学习MSSQL使用转义符技巧（mssql 转义符）

The

MSSQL is a very powerful database management system and can be used to store and manage large amounts of data. In order to ensure that data is manipulated properly and that queries are done correctly, it’s important to know how to use escape characters.

Firstly, what is an escape character? In MSSQL, an escape character is a character or set of characters that are designed to modify a query by representing a special meaning, such as a wildcard, a space, a quote or an order of control.

For example, the backslash ‘\’ is used to escape all other characters to denote special meaning, or to denote the start of a new line.

If you are writing an MSSQL query with text or values in it, you may encounter a situation where you want to include characters that are normally prohibited by the system. In which case, you can use the escape character to modify the syntax and include the otherwise prohibited characters.

For instance, let’s say you wanted to search a table for rows that contain a string ending with a quotation mark, you need to escape the quotation mark, like so:

SELECT * FROM Table_Name WHERE Name LIKE ‘%”%’;

This syntax will allow you to search for strings that end with a quotation mark.

Alternatively, you can also use the escape character to denote a wildcard. Wildcards are used to match any number of characters in a query. For example, if you wanted to search for a row that contains the string ‘test’ anywhere in the row, you could use the following query:

SELECT * FROM Table_Name WHERE Name LIKE ‘%\test%’;

This syntax tells the query that the ‘test’ string can contain any number of characters before or after it.

Finally, you can also use escape characters to denote the order of control. In MSSQL, order of control can be denoted using brackets or parentheses. For example, if you were constructing a query that executes different commands based on a specific condition, you can use the escape character (or brackets) to denote order of control like so:

IF (‘condition’) \

BEGIN \

\

END

As you can see, escape characters play a very important role in the MSSQL query syntax and are essential for manipulating large quantities of data. Therefore, it’s important to understand how to use them properly. This will not only help you construct correct queries, but also make sure that you are getting the data that you need from your database.