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How To Experiment Dead Locks
How To Experiment Dead Locks? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to have some experience with dead locks, you can create two windows running two mysql transactions in two sessions at the REPEATABLE READ transaction isolation level. Then run some UPDATE statements a...
2007-05-09, 4658👍, 0💬

What Are Transaction Isolation Levels
What Are Transaction Isolation Levels? - MySQL FAQs - Transaction Management: Commit or Rollback There are 4 transaction isolation levels defined by SQL-1992 standard: READ UNCOMMITTED - The SELECT statements in one transaction will read uncommitted data changes from transactions of all connected se...
2007-05-09, 4624👍, 0💬

What Is a Dead Lock
What Is a Dead Lock? - MySQL FAQs - Transaction Management: Commit or Rollback A dead lock is phenomenon happens between two transactions with each of them holding a lock that blocks the other transaction as shown in the following diagram: (transaction 1) (transaction 2) update row X to create lock ...
2007-05-09, 4889👍, 0💬

What Is a Data Lock
What Is a Data Lock? - MySQL FAQs - Transaction Management: Commit or Rollback MySQL uses two types of data locks at two levels to provide you the transaction isolation level you need: Share Lock at Row Level (S) - A data row is locked by a transaction for reading. Exclusive Lock at Row Level (X) - ...
2007-05-09, 4555👍, 0💬

How To Test Transaction Isolation Levels
How To Test Transaction Isolation Levels? - MySQL FAQs - Transaction Management: Commit or Rollback If you want to test transaction isolation levels, you need to make sure that: The tables are created with transaction-safe storage engines, like InnoDB. Multiple-statement transactions are started wit...
2007-05-09, 5886👍, 0💬

What Are the Impacts on Applications from Locks, Timeouts, and DeadLocks
What Are the Impacts on Applications from Locks, Timeouts, and DeadLocks? - MySQL FAQs - Transaction Management: Commit or Rollback If you are using transactions with REPEATABLE READ isolation level and transaction safe storage engines in your applications, data locks, lock timeouts, and dead lock d...
2007-05-08, 4613👍, 0💬

How To Revoke User Privileges
How To Revoke User Privileges? - MySQL FAQs - Managing User Accounts and Access Privileges If your want remove some granted user privileges, you can use the "REVOKE privilegeName ..." command. You can only revoke privileges in the same way as they were granted. For example, you can not revoke a priv...
2007-05-08, 4905👍, 0💬

How To Give a User Read-Only Access to a Database
How To Give a User Read-Only Access to a Database? - MySQL FAQs - Managing User Accounts and Access Privileges If you want give a user read-only access to a database, you can grant to him/her only the "SELECT" privilege, so that he/she can not run any DDL statements, and any INSERT, UPDATE, or DELET...
2007-05-08, 6152👍, 0💬

Where Are User Privileges Stored on the Server
Where Are User Privileges Stored on the Server? - MySQL FAQs - Managing User Accounts and Access Privileges MySQL server has a system database, which hosts a number of system tables to system related information like user privileges. Depending on the scope levels, granted user privileges are stored ...
2007-05-08, 4907👍, 0💬

How Many SQL DDL Commands Are Supported by "mysql"
How Many SQL DDL Commands Are Supported by "mysql"? - MySQL FAQs - Command-Line End User Interface mysql There are 4 SQL Data Definition Language (DDL) commands that are supported by "mysql". They are listed below with short descriptions: "CREATE dataObjectType dataObjectName" - Creates new database...
2007-05-08, 4324👍, 0💬

What Are the "mysql" Command Line Options
What Are the "mysql" Command Line Options? - MySQL FAQs - Command-Line End User Interface mysql "mysql" offers a big list of command line options. Here are some commonly used options: "-?" - Displays a help message on how to use "mysql" and terminates the program. "-u userName" - Specifies a user na...
2007-05-08, 4210👍, 0💬

How To Perform Key Word Search in Tables
How To Perform Key Word Search in Tables? - PHP Script Tips - Working with MySQL Database The simplest way to perform key word search is to use the SELECT statement with a LIKE operator in the WHERE clause. The LIKE operator allows you to match a text field with a keyword pattern specified as '%keyw...
2007-04-19, 4618👍, 0💬

How To Query Multiple Tables Jointly
How To Query Multiple Tables Jointly? - PHP Script Tips - Working with MySQL Database If you want to query information stored in multiple tables, you can use the SELECT statement with a WHERE condition to make an inner join. Assuming that you have 3 tables in a forum system: "users" for user profile...
2007-04-19, 4580👍, 0💬

How To Quote Date and Time Values in SQL Statements
How To Quote Date and Time Values in SQL Statements? - PHP Script Tips - Working with MySQL Database If you want to provide date and time values in a SQL statement, you should write them in the format of "yyyy-mm-dd hh:mm:ss", and quoted with single quotes ('). The tutorial exercise below shows you ...
2007-04-19, 4233👍, 0💬

How To Quote Text Values in SQL Statements
How To Quote Text Values in SQL Statements? - PHP Script Tips - Working with MySQL Database Text values in SQL statements should be quoted with single quotes ('). If the text value contains a single quote ('), it should be protected by replacing it with two single quotes (''). In SQL language syntax...
2007-04-19, 4443👍, 0💬

How To Update an Existing Rows in a Table
How To Update an Existing Rows in a Table? - PHP Script Tips - Working with MySQL Database Updating existing rows in a table requires to run the UPDATE statement with a WHERE clause to identify the row. The following sample script updates one row with two new values: &lt;?php include "mysql_conn...
2007-04-19, 4328👍, 0💬

How To Query Tables and Loop through the Returning Rows
How To Query Tables and Loop through the Returning Rows? - PHP Script Tips - Working with MySQL Database The best way to query tables and loop through the returning rows is to run the SELECT statement with the catch the mysql_query() function, catch the returning object as a result set, and loop thr...
2007-04-19, 4408👍, 0💬

What Is a Result Set Object
What Is a Result Set Object? - PHP Script Tips - Working with MySQL Database A result set object is a logical representation of data rows returned by mysql_query() function on SELECT statements. Every result set object has an internal pointer used to identify the current row in the result set. Once ...
2007-04-19, 4251👍, 0💬

How To Insert Rows Based on SELECT Statements
How To Insert Rows Based on SELECT Statements? - PHP Script Tips - Working with MySQL Database If want to insert rows into a table based on data rows from other tables, you can use a sub-query inside the INSERT statement as shown in the following script example: &lt;?php include "mysql_connectio...
2007-04-19, 4330👍, 0💬

How To Insert Data into a Table
How To Insert Data into a Table? - PHP Script Tips - Working with MySQL Database If you want to insert a row of data into a table, you can use the INSERT INTO statement as shown in the following sample script: &lt;?php include "mysql_connection.php"; $sql = "INSERT INTO fyi_links (id, url) VALUE...
2007-04-19, 4220👍, 0💬

How To Get the Number of Rows Selected or Affected by a SQL Statement
How To Get the Number of Rows Selected or Affected by a SQL Statement? - PHP Script Tips - Working with MySQL Database There are two functions you can use the get the number of rows selected or affected by a SQL statement: mysql_num_rows($rs) - Returns the number of rows selected in a result set obj...
2007-04-19, 4363👍, 0💬

How To Create a Table
How To Create a Table? - PHP Script Tips - Working with MySQL Database If you want to create a table, you can run the CREATE TABLE statement as shown in the following sample script: &lt;?php include "mysql_connection.php"; $sql = "CREATE TABLE fyi_links (" . " id INTEGER NOT NULL" . ", url VARCH...
2007-04-19, 4299👍, 0💬

How To Run a SQL Statement
How To Run a SQL Statement? - PHP Script Tips - Working with MySQL Database You can run any types of SQL statements through the mysql_query() function. It takes the SQL statement as a string and returns different types of data depending on the SQL statement type and execution status: Returning FALSE...
2007-04-18, 4271👍, 0💬

How To Select an Exiting Database
How To Select an Exiting Database? - PHP Script Tips - Working with MySQL Database The first thing after you have created a connection object to the MySQL server is to select the database where your tables are locate, by using the mysql_select_db() function. If your MySQL server is offered by your W...
2007-04-18, 4412👍, 0💬

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