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Beego/migration/ddl.go
2018-01-04 10:42:39 +08:00

396 lines
11 KiB
Go

// Copyright 2014 beego Author. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package migration
import (
"fmt"
"github.com/astaxie/beego"
)
// Index struct defines the structure of Index Columns
type Index struct {
Name string
}
// Unique struct defines a single unique key combination
type Unique struct {
Definition string
Columns []*Column
}
//Column struct defines a single column of a table
type Column struct {
Name string
Inc string
Null string
Default string
Unsign string
DataType string
remove bool
Modify bool
}
// Foreign struct defines a single foreign relationship
type Foreign struct {
ForeignTable string
ForeignColumn string
OnDelete string
OnUpdate string
Column
}
// RenameColumn struct allows renaming of columns
type RenameColumn struct {
OldName string
OldNull string
OldDefault string
OldUnsign string
OldDataType string
NewName string
Column
}
// CreateTable creates the table on system
func (m *Migration) CreateTable(tablename, engine, charset string, p ...func()) {
m.TableName = tablename
m.Engine = engine
m.Charset = charset
m.ModifyType = "create"
}
// AlterTable set the ModifyType to alter
func (m *Migration) AlterTable(tablename string) {
m.TableName = tablename
m.ModifyType = "alter"
}
// NewCol creates a new standard column and attaches it to m struct
func (m *Migration) NewCol(name string) *Column {
col := &Column{Name: name}
m.AddColumns(col)
return col
}
//PriCol creates a new primary column and attaches it to m struct
func (m *Migration) PriCol(name string) *Column {
col := &Column{Name: name}
m.AddColumns(col)
m.AddPrimary(col)
return col
}
//UniCol creates / appends columns to specified unique key and attaches it to m struct
func (m *Migration) UniCol(uni, name string) *Column {
col := &Column{Name: name}
m.AddColumns(col)
uniqueOriginal := &Unique{}
for _, unique := range m.Uniques {
if unique.Definition == uni {
unique.AddColumnsToUnique(col)
uniqueOriginal = unique
}
}
if uniqueOriginal.Definition == "" {
unique := &Unique{Definition: uni}
unique.AddColumnsToUnique(col)
m.AddUnique(unique)
}
return col
}
//ForeignCol creates a new foreign column and returns the instance of column
func (m *Migration) ForeignCol(colname, foreigncol, foreigntable string) (foreign *Foreign) {
foreign = &Foreign{ForeignColumn: foreigncol, ForeignTable: foreigntable}
foreign.Name = colname
m.AddForeign(foreign)
return foreign
}
//SetOnDelete sets the on delete of foreign
func (foreign *Foreign) SetOnDelete(del string) *Foreign {
foreign.OnDelete = "ON DELETE" + del
return foreign
}
//SetOnUpdate sets the on update of foreign
func (foreign *Foreign) SetOnUpdate(update string) *Foreign {
foreign.OnUpdate = "ON UPDATE" + update
return foreign
}
//Remove marks the columns to be removed.
//it allows reverse m to create the column.
func (c *Column) Remove() {
c.remove = true
}
//SetAuto enables auto_increment of column (can be used once)
func (c *Column) SetAuto(inc bool) *Column {
if inc {
c.Inc = "auto_increment"
}
return c
}
//SetNullable sets the column to be null
func (c *Column) SetNullable(null bool) *Column {
if null {
c.Null = ""
} else {
c.Null = "NOT NULL"
}
return c
}
//SetDefault sets the default value, prepend with "DEFAULT "
func (c *Column) SetDefault(def string) *Column {
c.Default = "DEFAULT " + def
return c
}
//SetUnsigned sets the column to be unsigned int
func (c *Column) SetUnsigned(unsign bool) *Column {
if unsign {
c.Unsign = "UNSIGNED"
}
return c
}
//SetDataType sets the dataType of the column
func (c *Column) SetDataType(dataType string) *Column {
c.DataType = dataType
return c
}
//SetOldNullable allows reverting to previous nullable on reverse ms
func (c *RenameColumn) SetOldNullable(null bool) *RenameColumn {
if null {
c.OldNull = ""
} else {
c.OldNull = "NOT NULL"
}
return c
}
//SetOldDefault allows reverting to previous default on reverse ms
func (c *RenameColumn) SetOldDefault(def string) *RenameColumn {
c.OldDefault = def
return c
}
//SetOldUnsigned allows reverting to previous unsgined on reverse ms
func (c *RenameColumn) SetOldUnsigned(unsign bool) *RenameColumn {
if unsign {
c.OldUnsign = "UNSIGNED"
}
return c
}
//SetOldDataType allows reverting to previous datatype on reverse ms
func (c *RenameColumn) SetOldDataType(dataType string) *RenameColumn {
c.OldDataType = dataType
return c
}
//SetPrimary adds the columns to the primary key (can only be used any number of times in only one m)
func (c *Column) SetPrimary(m *Migration) *Column {
m.Primary = append(m.Primary, c)
return c
}
//AddColumnsToUnique adds the columns to Unique Struct
func (unique *Unique) AddColumnsToUnique(columns ...*Column) *Unique {
unique.Columns = append(unique.Columns, columns...)
return unique
}
//AddColumns adds columns to m struct
func (m *Migration) AddColumns(columns ...*Column) *Migration {
m.Columns = append(m.Columns, columns...)
return m
}
//AddPrimary adds the column to primary in m struct
func (m *Migration) AddPrimary(primary *Column) *Migration {
m.Primary = append(m.Primary, primary)
return m
}
//AddUnique adds the column to unique in m struct
func (m *Migration) AddUnique(unique *Unique) *Migration {
m.Uniques = append(m.Uniques, unique)
return m
}
//AddForeign adds the column to foreign in m struct
func (m *Migration) AddForeign(foreign *Foreign) *Migration {
m.Foreigns = append(m.Foreigns, foreign)
return m
}
//AddIndex adds the column to index in m struct
func (m *Migration) AddIndex(index *Index) *Migration {
m.Indexes = append(m.Indexes, index)
return m
}
//RenameColumn allows renaming of columns
func (m *Migration) RenameColumn(from, to string) *RenameColumn {
rename := &RenameColumn{OldName: from, NewName: to}
m.Renames = append(m.Renames, rename)
return rename
}
//GetSQL returns the generated sql depending on ModifyType
func (m *Migration) GetSQL() (sql string) {
sql = ""
switch m.ModifyType {
case "create":
{
sql += fmt.Sprintf("CREATE TABLE `%s` (", m.TableName)
for index, column := range m.Columns {
sql += fmt.Sprintf("\n `%s` %s %s %s %s %s", column.Name, column.DataType, column.Unsign, column.Null, column.Inc, column.Default)
if len(m.Columns) > index+1 {
sql += ","
}
}
if len(m.Primary) > 0 {
sql += fmt.Sprintf(",\n PRIMARY KEY( ")
}
for index, column := range m.Primary {
sql += fmt.Sprintf(" `%s`", column.Name)
if len(m.Primary) > index+1 {
sql += ","
}
}
if len(m.Primary) > 0 {
sql += fmt.Sprintf(")")
}
for _, unique := range m.Uniques {
sql += fmt.Sprintf(",\n UNIQUE KEY `%s`( ", unique.Definition)
for index, column := range unique.Columns {
sql += fmt.Sprintf(" `%s`", column.Name)
if len(unique.Columns) > index+1 {
sql += ","
}
}
sql += fmt.Sprintf(")")
}
for _, foreign := range m.Foreigns {
sql += fmt.Sprintf(",\n `%s` %s %s %s %s %s", foreign.Name, foreign.DataType, foreign.Unsign, foreign.Null, foreign.Inc, foreign.Default)
sql += fmt.Sprintf(",\n KEY `%s_%s_foreign`(`%s`),", m.TableName, foreign.Column.Name, foreign.Column.Name)
sql += fmt.Sprintf("\n CONSTRAINT `%s_%s_foreign` FOREIGN KEY (`%s`) REFERENCES `%s` (`%s`) %s %s", m.TableName, foreign.Column.Name, foreign.Column.Name, foreign.ForeignTable, foreign.ForeignColumn, foreign.OnDelete, foreign.OnUpdate)
}
sql += fmt.Sprintf(")ENGINE=%s DEFAULT CHARSET=%s;", m.Engine, m.Charset)
break
}
case "alter":
{
sql += fmt.Sprintf("ALTER TABLE `%s` ", m.TableName)
for index, column := range m.Columns {
if !column.remove {
beego.BeeLogger.Info("col")
sql += fmt.Sprintf("\n ADD `%s` %s %s %s %s %s", column.Name, column.DataType, column.Unsign, column.Null, column.Inc, column.Default)
} else {
sql += fmt.Sprintf("\n DROP COLUMN `%s`", column.Name)
}
if len(m.Columns) > index+1 {
sql += ","
}
}
for index, column := range m.Renames {
sql += fmt.Sprintf("CHANGE COLUMN `%s` `%s` %s %s %s %s %s", column.OldName, column.NewName, column.DataType, column.Unsign, column.Null, column.Inc, column.Default)
if len(m.Renames) > index+1 {
sql += ","
}
}
for index, foreign := range m.Foreigns {
sql += fmt.Sprintf("ADD `%s` %s %s %s %s %s", foreign.Name, foreign.DataType, foreign.Unsign, foreign.Null, foreign.Inc, foreign.Default)
sql += fmt.Sprintf(",\n ADD KEY `%s_%s_foreign`(`%s`)", m.TableName, foreign.Column.Name, foreign.Column.Name)
sql += fmt.Sprintf(",\n ADD CONSTRAINT `%s_%s_foreign` FOREIGN KEY (`%s`) REFERENCES `%s` (`%s`) %s %s", m.TableName, foreign.Column.Name, foreign.Column.Name, foreign.ForeignTable, foreign.ForeignColumn, foreign.OnDelete, foreign.OnUpdate)
if len(m.Foreigns) > index+1 {
sql += ","
}
}
sql += ";"
break
}
case "reverse":
{
sql += fmt.Sprintf("ALTER TABLE `%s`", m.TableName)
for index, column := range m.Columns {
if column.remove {
sql += fmt.Sprintf("\n ADD `%s` %s %s %s %s %s", column.Name, column.DataType, column.Unsign, column.Null, column.Inc, column.Default)
} else {
sql += fmt.Sprintf("\n DROP COLUMN `%s`", column.Name)
}
if len(m.Columns) > index+1 {
sql += ","
}
}
if len(m.Primary) > 0 {
sql += fmt.Sprintf("\n DROP PRIMARY KEY,")
}
for index, unique := range m.Uniques {
sql += fmt.Sprintf("\n DROP KEY `%s`", unique.Definition)
if len(m.Uniques) > index+1 {
sql += ","
}
}
for index, column := range m.Renames {
sql += fmt.Sprintf("\n CHANGE COLUMN `%s` `%s` %s %s %s %s", column.NewName, column.OldName, column.OldDataType, column.OldUnsign, column.OldNull, column.OldDefault)
if len(m.Renames) > index+1 {
sql += ","
}
}
for _, foreign := range m.Foreigns {
sql += fmt.Sprintf("\n DROP KEY `%s_%s_foreign`", m.TableName, foreign.Column.Name)
sql += fmt.Sprintf(",\n DROP FOREIGN KEY `%s_%s_foreign`", m.TableName, foreign.Column.Name)
sql += fmt.Sprintf(",\n DROP COLUMN `%s`", foreign.Name)
}
sql += ";"
}
case "delete":
{
sql += fmt.Sprintf("DROP TABLE IF EXISTS `%s`;", m.TableName)
}
}
return
}