如果不存在行,QueryRow().Scan()返回错误 我想从sql数据库中获取一行。= nil {}问题:我发现的唯一方法是使用Query而不是QueryRow,但这不方便,因为每次要获取单个行时,我都必须添加for rows.Next() { ..。 浏览4提问于2017-03-29得票数24 回答已采纳 ...
=nil{fmt.Fprintf(os.Stderr,"Unable to connect to database: %v\n",err)os.Exit(1) }deferconn.Close(context.Background())varnamestringvarweightint64err=conn.QueryRow(context.Background(),"select name, weight from widgets where id=$1",42).Scan(&name,&weight)iferr!=nil{fmt.Fprintf(os....
本文以PostGIS的Geometry类型为例。 需要实现:Set、Get、AssignTo、DecodeText、DecodeBinary、EncodeText、EncodeBinary、Scan、Value、MarshalJSON、UnmarshalJSON方法。 //PostGIS Geometry实现,目前仅支持Point2Dimport("bytes""database/sql/driver""encoding/binary""encoding/hex""errors""fmt""github.com/jackc/pgty...
可见上述代码中,仅仅是简单的Next() Scan()然后回调pgx.RowToMap这个函数生成map,我不需要它一次性地给我map的切片,但是我可以轻松将他实现的过程移植到我的代码中,至此问题完美解决了。至于pgx.RowToMap这个方法的实现,其实非常简单,下面就是其源代码: // RowToMap returns a map scanned from row. funcRowToMa...
github.com/georgysavva/scanyLibrary for scanning data from a database into Go structs and more.About PostgreSQL driver and toolkit for Go Resources Readme License MIT license Activity Stars 0 stars Watchers 0 watching Forks 0 forks Report repository Releases 50 tags Packages No ...
fmt.Println('Failed to scan row:', err) return } fmt.Println('ID:', id, 'Name:', name) if rows.Err() != nil { fmt.Println('Error occurred while iterating over rows:', rows.Err()) return ``` 上面的代码执行了一个简单的SELECT查询,并遍历了结果集中的每一行。可以根据需要调整查询...
Status: pgtype.Present} err = m.DB.QueryRow(context.Background(), stmt, title, content, expiresInterval).Scan(&id) if err != nil { if errors.Is(err, sql.ErrNoRows) { return 0, models.ErrNoRecord } else { return 0, err } } return 0, nil } 反对 回复 2022-11-08 2...
3. Perform a scan using the first receiver. 4. Turn on the first transmitter and sync it to the receiver. 5. Repeat for each system. ◦ Important: After syncing each transmitter, leave it on so that scans from the other receivers will not select that channel. ◦ Be sure only one ...
err := rows.Scan(&rowArray.Id, &rowArray.Language, &rowArray.Name) if err != nil { log.Fatal(err) } } fmt.Println(rowArray) return c.JSON(http.StatusOK, rowArray) } Expected Output id | language | name ---+---+--- 1 | none | Plaintext 2 | go | Golang...
Scan(dest ...any) error // Values returns the decoded row values. As with Scan(), it is an error to // call Values without first calling Next() and checking that it returned // true. Values() ([]any, error) // RawValues returns the unparsed bytes of the row values. The ...