golang mysql escape

When using Golang to operate MySQL, avoiding SQL injection attacks is an important issue. To ensure the security of SQL statements, escape the required characters before sending them to MySQL so that these characters will not be interpreted as part of the SQL statement, thereby preventing SQL injection attacks from occurring.

In Golang, handling MySQL escapes can be accomplished by using the Escape method in the MySQL driver, which returns an escaped string.

Below we use an example to demonstrate how to use the Escape method in the MySQL driver for MySQL escape. We assume that we want to query the search results for the value passed by the user through the URL as a keyword, for example:

SELECT * FROM users WHERE name = '[输入的关键字]';

Assume that this keyword is a string object, and there may be single quotes, double quotes or other special symbols. These Special symbols may lead to SQL injection attacks.

The first method is to manually filter these special symbols and use the Replace method of Golang's strings library or the replacer method of regular expressions to escape. If the manual filtering is not thorough, not only will it be impossible to prevent SQL injection, but it may even be possible. The characters entered by the user will be over-processed, resulting in invalid characters or errors.

Therefore, we generally use the Escape method in the MySQL driver for internal processing. This method will escape all special characters (such as single quotes, double quotes, backslashes) into safe characters to ensure that the query Statement security. The following is an escape code example based on the MySQL driver:

import (
    "database/sql"
    _ "github.com/go-sql-driver/mysql"
    "fmt"
)

func main() {
    username := "root"
    password := ""
    host := "localhost"
    port := "3306"
    dbName := "testdb"
    db, err := sql.Open("mysql", fmt.Sprintf("%s:%s@tcp(%s:%s)/%s?charset=utf8", username, password, host, port, dbName))
    if err != nil {
        panic(err)
    }
    defer db.Close()

    keyword := "' OR 1=1 #"
    query := fmt.Sprintf("SELECT * FROM users WHERE name = '%s'", db.Escape(keyword))
    rows, err := db.Query(query)
    if err != nil {
        panic(err)
    }
    defer rows.Close()

    // 处理查询结果
}

In the above example, we use Golang's database/sql package to connect to the MySQL database and create a db object, which contains the information we need Information about the connected MySQL database. We used the Escape method to process the input keywords. By using this method, we have escaped all special characters when generating SQL query statements, so we can avoid SQL injection attacks.

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