> For the complete documentation index, see [llms.txt](https://mariadb.com/docs/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mariadb.com/docs/connectors/mariadb-connector-c/api-functions/mysql_real_escape_string.md).

# mysql\_real\_escape\_string

## Syntax

```c
unsigned long mysql_real_escape_string(MYSQL * mysql,
                                       char * to,
                                       const char * from,
                                       unsigned long);
```

## Parameters

* `mysql` - a MySQL handle, which was previously allocated by [mysql\_init()](/docs/connectors/mariadb-connector-c/api-functions/mysql_init.md) or [mysql\_real\_connect()](/docs/connectors/mariadb-connector-c/api-functions/mysql_real_connect.md).
* `to` - buffer for the encoded string. The size of this buffer must be length \* 2 + 1 bytes: in the worst case every character of the from string needs to be escaped. Additionally, a trailing 0 character will be appended.
* `from` - a string which will be encoded by `mysql_real_escape_string()`.
* `long` - the length of the `from` string.

## Description

This function is used to create a legal SQL string that you can use in an SQL statement. The given string is encoded to an escaped SQL string, taking into account the current character set of the connection.

## Return Value

Returns the length of the encoded (to) string.

## See Also

* [mysql\_escape\_string()](/docs/connectors/mariadb-connector-c/api-functions/mysql_escape_string.md)
* [mysql\_hex\_string()](/docs/connectors/mariadb-connector-c/api-functions/mysql_hex_string.md)

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