414 lines
10 KiB
Go
414 lines
10 KiB
Go
// Copyright 2019 The Xorm Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package statements
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import (
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"errors"
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"fmt"
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"reflect"
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"strings"
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"xorm.io/builder"
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"xorm.io/xorm/schemas"
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)
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// GenQuerySQL generate query SQL
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func (statement *Statement) GenQuerySQL(sqlOrArgs ...interface{}) (string, []interface{}, error) {
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if len(sqlOrArgs) > 0 {
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return statement.ConvertSQLOrArgs(sqlOrArgs...)
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}
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if statement.RawSQL != "" {
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return statement.GenRawSQL(), statement.RawParams, nil
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}
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if len(statement.TableName()) <= 0 {
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return "", nil, ErrTableNotFound
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}
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if err := statement.ProcessIDParam(); err != nil {
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return "", nil, err
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}
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buf := builder.NewWriter()
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if err := statement.writeSelect(buf, statement.genSelectColumnStr(), false); err != nil {
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return "", nil, err
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}
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return buf.String(), buf.Args(), nil
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}
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// GenSumSQL generates sum SQL
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func (statement *Statement) GenSumSQL(bean interface{}, columns ...string) (string, []interface{}, error) {
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if statement.RawSQL != "" {
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return statement.GenRawSQL(), statement.RawParams, nil
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}
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if err := statement.SetRefBean(bean); err != nil {
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return "", nil, err
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}
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sumStrs := make([]string, 0, len(columns))
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for _, colName := range columns {
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if !strings.Contains(colName, " ") && !strings.Contains(colName, "(") {
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colName = statement.quote(colName)
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} else {
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colName = statement.ReplaceQuote(colName)
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}
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sumStrs = append(sumStrs, fmt.Sprintf("COALESCE(sum(%s),0)", colName))
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}
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if err := statement.MergeConds(bean); err != nil {
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return "", nil, err
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}
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buf := builder.NewWriter()
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if err := statement.writeSelect(buf, strings.Join(sumStrs, ", "), true); err != nil {
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return "", nil, err
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}
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return buf.String(), buf.Args(), nil
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}
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// GenGetSQL generates Get SQL
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func (statement *Statement) GenGetSQL(bean interface{}) (string, []interface{}, error) {
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var isStruct bool
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if bean != nil {
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v := rValue(bean)
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isStruct = v.Kind() == reflect.Struct
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if isStruct {
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if err := statement.SetRefBean(bean); err != nil {
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return "", nil, err
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}
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}
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}
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columnStr := statement.ColumnStr()
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if len(statement.SelectStr) > 0 {
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columnStr = statement.SelectStr
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} else {
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// TODO: always generate column names, not use * even if join
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if len(statement.joins) == 0 {
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if len(columnStr) == 0 {
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if len(statement.GroupByStr) > 0 {
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columnStr = statement.quoteColumnStr(statement.GroupByStr)
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} else {
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columnStr = statement.genColumnStr()
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}
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}
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} else {
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if len(columnStr) == 0 {
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if len(statement.GroupByStr) > 0 {
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columnStr = statement.quoteColumnStr(statement.GroupByStr)
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}
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}
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}
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}
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if len(columnStr) == 0 {
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columnStr = "*"
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}
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if isStruct {
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if err := statement.MergeConds(bean); err != nil {
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return "", nil, err
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}
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} else {
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if err := statement.ProcessIDParam(); err != nil {
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return "", nil, err
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}
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}
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buf := builder.NewWriter()
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if err := statement.writeSelect(buf, columnStr, false); err != nil {
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return "", nil, err
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}
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return buf.String(), buf.Args(), nil
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}
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// GenCountSQL generates the SQL for counting
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func (statement *Statement) GenCountSQL(beans ...interface{}) (string, []interface{}, error) {
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if statement.RawSQL != "" {
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return statement.GenRawSQL(), statement.RawParams, nil
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}
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if len(beans) > 0 {
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if err := statement.SetRefBean(beans[0]); err != nil {
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return "", nil, err
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}
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if err := statement.MergeConds(beans[0]); err != nil {
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return "", nil, err
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}
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}
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selectSQL := statement.SelectStr
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if len(selectSQL) <= 0 {
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if statement.IsDistinct {
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selectSQL = fmt.Sprintf("count(DISTINCT %s)", statement.ColumnStr())
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} else if statement.ColumnStr() != "" {
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selectSQL = fmt.Sprintf("count(%s)", statement.ColumnStr())
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} else {
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selectSQL = "count(*)"
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}
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}
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buf := builder.NewWriter()
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if statement.GroupByStr != "" {
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if _, err := fmt.Fprintf(buf, "SELECT %s FROM (", selectSQL); err != nil {
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return "", nil, err
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}
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}
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var subQuerySelect string
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if statement.GroupByStr != "" {
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subQuerySelect = statement.GroupByStr
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} else {
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subQuerySelect = selectSQL
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}
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if err := statement.writeSelect(buf, subQuerySelect, true); err != nil {
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return "", nil, err
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}
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if statement.GroupByStr != "" {
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if _, err := fmt.Fprintf(buf, ") sub"); err != nil {
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return "", nil, err
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}
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}
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return buf.String(), buf.Args(), nil
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}
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func (statement *Statement) writeFrom(w *builder.BytesWriter) error {
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return statement.writeMultiple(w,
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statement.writeStrings(" FROM "),
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statement.writeTableName,
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statement.writeAlias,
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statement.writeIndexHints,
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statement.writeJoins,
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)
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}
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// write "TOP <n>" (mssql only)
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func (statement *Statement) writeTop(w *builder.BytesWriter) error {
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if statement.LimitN == nil {
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return nil
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}
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_, err := fmt.Fprintf(w, " TOP %d", *statement.LimitN)
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return err
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}
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func (statement *Statement) writeDistinct(w *builder.BytesWriter) error {
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if statement.IsDistinct && !strings.HasPrefix(statement.SelectStr, "count(") {
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_, err := fmt.Fprint(w, " DISTINCT")
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return err
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}
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return nil
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}
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func (statement *Statement) writeSelectColumns(columnStr string) func(w *builder.BytesWriter) error {
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return statement.groupWriteFns(
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statement.writeStrings("SELECT"),
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statement.writeDistinct,
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statement.writeStrings(" ", columnStr),
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)
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}
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func (statement *Statement) writeWhereCond(w *builder.BytesWriter, cond builder.Cond) error {
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if !cond.IsValid() {
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return nil
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}
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if _, err := fmt.Fprint(w, " WHERE "); err != nil {
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return err
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}
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return cond.WriteTo(statement.QuoteReplacer(w))
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}
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func (statement *Statement) writeWhere(w *builder.BytesWriter) error {
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return statement.writeWhereCond(w, statement.cond)
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}
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func (statement *Statement) writeForUpdate(w *builder.BytesWriter) error {
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if !statement.IsForUpdate {
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return nil
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}
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if statement.dialect.URI().DBType != schemas.MYSQL {
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return errors.New("only support mysql for update")
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}
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_, err := fmt.Fprint(w, " FOR UPDATE")
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return err
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}
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func (statement *Statement) writeSelect(buf *builder.BytesWriter, columnStr string, isCounting bool) error {
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dbType := statement.dialect.URI().DBType
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if statement.isUsingLegacyLimitOffset() {
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if dbType == "mssql" {
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return statement.writeMssqlLegacySelect(buf, columnStr)
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}
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if dbType == "oracle" {
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return statement.writeOracleLegacySelect(buf, columnStr)
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}
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}
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return statement.writeMultiple(buf,
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statement.writeSelectColumns(columnStr),
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statement.writeFrom,
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statement.writeWhere,
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statement.writeGroupBy,
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statement.writeHaving,
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func(bw *builder.BytesWriter) (err error) {
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if dbType == "mssql" && len(statement.orderBy) == 0 {
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// ORDER BY is mandatory to use OFFSET and FETCH clause (only in sqlserver)
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if statement.LimitN == nil && statement.Start == 0 {
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// no need to add
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return
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}
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if statement.IsDistinct || len(statement.GroupByStr) > 0 || isCounting {
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// the order-by column should be one of distincts or group-bys
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// order by the first column
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_, err = bw.WriteString(" ORDER BY 1 ASC")
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return
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}
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if statement.RefTable == nil || len(statement.RefTable.PrimaryKeys) != 1 {
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// no primary key, order by the first column
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_, err = bw.WriteString(" ORDER BY 1 ASC")
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return
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}
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// order by primary key
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statement.orderBy = []orderBy{{orderStr: statement.colName(statement.RefTable.GetColumn(statement.RefTable.PrimaryKeys[0]), statement.TableName()), direction: "ASC"}}
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}
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return statement.writeOrderBys(bw)
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},
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statement.writePagination,
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statement.writeForUpdate,
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)
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}
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// GenExistSQL generates Exist SQL
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func (statement *Statement) GenExistSQL(bean ...interface{}) (string, []interface{}, error) {
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if statement.RawSQL != "" {
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return statement.GenRawSQL(), statement.RawParams, nil
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}
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var b interface{}
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if len(bean) > 0 {
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b = bean[0]
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beanValue := reflect.ValueOf(bean[0])
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if beanValue.Kind() != reflect.Ptr {
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return "", nil, errors.New("needs a pointer")
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}
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if beanValue.Elem().Kind() == reflect.Struct {
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if err := statement.SetRefBean(bean[0]); err != nil {
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return "", nil, err
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}
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}
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}
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tableName := statement.TableName()
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if len(tableName) <= 0 {
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return "", nil, ErrTableNotFound
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}
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if statement.RefTable != nil {
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return statement.Limit(1).GenGetSQL(b)
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}
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tableName = statement.quote(tableName)
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buf := builder.NewWriter()
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if statement.dialect.URI().DBType == schemas.MSSQL {
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if _, err := fmt.Fprintf(buf, "SELECT TOP 1 * FROM %s", tableName); err != nil {
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return "", nil, err
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}
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if err := statement.writeJoins(buf); err != nil {
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return "", nil, err
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}
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if err := statement.writeWhere(buf); err != nil {
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return "", nil, err
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}
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} else if statement.dialect.URI().DBType == schemas.ORACLE {
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if _, err := fmt.Fprintf(buf, "SELECT * FROM %s", tableName); err != nil {
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return "", nil, err
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}
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if err := statement.writeJoins(buf); err != nil {
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return "", nil, err
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}
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if _, err := fmt.Fprintf(buf, " WHERE "); err != nil {
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return "", nil, err
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}
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if statement.Conds().IsValid() {
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if err := statement.Conds().WriteTo(statement.QuoteReplacer(buf)); err != nil {
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return "", nil, err
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}
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if _, err := fmt.Fprintf(buf, " AND "); err != nil {
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return "", nil, err
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}
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}
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if _, err := fmt.Fprintf(buf, "ROWNUM=1"); err != nil {
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return "", nil, err
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}
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} else {
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if _, err := fmt.Fprintf(buf, "SELECT 1 FROM %s", tableName); err != nil {
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return "", nil, err
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}
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if err := statement.writeJoins(buf); err != nil {
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return "", nil, err
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}
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if err := statement.writeWhere(buf); err != nil {
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return "", nil, err
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}
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if _, err := fmt.Fprintf(buf, " LIMIT 1"); err != nil {
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return "", nil, err
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}
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}
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return buf.String(), buf.Args(), nil
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}
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func (statement *Statement) genSelectColumnStr() string {
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// manually select columns
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if len(statement.SelectStr) > 0 {
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return statement.SelectStr
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}
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columnStr := statement.ColumnStr()
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if columnStr != "" {
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return columnStr
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}
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// autodetect columns
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if statement.GroupByStr != "" {
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return statement.quoteColumnStr(statement.GroupByStr)
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}
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if len(statement.joins) != 0 {
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return "*"
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}
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columnStr = statement.genColumnStr()
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if columnStr == "" {
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columnStr = "*"
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}
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return columnStr
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}
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// GenFindSQL generates Find SQL
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func (statement *Statement) GenFindSQL(autoCond builder.Cond) (string, []interface{}, error) {
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if statement.RawSQL != "" {
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return statement.GenRawSQL(), statement.RawParams, nil
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}
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if len(statement.TableName()) <= 0 {
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return "", nil, ErrTableNotFound
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}
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statement.cond = statement.cond.And(autoCond)
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buf := builder.NewWriter()
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if err := statement.writeSelect(buf, statement.genSelectColumnStr(), false); err != nil {
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return "", nil, err
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}
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return buf.String(), buf.Args(), nil
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}
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