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sql_error.go
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sql_error.go
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// Copyright 2015, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package sqldb
import (
"bytes"
"fmt"
)
const (
// SQLStateGeneral is the SQLSTATE value for "general error".
SQLStateGeneral = "HY000"
)
// SQLError is the error structure returned from calling a db library function
type SQLError struct {
Num int
State string
Message string
Query string
}
// NewSQLError creates a new SQLError.
// If sqlState is left empty, it will default to "HY000" (general error).
func NewSQLError(number int, sqlState string, format string, args ...interface{}) *SQLError {
if sqlState == "" {
sqlState = SQLStateGeneral
}
return &SQLError{
Num: number,
State: sqlState,
Message: fmt.Sprintf(format, args...),
}
}
// Error implements the error interface
func (se *SQLError) Error() string {
buf := &bytes.Buffer{}
buf.WriteString(se.Message)
// Add MySQL errno and SQLSTATE in a format that we can later parse.
// There's no avoiding string parsing because all errors
// are converted to strings anyway at RPC boundaries.
fmt.Fprintf(buf, " (errno %v) (sqlstate %v)", se.Num, se.State)
if se.Query != "" {
fmt.Fprintf(buf, " during query: %s", se.Query)
}
return buf.String()
}
// Number returns the internal MySQL error code.
func (se *SQLError) Number() int {
return se.Num
}
// SQLState returns the SQLSTATE value.
func (se *SQLError) SQLState() string {
return se.State
}