mysql - How to insert a tuple only if it is not available in the table in Golang? -


in use case, want write function insert row in table in golang if row not available already. using mysql , github.com/go-sql-driver/mysql. getting error while try insert through function. able insert running through mysql console. here function definition,

    func addtag(t *objects.tag) {      //get connection object     db, err := getdbconnection()     defer db.close()      // prepare statement inserting data     stmtins, err := db.prepare("insert tag (tag_id, tag_name, metatag_id) select * (select null, ?, ?) tmp not exists ( select tag_name tag tag_name = ? ) limit 1")     if err != nil {         fmt.println("fatal  ", time.now(), "error in prepare statement tag insert ")         panic(err.error())      }      defer stmtins.close()                         // close statement when leave main() / program terminates     _, err = stmtins.exec(t.tagname, t.metatagid, t.tagname) // insert tuples      if err != nil {         fmt.println("fatal  ", time.now(), "error in insert tag ")         panic(err.error())      }    }

edit 1 : getting following error,

fatal    2015-06-14 17:13:15.631487042 -0700 pdt error in insert tag panic: error 1136: column count doesn't match value count @ row 1  goroutine 1 [running]: main.addtag(0x1112e1a0, 0x0, 0x0)

could me on this? thank you

"column count doesn't match value count" means didn't provide value column in table doesn't have default value.

check table schema (describe tag;) , ensure providing values other columns, or have default value.


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