golang操作mysql用例

golang操作mysql的demo，直接上代码

package main

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

const (
        userName = "root"
        password = "123456"
        ip       = "127.0.0.1"
        port     = "3306"
        dbName   = "oversea"
)

//var db = &sql.DB{}

func main() {
        insert("test")
        //query()
        //update()
        //query()
        //delete()
}

func createTable(db *sql.DB, table string) {
        sql := `
    CREATE TABLE ` + table + `(
        uid INT(10) NOT NULL AUTO_INCREMENT,
        age INT(10) NOT NULL,
        username VARCHAR(64) NULL DEFAULT NULL,
        created DATE NULL DEFAULT NULL,
        PRIMARY KEY(uid)
    )ENGINE=InnoDB DEFAULT CHARSET=utf8;`

        fmt.Println(sql)
        smt, err := db.Prepare(sql)
        if err != nil {
                fmt.Println(err)
        }
        smt.Exec()
}

func insert(tableName string) error {
        path := strings.Join([]string{userName, ":", password, "@tcp(", ip, ":", port, ")/", dbName, "?charset=utf8"}, "")
        db, err := sql.Open("mysql", path)
        defer db.Close()
        if err != nil {
                return err
        }

        createTable(db, tableName)
        sql := fmt.Sprintf("INSERT INTO %s(uid,age,username) values(NULL,%d,%s)",tableName,"mark", 21)
        _, err = db.Exec(sql)
        if err != nil {
                return err
        }
        return nil
}

func update(tableName string) error {
        path := strings.Join([]string{userName, ":", password, "@tcp(", ip, ":", port, ")/", dbName, "?charset=utf8"}, "")
        db, err := sql.Open("mysql", path)
        defer db.Close()
        if err != nil {
                return err
        }

        createTable(db, tableName)
        sql := fmt.Sprintf("UPDATE %s set username=%s where uid=%d",tableName,"mark", 21)
        _, err = db.Exec(sql)
        if err != nil {
                return err
        }
        return nil
}

func delete(tableName string) error {
        path := strings.Join([]string{userName, ":", password, "@tcp(", ip, ":", port, ")/", dbName, "?charset=utf8"}, "")
        db, err := sql.Open("mysql", path)
        defer db.Close()
        if err != nil {
                return err
        }

        createTable(db, tableName)
        sql := fmt.Sprintf("DELETE FROM %s where uid=%d",tableName,21)
        _, err = db.Exec(sql)
        if err != nil {
                return err
        }
        return nil
}

func query(tableName string) error {
        path := strings.Join([]string{userName, ":", password, "@tcp(", ip, ":", port, ")/", dbName, "?charset=utf8"}, "")
        db, err := sql.Open("mysql", path)
        defer db.Close()
        if err != nil {
                return err
        }

        createTable(db, tableName)
        sql := fmt.Sprintf("SELECT uid,username FROM TEST",tableName)
        rows, _ := db.Query(sql)
        defer rows.Close()
        for rows.Next() {
                var name string
                var id int
                if err := rows.Scan(&id, &name); err != nil {
                        log.Fatal(err)
                }
                fmt.Printf("name:%s ,id:is %d\n", name, id)
        }
        return nil
}