How to use escape characters in mysql

1. What is an escape character

The escape character is a special character used to tell the computer how to handle some special characters or string. In Mysql, escape characters are used to process some special characters, such as single quotes, double quotes, backslashes, etc. Commonly used escape characters in Mysql include:,',",
,, etc.

2. Use of escape characters

2.1 Single quotes and double quotes

In Mysql, single quotes and double quotes are used to represent strings. When single quotes or double quotes need to be used in a string, they must be escaped using an escape character. Escape. For example:

INSERT INTO t_user (username, password) VALUES (''test'', '"123456"');

The above SQL statement inserts a record, the user name is 'test', the password is "123456", single quotes and double quotes are used in the string, and escape is required. Characters to escape them.

2.2 Backslash

Backslash is also an escape character in Mysql, used to represent special characters or backslashes in strings. For example :

SELECT * FROM t_user WHERE username LIKE '%_%' ESCAPE '';

In order to handle the special character underscore, the SQL statement uses escape characters to find users that contain underscore _ in the user name. This sentence can be rewritten as: By using the ESCAPE clause after the LIKE operator And specify the escape character to avoid conflicts with this character.

2.3 Line feed, carriage return and tab characters

In Mysql, line feed character
, carriage return and tab characters are also an escape character used to represent special characters. For example:

INSERT INTO t_user (username, password, description) VALUES ('test', '123456', 'Hello
World!    Welcome to Mysql!');

The above SQL statement inserts a record with the user name test, password 123456, and description "Hello
World! Welcome to Mysql!", where
represents a newline character and represents a tab character.

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