gf/database/gdb/gdb_model_fields.go

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// Copyright 2017 gf Author(https://github.com/gogf/gf). All Rights Reserved.
//
// This Source Code Form is subject to the terms of the MIT License.
// If a copy of the MIT was not distributed with this file,
// You can obtain one at https://github.com/gogf/gf.
package gdb
import (
"fmt"
"github.com/gogf/gf/container/gset"
"github.com/gogf/gf/text/gstr"
)
// Filter marks filtering the fields which does not exist in the fields of the operated table.
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// Note that this function supports only single table operations.
func (m *Model) Filter() *Model {
if gstr.Contains(m.tables, " ") {
panic("function Filter supports only single table operations")
}
model := m.getModel()
model.filter = true
return model
}
// Fields sets the operation fields of the model, multiple fields joined using char ','.
func (m *Model) Fields(fields string) *Model {
model := m.getModel()
model.fields = fields
return model
}
// FieldsEx sets the excluded operation fields of the model, multiple fields joined using char ','.
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// Note that this function supports only single table operations.
func (m *Model) FieldsEx(fields string) *Model {
if gstr.Contains(m.tables, " ") {
panic("function FieldsEx supports only single table operations")
}
tableFields, err := m.db.TableFields(m.tables)
if err != nil {
panic(err)
}
if len(tableFields) == 0 {
panic(fmt.Sprintf(`empty table fields for table "%s"`, m.tables))
}
model := m.getModel()
model.fieldsEx = fields
fieldsExSet := gset.NewStrSetFrom(gstr.SplitAndTrim(fields, ","))
fieldsArray := make([]string, len(tableFields))
for k, v := range tableFields {
fieldsArray[v.Index] = k
}
model.fields = ""
for _, k := range fieldsArray {
if fieldsExSet.Contains(k) {
continue
}
if len(model.fields) > 0 {
model.fields += ","
}
model.fields += k
}
model.fields = model.db.QuoteString(model.fields)
return model
}
// FieldsStr retrieves and returns all fields from the table, joined with char ','.
// The optional parameter <prefix> specifies the prefix for each field, eg: FieldsStr("u.").
func (m *Model) FieldsStr(prefix ...string) string {
prefixStr := ""
if len(prefix) > 0 {
prefixStr = prefix[0]
}
tableFields, err := m.db.TableFields(m.tables)
if err != nil {
panic(err)
}
if len(tableFields) == 0 {
panic(fmt.Sprintf(`empty table fields for table "%s"`, m.tables))
}
fieldsArray := make([]string, len(tableFields))
for k, v := range tableFields {
fieldsArray[v.Index] = k
}
newFields := ""
for _, k := range fieldsArray {
if len(newFields) > 0 {
newFields += ","
}
newFields += prefixStr + k
}
newFields = m.db.QuoteString(newFields)
return newFields
}
// FieldsExStr retrieves and returns fields which are not in parameter <fields> from the table,
// joined with char ','.
// The parameter <fields> specifies the fields that are excluded.
// The optional parameter <prefix> specifies the prefix for each field, eg: FieldsExStr("id", "u.").
func (m *Model) FieldsExStr(fields string, prefix ...string) string {
prefixStr := ""
if len(prefix) > 0 {
prefixStr = prefix[0]
}
tableFields, err := m.db.TableFields(m.tables)
if err != nil {
panic(err)
}
if len(tableFields) == 0 {
panic(fmt.Sprintf(`empty table fields for table "%s"`, m.tables))
}
fieldsExSet := gset.NewStrSetFrom(gstr.SplitAndTrim(fields, ","))
fieldsArray := make([]string, len(tableFields))
for k, v := range tableFields {
fieldsArray[v.Index] = k
}
newFields := ""
for _, k := range fieldsArray {
if fieldsExSet.Contains(k) {
continue
}
if len(newFields) > 0 {
newFields += ","
}
newFields += prefixStr + k
}
newFields = m.db.QuoteString(newFields)
return newFields
}