, the running environment is WAMP, the running result is successERROR, which means there is no problem connecting to the database, but there is an error when executing CREATE DATABASE hello. I don't understand what's going on, please give me some advice. ------Solution--------------------Check if you have permission to create a database-----...

3. 10 recommended content for Label control

10 recommended articles about SSE

Introduction: For To describe the problem clearly, let's first look at an example. In this example, there is a button on the WinForm. When the user clicks the button, an existing Assembly will be loaded, and the FullName of the Assembly will be displayed on the Label control of the interface. Friends who are a little familiar with Reflection know that this is a very simple thing. You only need to use the Assembly.LoadFile method to obtain the Assembly, and then use the FullName attribute to display it, such as the following...

4. Summarize the points to note about loading and unloading

10 recommended articles about SSE

Introduction: In order to solve the problem To describe clearly, let’s look at an example first. In this example, there is a button on the WinForm. When the user clicks the button, an existing Assembly will be loaded, and the FullName of the Assembly will be displayed on the Label control of the interface. Friends who are a little familiar with Reflection know that this is a very simple thing. You only need to use the Assembly.LoadFile method to obtain the Assembly, and then use the FullName attribute to display it, such as the following...

5. Recommend 10 AppDomain source codes (collection)

10 recommended articles about SSE

Introduction: In order to The problem is clearly described, let's look at an example first. In this example, there is a button on the WinForm. When the user clicks the button, an existing Assembly will be loaded, and the FullName of the Assembly will be displayed on the Label control of the interface. Friends who are a little familiar with Reflection know that this is a very simple thing. You only need to use the Assembly.LoadFile method to obtain the Assembly, and then use the FullName attribute to display it, such as the following...

6. Summary of 10 basic drawing usage example tutorials

10 recommended articles about SSE

Introduction: Pseudo classes and pseudo elements are independent of the document structure. The way they obtain elements is not based on basic element characteristics such as id, class, and attributes, but on elements in a special state (pseudo-classes), or on special content in the elements (pseudo-elements). The differences are summarized as follows: CSS pseudo-classes (Pseudo-classes): used to add special effects to certain selectors, that is, add special effects (usually dynamic effects) based on the current static style of the element, so an element When it reaches a specific state, it may get a pseudo-class style; when the state changes...

7. Recommended articles about bootstrap.js

10 recommended articles about SSE

Introduction: This article mainly introduces a detailed explanation of how to introduce bootstrap.js in the advanced version of Yii2, which has certain reference value. , interested friends can refer to it. In frontend/assets/AppAsset.php code sample namespace frontend\assets;use yii\web\AssetBundle;/** * Main frontend...

8. 10 recommended articles about testing framework

10 recommended articles about SSE

##Introduction: This article gives you a brief introduction The installation and simple usage of mocha, the most commonly used testing framework in NodeJS, supports running Javascript code tests directly on the browser. The most commonly used testing framework recommended here is mocha. It supports a variety of node assert libs, supports both asynchronous and synchronous testing, supports multiple ways to export results, and also supports running Javascript code tests directly on the browser. Most of the examples in this article are from the official website examples, part...

9. Detailed introduction to parameter tuning

10 recommended articles about SSE

Introduction: nginx parameter tuning worker_processes 3; //The number of cpu cores is -1, the effect is better when used #worker_processes 4;#worker_cpu_affinity 0001 0010 0100 1000;# error_log logs/error.log;#error_log logs/error.log notice;#error_log logs/error.log...

10. 10 recommended articles about sizeof

10 recommended articles about SSE

Introduction: 1. Introduction In the previous article, we created a window from scratch. One of the most important steps is to register the window class, as shown in the following code: //Register window class BOOL Register(LPSTR lpClassName, WNDPROC wndProc){    WNDCLASSEX ...

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Explain the role of InnoDB redo logs and undo logs.Explain the role of InnoDB redo logs and undo logs.Apr 15, 2025 am 12:16 AM

InnoDB uses redologs and undologs to ensure data consistency and reliability. 1.redologs record data page modification to ensure crash recovery and transaction persistence. 2.undologs records the original data value and supports transaction rollback and MVCC.

What are the key metrics to look for in an EXPLAIN output (type, key, rows, Extra)?What are the key metrics to look for in an EXPLAIN output (type, key, rows, Extra)?Apr 15, 2025 am 12:15 AM

Key metrics for EXPLAIN commands include type, key, rows, and Extra. 1) The type reflects the access type of the query. The higher the value, the higher the efficiency, such as const is better than ALL. 2) The key displays the index used, and NULL indicates no index. 3) rows estimates the number of scanned rows, affecting query performance. 4) Extra provides additional information, such as Usingfilesort prompts that it needs to be optimized.

What is the Using temporary status in EXPLAIN and how to avoid it?What is the Using temporary status in EXPLAIN and how to avoid it?Apr 15, 2025 am 12:14 AM

Usingtemporary indicates that the need to create temporary tables in MySQL queries, which are commonly found in ORDERBY using DISTINCT, GROUPBY, or non-indexed columns. You can avoid the occurrence of indexes and rewrite queries and improve query performance. Specifically, when Usingtemporary appears in EXPLAIN output, it means that MySQL needs to create temporary tables to handle queries. This usually occurs when: 1) deduplication or grouping when using DISTINCT or GROUPBY; 2) sort when ORDERBY contains non-index columns; 3) use complex subquery or join operations. Optimization methods include: 1) ORDERBY and GROUPB

Describe the different SQL transaction isolation levels (Read Uncommitted, Read Committed, Repeatable Read, Serializable) and their implications in MySQL/InnoDB.Describe the different SQL transaction isolation levels (Read Uncommitted, Read Committed, Repeatable Read, Serializable) and their implications in MySQL/InnoDB.Apr 15, 2025 am 12:11 AM

MySQL/InnoDB supports four transaction isolation levels: ReadUncommitted, ReadCommitted, RepeatableRead and Serializable. 1.ReadUncommitted allows reading of uncommitted data, which may cause dirty reading. 2. ReadCommitted avoids dirty reading, but non-repeatable reading may occur. 3.RepeatableRead is the default level, avoiding dirty reading and non-repeatable reading, but phantom reading may occur. 4. Serializable avoids all concurrency problems but reduces concurrency. Choosing the appropriate isolation level requires balancing data consistency and performance requirements.

MySQL vs. Other Databases: Comparing the OptionsMySQL vs. Other Databases: Comparing the OptionsApr 15, 2025 am 12:08 AM

MySQL is suitable for web applications and content management systems and is popular for its open source, high performance and ease of use. 1) Compared with PostgreSQL, MySQL performs better in simple queries and high concurrent read operations. 2) Compared with Oracle, MySQL is more popular among small and medium-sized enterprises because of its open source and low cost. 3) Compared with Microsoft SQL Server, MySQL is more suitable for cross-platform applications. 4) Unlike MongoDB, MySQL is more suitable for structured data and transaction processing.

How does MySQL index cardinality affect query performance?How does MySQL index cardinality affect query performance?Apr 14, 2025 am 12:18 AM

MySQL index cardinality has a significant impact on query performance: 1. High cardinality index can more effectively narrow the data range and improve query efficiency; 2. Low cardinality index may lead to full table scanning and reduce query performance; 3. In joint index, high cardinality sequences should be placed in front to optimize query.

MySQL: Resources and Tutorials for New UsersMySQL: Resources and Tutorials for New UsersApr 14, 2025 am 12:16 AM

The MySQL learning path includes basic knowledge, core concepts, usage examples, and optimization techniques. 1) Understand basic concepts such as tables, rows, columns, and SQL queries. 2) Learn the definition, working principles and advantages of MySQL. 3) Master basic CRUD operations and advanced usage, such as indexes and stored procedures. 4) Familiar with common error debugging and performance optimization suggestions, such as rational use of indexes and optimization queries. Through these steps, you will have a full grasp of the use and optimization of MySQL.

Real-World MySQL: Examples and Use CasesReal-World MySQL: Examples and Use CasesApr 14, 2025 am 12:15 AM

MySQL's real-world applications include basic database design and complex query optimization. 1) Basic usage: used to store and manage user data, such as inserting, querying, updating and deleting user information. 2) Advanced usage: Handle complex business logic, such as order and inventory management of e-commerce platforms. 3) Performance optimization: Improve performance by rationally using indexes, partition tables and query caches.

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