ipbl/vendor/xorm.io/xorm/internal/statements/expr.go

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2021-11-07 20:44:48 +01:00
// Copyright 2019 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package statements
import (
"fmt"
"strings"
"xorm.io/builder"
"xorm.io/xorm/schemas"
)
// ErrUnsupportedExprType represents an error with unsupported express type
type ErrUnsupportedExprType struct {
tp string
}
func (err ErrUnsupportedExprType) Error() string {
return fmt.Sprintf("Unsupported expression type: %v", err.tp)
}
// Expr represents an SQL express
type Expr struct {
ColName string
Arg interface{}
}
// WriteArgs writes args to the writer
func (expr *Expr) WriteArgs(w *builder.BytesWriter) error {
switch arg := expr.Arg.(type) {
case *builder.Builder:
if _, err := w.WriteString("("); err != nil {
return err
}
if err := arg.WriteTo(w); err != nil {
return err
}
if _, err := w.WriteString(")"); err != nil {
return err
}
case string:
if arg == "" {
arg = "''"
}
if _, err := w.WriteString(fmt.Sprintf("%v", arg)); err != nil {
return err
}
default:
if _, err := w.WriteString("?"); err != nil {
return err
}
w.Append(arg)
}
return nil
}
type exprParams []Expr
func (exprs exprParams) ColNames() []string {
var cols = make([]string, 0, len(exprs))
for _, expr := range exprs {
cols = append(cols, expr.ColName)
}
return cols
}
func (exprs *exprParams) Add(name string, arg interface{}) {
*exprs = append(*exprs, Expr{name, arg})
}
func (exprs exprParams) IsColExist(colName string) bool {
for _, expr := range exprs {
if strings.EqualFold(schemas.CommonQuoter.Trim(expr.ColName), schemas.CommonQuoter.Trim(colName)) {
return true
}
}
return false
}
func (exprs exprParams) WriteArgs(w *builder.BytesWriter) error {
for i, expr := range exprs {
if err := expr.WriteArgs(w); err != nil {
return err
}
if i != len(exprs)-1 {
if _, err := w.WriteString(","); err != nil {
return err
}
}
}
return nil
}