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SQL cursor usage examples

This article mainly introduces: SQL cursor usage examples, you can refer to them if you need them.

Dec 14, 2016 am 11:23 AM

Under normal circumstances, when we use SELECT query statements, they are all for one row of records. If you want to read multiple rows of records (i.e., recordset) in the query analyzer, you need to use a cursor or WHILE Waiting loop

Dec 14, 2016 am 11:20 AM

How much faster is preg_replace than ereg_replace?

preg_replace is a text matching mode built into Perl, but some parameters are more complicated to use than ereg_relace. In actual project applications, many people use ereg.

Dec 14, 2016 am 11:15 AM

ereg_replace preg_replace

Performance comparison of for, while, foreach

Generally, there are three methods for traversing an array, for, while, and foreach. The simplest and most convenient of them is foreach. So what are the differences in operation and performance between them? Which method is usually better to use.

Dec 14, 2016 am 11:13 AM

Class autoloading function

PHP will report a fatal error when you try to use an undefined class. The solution is to add a class, which can be included in a file. After all, you know which class to use. However, PHP provides automatic loading of classes. function, which saves programming time.

Dec 14, 2016 am 11:12 AM

Constructor and destructor

If you declare a function in a class, named __construct, this function will be treated as a constructor and executed when creating an object instance. To be clear, __ is two underscores. Just like any other function Likewise, constructors may have parameters or default values.

Dec 14, 2016 am 11:10 AM

Introduction to commonly used MySQL command line tools

We often use MySQL command line tools. There are some MySQL command line tools that can be used interactively. Each command accepts some options. The long form of the options is prefixed with two hyphens (-).

Dec 14, 2016 am 11:09 AM

mysql command

PHP image functions

There is a set of image functions in PHP that can dynamically generate image data streams in gif format and output them to the server. In order for this set of functions to work, the system must have the support of the gd library.

Dec 14, 2016 am 11:07 AM

A complete list of commonly used MySQL commands

The following are MySQL commands that we often use and are very useful. Below you see #, which means executing the command under the Unix command line, and mysql>, which means you are currently logged in to the MySQL server, and the mysql command is executed on the mysql client. Log in to MySQL. If you want to connect to a remote database, you need to specify the hostname with -h.

Dec 14, 2016 am 11:07 AM

mysql command

Variables of variables, PHP and you

About using variables in PHP. In my program, I need to update multiple records on one page at the same time. After a long period of painful thinking, the concept of variable variable accidentally flashed in my mind.

Dec 14, 2016 am 11:05 AM

How to enter the MySQL command line under Linux

This article introduces: How to enter the MySQL command line under Linux. You can refer to it if necessary.

Dec 14, 2016 am 11:03 AM

Summary of common commands for mysql database under CentOS

Summary of mysql database usage This article mainly records some daily commands of mysql for future query.

Dec 14, 2016 am 11:00 AM

mysql command

MySQL command line formatted output

MySQL's client command line tool has many user-friendly features, and in some aspects it can even be said to be more user-friendly than Oracle's sqlplus. Of course, overall, sqlplus is more convenient. Maybe it's because I am more familiar with sqlplus. Here are some commonly used features of the MySQL command line.

Dec 14, 2016 am 10:59 AM

mysql command