Golang Type.FieldByNameFunc方法代码示例

func columnToFieldIndex(m *DbMap, t reflect.Type, cols []string) ([][]int, error) {
	colToFieldIndex := make([][]int, len(cols))

	// check if type t is a mapped table - if so we'll
	// check the table for column aliasing below
	tableMapped := false
	table := tableOrNil(m, t)
	if table != nil {
		tableMapped = true
	}

	// Loop over column names and find field in i to bind to
	// based on column name. all returned columns must match
	// a field in the i struct
	missingColNames := []string{}
	for x := range cols {
		colName := strings.ToLower(cols[x])
		field, found := t.FieldByNameFunc(func(fieldName string) bool {
			field, _ := t.FieldByName(fieldName)
			cArguments := strings.Split(field.Tag.Get("db"), ",")
			fieldName = cArguments[0]

			if fieldName == "-" {
				return false
			} else if fieldName == "" {
				fieldName = field.Name
			}
			if tableMapped {
				colMap := colMapOrNil(table, fieldName)
				if colMap != nil {
					fieldName = colMap.ColumnName
				}
			}
			return colName == strings.ToLower(fieldName)
		})
		if found {
			colToFieldIndex[x] = field.Index
		}
		if colToFieldIndex[x] == nil {
			missingColNames = append(missingColNames, colName)
		}
	}
	if len(missingColNames) > 0 {
		return colToFieldIndex, &NoFieldInTypeError{
			TypeName:        t.Name(),
			MissingColNames: missingColNames,
		}
	}
	return colToFieldIndex, nil
}

func columnToFieldIndex(m *DbMap, t reflect.Type, cols []string) ([][]int, error) {
	colToFieldIndex := make([][]int, len(cols))

	// check if type t is a mapped table - if so we'll
	// check the table for column aliasing below
	tableMapped := false
	table := tableOrNil(m, t)
	if table != nil {
		tableMapped = true
	}

	// Loop over column names and find field in i to bind to
	// based on column name. all returned columns must match
	// a field in the i struct
	for x := range cols {
		colName := strings.ToLower(cols[x])

		field, found := t.FieldByNameFunc(func(fieldName string) bool {
			field, _ := t.FieldByName(fieldName)
			fieldName = field.Tag.Get("db")

			if fieldName == "-" {
				return false
			} else if fieldName == "" {
				fieldName = field.Name
			}
			if tableMapped {
				colMap := colMapOrNil(table, fieldName)
				if colMap != nil {
					fieldName = colMap.ColumnName
				}
			}

			return colName == strings.ToLower(fieldName)
		})
		if found {
			colToFieldIndex[x] = field.Index
		}
		if colToFieldIndex[x] == nil {
			return nil, fmt.Errorf("gorp: No field %s in type %s", colName, t.Name())
		}
	}
	return colToFieldIndex, nil
}

func makeColToFieldIndex(t reflect.Type, cols []string) [][]int {
	var colToFieldIndex = make([][]int, len(cols))

	for x := range cols {
		colName := strings.ToLower(cols[x])
		field, found := t.FieldByNameFunc(func(fieldName string) bool {
			field, _ := t.FieldByName(fieldName)
			tags := strings.Split(field.Tag.Get("db"), ", ")
			dbNameFromTag := tags[0]
			if dbNameFromTag == "" {
				return strings.ToLower(field.Name) == colName
			}
			return colName == dbNameFromTag
		})
		if found {
			colToFieldIndex[x] = field.Index
		}
	}

	return colToFieldIndex
}

//.........这里部分代码省略.........
				}
			}
		}
	}

	// Find end element.
	// Process sub-elements along the way.
Loop:
	for {
		var savedOffset int
		if saveXML.IsValid() {
			savedOffset = p.savedOffset()
		}
		tok, err := p.Token()
		if err != nil {
			return err
		}
		switch t := tok.(type) {
		case StartElement:
			// Sub-element.
			// Look up by tag name.
			if sv.IsValid() {
				k := fieldName(t.Name.Local)

				if fieldPaths != nil {
					if _, found := fieldPaths[k]; found {
						if err := p.unmarshalPaths(sv, fieldPaths, k, &t); err != nil {
							return err
						}
						continue Loop
					}
				}

				match := func(s string) bool {
					// check if the name matches ignoring case
					if strings.ToLower(s) != k {
						return false
					}
					// now check that it's public
					c, _ := utf8.DecodeRuneInString(s)
					return unicode.IsUpper(c)
				}

				f, found := styp.FieldByNameFunc(match)
				if !found { // fall back to mop-up field named "Any"
					f, found = styp.FieldByName("Any")
				}
				if found {
					if err := p.unmarshal(sv.FieldByIndex(f.Index), &t); err != nil {
						return err
					}
					continue Loop
				}
			}
			// Not saving sub-element but still have to skip over it.
			if err := p.Skip(); err != nil {
				return err
			}

		case EndElement:
			if saveXML.IsValid() {
				saveXMLData = p.saved.Bytes()[saveXMLIndex:savedOffset]
				if saveXMLIndex == 0 {
					p.saved = nil
				}
			}
			break Loop

		case CharData:
			if saveData.IsValid() {
				data = append(data, t...)
			}

		case Comment:
			if saveComment.IsValid() {
				comment = append(comment, t...)
			}
		}
	}

	if err := copyValue(saveData, data); err != nil {
		return err
	}

	switch t := saveComment; t.Kind() {
	case reflect.String:
		t.SetString(string(comment))
	case reflect.Slice:
		t.Set(reflect.ValueOf(comment))
	}

	switch t := saveXML; t.Kind() {
	case reflect.String:
		t.SetString(string(saveXMLData))
	case reflect.Slice:
		t.Set(reflect.ValueOf(saveXMLData))
	}

	return nil
}