Пример #1
0
// parseComplete parses the "command tag" from a CommandComplete message, and
// returns the number of rows affected (if applicable) and a string
// identifying only the command that was executed, e.g. "ALTER TABLE".  If the
// command tag could not be parsed, parseComplete panics.
func (cn *conn) parseComplete(commandTag string) (driver.Result, string) {
	commandsWithAffectedRows := []string{
		"SELECT ",
		// INSERT is handled below
		"UPDATE ",
		"DELETE ",
		"FETCH ",
		"MOVE ",
		"COPY ",
	}

	var affectedRows *string
	for _, tag := range commandsWithAffectedRows {
		if strings.HasPrefix(commandTag, tag) {
			t := commandTag[len(tag):]
			affectedRows = &t
			commandTag = tag[:len(tag)-1]
			break
		}
	}
	// INSERT also includes the oid of the inserted row in its command tag.
	// Oids in user tables are deprecated, and the oid is only returned when
	// exactly one row is inserted, so it's unlikely to be of value to any
	// real-world application and we can ignore it.
	if affectedRows == nil && strings.HasPrefix(commandTag, "INSERT ") {
		parts := strings.Split(commandTag, " ")
		if len(parts) != 3 {
			cn.bad = true
			errorf("unexpected INSERT command tag %s", commandTag)
		}
		affectedRows = &parts[len(parts)-1]
		commandTag = "INSERT"
	}
	// There should be no affected rows attached to the tag, just return it
	if affectedRows == nil {
		return driver.RowsAffected(0), commandTag
	}
	n, err := strconv.ParseInt(*affectedRows, 10, 64)
	if err != nil {
		cn.bad = true
		errorf("could not parse commandTag: %s", err)
	}
	return driver.RowsAffected(n), commandTag
}
Пример #2
0
// When doInsert is true, add the row to the table.
// When doInsert is false do prep-work and error checking, but don't
// actually add the row to the table.
func (s *fakeStmt) execInsert(args []driver.Value, doInsert bool) (driver.Result, error) {
	db := s.c.db
	if len(args) != s.placeholders {
		panic("error in pkg db; should only get here if size is correct")
	}
	db.mu.Lock()
	t, ok := db.table(s.table)
	db.mu.Unlock()
	if !ok {
		return nil, fmt.Errorf("fakedb: table %q doesn't exist", s.table)
	}

	t.mu.Lock()
	defer t.mu.Unlock()

	var cols []interface{}
	if doInsert {
		cols = make([]interface{}, len(t.colname))
	}
	argPos := 0
	for n, colname := range s.colName {
		colidx := t.columnIndex(colname)
		if colidx == -1 {
			return nil, fmt.Errorf("fakedb: column %q doesn't exist or dropped since prepared statement was created", colname)
		}
		var val interface{}
		if strvalue, ok := s.colValue[n].(string); ok && strvalue == "?" {
			val = args[argPos]
			argPos++
		} else {
			val = s.colValue[n]
		}
		if doInsert {
			cols[colidx] = val
		}
	}

	if doInsert {
		t.rows = append(t.rows, &row{cols: cols})
	}
	return driver.RowsAffected(1), nil
}
Пример #3
0
// Exec inserts values into the COPY stream. The insert is asynchronous
// and Exec can return errors from previous Exec calls to the same
// COPY stmt.
//
// You need to call Exec(nil) to sync the COPY stream and to get any
// errors from pending data, since Stmt.Close() doesn't return errors
// to the user.
func (ci *copyin) Exec(v []driver.Value) (r driver.Result, err error) {
	if ci.closed {
		return nil, errCopyInClosed
	}

	if ci.cn.bad {
		return nil, driver.ErrBadConn
	}
	defer ci.cn.errRecover(&err)

	if ci.isErrorSet() {
		return nil, ci.err
	}

	if len(v) == 0 {
		err = ci.Close()
		ci.closed = true
		return nil, err
	}

	numValues := len(v)
	for i, value := range v {
		ci.buffer = appendEncodedText(&ci.cn.parameterStatus, ci.buffer, value)
		if i < numValues-1 {
			ci.buffer = append(ci.buffer, '\t')
		}
	}

	ci.buffer = append(ci.buffer, '\n')

	if len(ci.buffer) > ciBufferFlushSize {
		ci.flush(ci.buffer)
		// reset buffer, keep bytes for message identifier and length
		ci.buffer = ci.buffer[:5]
	}

	return driver.RowsAffected(0), nil
}