Beispiel #1
0
// checkDatabaseName checks whether the given TableName is unambiguous
// within this source and if it is, qualifies the missing database name.
func (src *dataSourceInfo) checkDatabaseName(tn parser.TableName) (parser.TableName, error) {
	found := false
	if tn.DatabaseName == "" {
		// No database name yet. Try to find one.
		for name := range src.sourceAliases {
			if name.TableName == tn.TableName {
				if found {
					return parser.TableName{}, fmt.Errorf("ambiguous source name: %q", tn.TableName)
				}
				tn.DatabaseName = name.DatabaseName
				found = true
			}
		}
		if !found {
			return parser.TableName{}, fmt.Errorf("source name %q not found in FROM clause", tn.TableName)
		}
		return tn, nil
	}

	// Database given. Check that the name is unambiguous.
	if _, ok := src.sourceAliases[tn]; ok {
		if found {
			return parser.TableName{}, fmt.Errorf("ambiguous source name: %q (within database %q)",
				tn.TableName, tn.DatabaseName)
		}
		found = true
	}

	if !found {
		return parser.TableName{}, fmt.Errorf("table %q not selected in FROM clause", &tn)
	}
	return tn, nil
}
Beispiel #2
0
// checkDatabaseName checks whether the given TableName is unambiguous
// within this source and if it is, qualifies the missing database name.
func (src *dataSourceInfo) checkDatabaseName(tn parser.TableName) (parser.TableName, error) {
	if tn.DatabaseName == "" {
		// No database name yet. Try to find one.
		found := false
		for _, alias := range src.sourceAliases {
			if alias.name.TableName == tn.TableName {
				if found {
					return parser.TableName{}, fmt.Errorf("ambiguous source name: %q", tn.TableName)
				}
				found = true
				tn.DatabaseName = alias.name.DatabaseName
			}
		}
		if !found {
			return parser.TableName{}, fmt.Errorf("source name %q not found in FROM clause", tn.TableName)
		}
		return tn, nil
	}

	// Database given.
	if _, found := src.sourceAliases.srcIdx(tn); !found {
		return parser.TableName{}, fmt.Errorf("table %q not selected in FROM clause", &tn)
	}
	return tn, nil
}