How to connect to database in golang

How to connect to the database in golang

1. To connect to the database, you first need to have a connection driver and install the driver

go get github.com/go-sql-driver/mysql

After successful download, it will be saved to the src subdirectory under the GOPATH directory of the current system

(Free learning video tutorial recommended:mysql video tutorial)

2. Connect to the database

● Build a connection, the format is: "Username: Password @tcp (IP: port)/database?charset=utf8"

● Open the database , the former is the driver name, so it needs to be imported:

“github.com/go-sql-driver/mysql”

● Set the maximum number of database connections and set the maximum number of idle connections in the database

● Verify the connection: use the Ping() function

3. Golang database connection sample code:

import ( "database/sql" "fmt" "strings" // 安装方式: go get -u github.com/go-sql-driver/mysql _ "github.com/go-sql-driver/mysql" ) var ( dbhostsip = "127.0.0.1:3306" dbusername = "root" dbpassword = "123456" dbname = "chat" ) // 初始化数据库 func InitDB() (*sql.DB, error) { //构建连接信息 dbinfo := strings.Join([]string{dbusername, ":", dbpassword, "@tcp(", dbhostsip, ")/", dbname, "?charset=utf8"}, "") fmt.Println(dbinfo) //打开数据库，前面是驱动名称，所以要导入:mysql驱动github.com/go-sql-driver/mysql dbins, err := sql.Open("mysql", dbinfo) if nil != err { fmt.Println("Open Database Error:", err) return nil, err } // 设置数据库的最大连接数 dbins.SetConnMaxLifetime(100) // 设置数据库最大的闲置连接数 dbins.SetMaxIdleConns(10) // 验证连接 if err = dbins.Ping(); nil != err { fmt.Println("Open Database Fail,Error:", err) return nil, err } fmt.Println("Connect Success!!!") return dbins, nil }

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