477 lines
9.5 KiB
Go
477 lines
9.5 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 orm
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import (
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"fmt"
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"strings"
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"time"
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)
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// table info struct.
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type dbTable struct {
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id int
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index string
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name string
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names []string
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sel bool
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inner bool
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mi *modelInfo
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fi *fieldInfo
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jtl *dbTable
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}
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// tables collection struct, contains some tables.
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type dbTables struct {
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tablesM map[string]*dbTable
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tables []*dbTable
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mi *modelInfo
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base dbBaser
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skipEnd bool
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}
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// set table info to collection.
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// if not exist, create new.
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func (t *dbTables) set(names []string, mi *modelInfo, fi *fieldInfo, inner bool) *dbTable {
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name := strings.Join(names, ExprSep)
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if j, ok := t.tablesM[name]; ok {
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j.name = name
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j.mi = mi
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j.fi = fi
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j.inner = inner
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} else {
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i := len(t.tables) + 1
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jt := &dbTable{i, fmt.Sprintf("T%d", i), name, names, false, inner, mi, fi, nil}
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t.tablesM[name] = jt
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t.tables = append(t.tables, jt)
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}
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return t.tablesM[name]
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}
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// add table info to collection.
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func (t *dbTables) add(names []string, mi *modelInfo, fi *fieldInfo, inner bool) (*dbTable, bool) {
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name := strings.Join(names, ExprSep)
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if _, ok := t.tablesM[name]; ok == false {
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i := len(t.tables) + 1
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jt := &dbTable{i, fmt.Sprintf("T%d", i), name, names, false, inner, mi, fi, nil}
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t.tablesM[name] = jt
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t.tables = append(t.tables, jt)
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return jt, true
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}
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return t.tablesM[name], false
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}
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// get table info in collection.
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func (t *dbTables) get(name string) (*dbTable, bool) {
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j, ok := t.tablesM[name]
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return j, ok
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}
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// get related fields info in recursive depth loop.
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// loop once, depth decreases one.
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func (t *dbTables) loopDepth(depth int, prefix string, fi *fieldInfo, related []string) []string {
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if depth < 0 || fi.fieldType == RelManyToMany {
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return related
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}
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if prefix == "" {
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prefix = fi.name
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} else {
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prefix = prefix + ExprSep + fi.name
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}
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related = append(related, prefix)
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depth--
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for _, fi := range fi.relModelInfo.fields.fieldsRel {
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related = t.loopDepth(depth, prefix, fi, related)
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}
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return related
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}
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// parse related fields.
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func (t *dbTables) parseRelated(rels []string, depth int) {
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relsNum := len(rels)
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related := make([]string, relsNum)
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copy(related, rels)
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relDepth := depth
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if relsNum != 0 {
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relDepth = 0
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}
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relDepth--
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for _, fi := range t.mi.fields.fieldsRel {
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related = t.loopDepth(relDepth, "", fi, related)
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}
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for i, s := range related {
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var (
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exs = strings.Split(s, ExprSep)
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names = make([]string, 0, len(exs))
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mmi = t.mi
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cancel = true
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jtl *dbTable
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)
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inner := true
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for _, ex := range exs {
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if fi, ok := mmi.fields.GetByAny(ex); ok && fi.rel && fi.fieldType != RelManyToMany {
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names = append(names, fi.name)
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mmi = fi.relModelInfo
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if fi.null || t.skipEnd {
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inner = false
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}
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jt := t.set(names, mmi, fi, inner)
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jt.jtl = jtl
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if fi.reverse {
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cancel = false
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}
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if cancel {
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jt.sel = depth > 0
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if i < relsNum {
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jt.sel = true
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}
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}
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jtl = jt
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} else {
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panic(fmt.Errorf("unknown model/table name `%s`", ex))
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}
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}
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}
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}
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// generate join string.
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func (t *dbTables) getJoinSQL() (join string) {
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Q := t.base.TableQuote()
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for _, jt := range t.tables {
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if jt.inner {
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join += "INNER JOIN "
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} else {
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join += "LEFT OUTER JOIN "
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}
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var (
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table string
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t1, t2 string
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c1, c2 string
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)
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t1 = "T0"
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if jt.jtl != nil {
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t1 = jt.jtl.index
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}
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t2 = jt.index
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table = jt.mi.table
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switch {
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case jt.fi.fieldType == RelManyToMany || jt.fi.fieldType == RelReverseMany || jt.fi.reverse && jt.fi.reverseFieldInfo.fieldType == RelManyToMany:
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c1 = jt.fi.mi.fields.pk.column
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for _, ffi := range jt.mi.fields.fieldsRel {
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if jt.fi.mi == ffi.relModelInfo {
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c2 = ffi.column
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break
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}
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}
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default:
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c1 = jt.fi.column
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c2 = jt.fi.relModelInfo.fields.pk.column
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if jt.fi.reverse {
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c1 = jt.mi.fields.pk.column
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c2 = jt.fi.reverseFieldInfo.column
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}
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}
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join += fmt.Sprintf("%s%s%s %s ON %s.%s%s%s = %s.%s%s%s ", Q, table, Q, t2,
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t2, Q, c2, Q, t1, Q, c1, Q)
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}
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return
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}
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// parse orm model struct field tag expression.
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func (t *dbTables) parseExprs(mi *modelInfo, exprs []string) (index, name string, info *fieldInfo, success bool) {
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var (
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jtl *dbTable
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fi *fieldInfo
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fiN *fieldInfo
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mmi = mi
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)
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num := len(exprs) - 1
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var names []string
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inner := true
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loopFor:
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for i, ex := range exprs {
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var ok, okN bool
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if fiN != nil {
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fi = fiN
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ok = true
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fiN = nil
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}
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if i == 0 {
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fi, ok = mmi.fields.GetByAny(ex)
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}
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_ = okN
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if ok {
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isRel := fi.rel || fi.reverse
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names = append(names, fi.name)
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switch {
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case fi.rel:
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mmi = fi.relModelInfo
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if fi.fieldType == RelManyToMany {
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mmi = fi.relThroughModelInfo
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}
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case fi.reverse:
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mmi = fi.reverseFieldInfo.mi
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}
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if i < num {
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fiN, okN = mmi.fields.GetByAny(exprs[i+1])
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}
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if isRel && (fi.mi.isThrough == false || num != i) {
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if fi.null || t.skipEnd {
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inner = false
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}
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if t.skipEnd && okN || !t.skipEnd {
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if t.skipEnd && okN && fiN.pk {
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goto loopEnd
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}
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jt, _ := t.add(names, mmi, fi, inner)
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jt.jtl = jtl
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jtl = jt
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}
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}
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if num != i {
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continue
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}
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loopEnd:
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if i == 0 || jtl == nil {
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index = "T0"
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} else {
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index = jtl.index
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}
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info = fi
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if jtl == nil {
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name = fi.name
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} else {
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name = jtl.name + ExprSep + fi.name
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}
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switch {
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case fi.rel:
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case fi.reverse:
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switch fi.reverseFieldInfo.fieldType {
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case RelOneToOne, RelForeignKey:
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index = jtl.index
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info = fi.reverseFieldInfo.mi.fields.pk
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name = info.name
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}
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}
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break loopFor
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} else {
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index = ""
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name = ""
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info = nil
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success = false
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return
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}
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}
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success = index != "" && info != nil
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return
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}
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// generate condition sql.
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func (t *dbTables) getCondSQL(cond *Condition, sub bool, tz *time.Location) (where string, params []interface{}) {
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if cond == nil || cond.IsEmpty() {
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return
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}
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Q := t.base.TableQuote()
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mi := t.mi
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for i, p := range cond.params {
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if i > 0 {
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if p.isOr {
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where += "OR "
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} else {
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where += "AND "
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}
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}
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if p.isNot {
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where += "NOT "
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}
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if p.isCond {
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w, ps := t.getCondSQL(p.cond, true, tz)
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if w != "" {
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w = fmt.Sprintf("( %s) ", w)
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}
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where += w
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params = append(params, ps...)
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} else {
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exprs := p.exprs
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num := len(exprs) - 1
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operator := ""
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if operators[exprs[num]] {
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operator = exprs[num]
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exprs = exprs[:num]
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}
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index, _, fi, suc := t.parseExprs(mi, exprs)
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if suc == false {
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panic(fmt.Errorf("unknown field/column name `%s`", strings.Join(p.exprs, ExprSep)))
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}
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if operator == "" {
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operator = "exact"
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}
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operSQL, args := t.base.GenerateOperatorSQL(mi, fi, operator, p.args, tz)
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leftCol := fmt.Sprintf("%s.%s%s%s", index, Q, fi.column, Q)
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t.base.GenerateOperatorLeftCol(fi, operator, &leftCol)
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where += fmt.Sprintf("%s %s ", leftCol, operSQL)
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params = append(params, args...)
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}
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}
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if sub == false && where != "" {
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where = "WHERE " + where
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}
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return
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}
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// generate group sql.
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func (t *dbTables) getGroupSQL(groups []string) (groupSQL string) {
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if len(groups) == 0 {
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return
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}
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Q := t.base.TableQuote()
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groupSqls := make([]string, 0, len(groups))
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for _, group := range groups {
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exprs := strings.Split(group, ExprSep)
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index, _, fi, suc := t.parseExprs(t.mi, exprs)
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if suc == false {
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panic(fmt.Errorf("unknown field/column name `%s`", strings.Join(exprs, ExprSep)))
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}
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groupSqls = append(groupSqls, fmt.Sprintf("%s.%s%s%s", index, Q, fi.column, Q))
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}
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groupSQL = fmt.Sprintf("GROUP BY %s ", strings.Join(groupSqls, ", "))
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return
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}
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// generate order sql.
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func (t *dbTables) getOrderSQL(orders []string) (orderSQL string) {
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if len(orders) == 0 {
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return
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}
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Q := t.base.TableQuote()
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orderSqls := make([]string, 0, len(orders))
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for _, order := range orders {
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asc := "ASC"
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if order[0] == '-' {
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asc = "DESC"
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order = order[1:]
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}
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exprs := strings.Split(order, ExprSep)
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index, _, fi, suc := t.parseExprs(t.mi, exprs)
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if suc == false {
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panic(fmt.Errorf("unknown field/column name `%s`", strings.Join(exprs, ExprSep)))
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}
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orderSqls = append(orderSqls, fmt.Sprintf("%s.%s%s%s %s", index, Q, fi.column, Q, asc))
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}
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orderSQL = fmt.Sprintf("ORDER BY %s ", strings.Join(orderSqls, ", "))
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return
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}
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// generate limit sql.
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func (t *dbTables) getLimitSQL(mi *modelInfo, offset int64, limit int64) (limits string) {
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if limit == 0 {
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limit = int64(DefaultRowsLimit)
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}
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if limit < 0 {
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// no limit
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if offset > 0 {
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maxLimit := t.base.MaxLimit()
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if maxLimit == 0 {
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limits = fmt.Sprintf("OFFSET %d", offset)
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} else {
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limits = fmt.Sprintf("LIMIT %d OFFSET %d", maxLimit, offset)
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}
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}
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} else if offset <= 0 {
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limits = fmt.Sprintf("LIMIT %d", limit)
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} else {
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limits = fmt.Sprintf("LIMIT %d OFFSET %d", limit, offset)
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}
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return
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}
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// crete new tables collection.
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func newDbTables(mi *modelInfo, base dbBaser) *dbTables {
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tables := &dbTables{}
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tables.tablesM = make(map[string]*dbTable)
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tables.mi = mi
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tables.base = base
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return tables
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}
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