How to use Golang to write MySQL stored procedures

1. Why use MySQL stored procedures

MySQL stored procedures have the following advantages during use:

1. You can rewrite this sentence like this: By running stored procedures on the MySQL server side, you can improve the performance of your application and avoid dynamically generating SQL statements in your application. This can reduce network communication overhead and database pressure.

2. Maintainability and reusability of the program: Stored procedures can be called and reused multiple times, which avoids repeatedly writing the same SQL statements in the application and improves the maintainability of the program. Maintainability and reusability.

3. Data security: Stored procedures can use MySQL's access control mechanism to ensure data security.

2. Use Golang to write MySQL stored procedures

Before using Golang to write MySQL stored procedures, we need to understand the basic structure of MySQL stored procedures and grammar.

1. The basic structure of stored procedures

MySQL stored procedures consist of four components: header, variable declaration, body and procedure end. The head of the statement includes the stored procedure name and parameter declaration, while the body contains the specific SQL statement and program logic.

The following is a simple MySQL stored procedure example:

CREATE PROCEDURE `hello_world`()
BEGIN
     SELECT 'Hello, world!';
END

2. Syntax of stored procedures

Syntax of MySQL stored procedures It is slightly different from ordinary SQL statements. The following is a syntax example of a MySQL stored procedure:

CREATE PROCEDURE procedure_name ([IN | OUT | INOUT] parameter_name data_type[(size)])
BEGIN
    -- procedure body
END

3. Call MySQL stored procedure in Golang

In Golang, we can use Go- The MySQL driver provided by MySQL-Driver is used to connect to the MySQL database and execute stored procedures. The following is an example of Golang calling a MySQL stored procedure:

package main

import (
    "database/sql"
    "fmt"

    _ "github.com/go-sql-driver/mysql"
)

func main() {
    db, err := sql.Open("mysql", "root:password@tcp(127.0.0.1:3306)/test")
    if err != nil {
        panic(err.Error())
    }
    defer db.Close()

    rows, err := db.Query("CALL hello_world()")
    if err != nil {
        panic(err.Error())
    }
    defer rows.Close()

    var result string
    for rows.Next() {
        err := rows.Scan(&result)
        if err != nil {
            panic(err.Error())
        }
    }
    fmt.Println(result)
}

We first connected to the MySQL database using the sql.Open() function. The above code describes this process. Then, we can use the db.Query() method to call the stored procedure, and then use the db.Scan() method to obtain the query results.

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