mysql character escape

In MySQL, it is sometimes necessary to escape some special characters. For example, when we want to insert a string with single quotes into the database, we need to use character escape.

MySQL provides an escape character () that can be used to escape some special characters, thereby indicating that they are not special characters in SQL statements, but ordinary characters. In MySQL, special characters that need to be escaped include single quotes ('), double quotes ("), backslash (), etc.

Commonly used escape characters are as follows:

• ': single quote
• ”: double quote
• \: backslash
• : backspace
• : newline
• : represents carriage return
• : represents tab character

The method of using escape characters is very simple, just add it before the special characters that need to be escaped One backslash and that's it. For example, if you want to insert a string containing single quotes, you can write like this:

INSERT INTO table_name (column_name) VALUES('It's a good day.')

Among them, for the single quotes, we use the escape character () to escape it, thus indicating that it is an ordinary characters, rather than special characters in SQL statements. Similarly, double quotes and backslashes can also be escaped using escape characters.

In addition to using escape characters when inserting data, escape characters can also be used in operations such as updating data, deleting data, and querying data. For example, when querying a record containing single quotes in its name, you can write:

SELECT * FROM table_name WHERE name='Tom's bike'

In this way, you can correctly query the name containing single quotes.

It should be noted that if escape characters are used in SQL statements, these escape characters also need to be escaped. For example, when inserting a string containing backslashes, you need to write:

INSERT INTO table_name (column_name) VALUES('C:\Program Files\MySQL\')

where two backslashes represent the escape of a backslash. Otherwise, MySQL will interpret them as escape characters, leading to incorrect results.

In short, using escape characters in MySQL can help us solve many problems such as string insertion and query, but we need to pay attention to the details of use to avoid errors.

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