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