Lunny Xiao
f9a6990ecb
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continuous-integration/drone/push Build is passing
Reviewed-on: #2150
500 lines
12 KiB
Go
500 lines
12 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/internal/utils"
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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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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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if statement.JoinStr == "" {
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if columnStr == "" {
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if statement.GroupByStr != "" {
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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 columnStr == "" {
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if statement.GroupByStr != "" {
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columnStr = statement.quoteColumnStr(statement.GroupByStr)
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} else {
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columnStr = "*"
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}
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}
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}
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if columnStr == "" {
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columnStr = "*"
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}
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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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return statement.genSelectSQL(columnStr, true, true)
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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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sumSelect := strings.Join(sumStrs, ", ")
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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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return statement.genSelectSQL(sumSelect, true, true)
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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.JoinStr) == 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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return statement.genSelectSQL(columnStr, true, true)
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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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var condArgs []interface{}
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var err error
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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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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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sqlStr, condArgs, err := statement.genSelectSQL(subQuerySelect, false, false)
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if err != nil {
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return "", nil, err
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}
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if statement.GroupByStr != "" {
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sqlStr = fmt.Sprintf("SELECT %s FROM (%s) sub", selectSQL, sqlStr)
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}
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return sqlStr, condArgs, nil
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}
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func (statement *Statement) writeFrom(w builder.Writer) error {
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if _, err := fmt.Fprint(w, " FROM "); err != nil {
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return err
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}
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if err := statement.writeTableName(w); err != nil {
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return err
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}
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if err := statement.writeAlias(w); err != nil {
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return err
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}
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return statement.writeJoin(w)
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}
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func (statement *Statement) writeLimitOffset(w builder.Writer) error {
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if statement.Start > 0 {
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if statement.LimitN != nil {
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_, err := fmt.Fprintf(w, " LIMIT %v OFFSET %v", *statement.LimitN, statement.Start)
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return err
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}
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_, err := fmt.Fprintf(w, " LIMIT 0 OFFSET %v", statement.Start)
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return err
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}
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if statement.LimitN != nil {
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_, err := fmt.Fprint(w, " LIMIT ", *statement.LimitN)
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return err
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}
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// no limit statement
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return nil
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}
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func (statement *Statement) genSelectSQL(columnStr string, needLimit, needOrderBy bool) (string, []interface{}, error) {
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var (
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distinct string
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dialect = statement.dialect
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top, whereStr string
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mssqlCondi = builder.NewWriter()
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)
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if statement.IsDistinct && !strings.HasPrefix(columnStr, "count") {
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distinct = "DISTINCT "
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}
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condWriter := builder.NewWriter()
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if err := statement.cond.WriteTo(statement.QuoteReplacer(condWriter)); err != nil {
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return "", nil, err
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}
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if condWriter.Len() > 0 {
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whereStr = " WHERE "
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}
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pLimitN := statement.LimitN
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if dialect.URI().DBType == schemas.MSSQL {
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if pLimitN != nil {
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LimitNValue := *pLimitN
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top = fmt.Sprintf("TOP %d ", LimitNValue)
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}
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if statement.Start > 0 {
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if statement.RefTable == nil {
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return "", nil, errors.New("Unsupported query limit without reference table")
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}
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var column string
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if len(statement.RefTable.PKColumns()) == 0 {
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for _, index := range statement.RefTable.Indexes {
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if len(index.Cols) == 1 {
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column = index.Cols[0]
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break
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}
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}
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if len(column) == 0 {
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column = statement.RefTable.ColumnsSeq()[0]
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}
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} else {
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column = statement.RefTable.PKColumns()[0].Name
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}
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if statement.needTableName() {
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if len(statement.TableAlias) > 0 {
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column = fmt.Sprintf("%s.%s", statement.TableAlias, column)
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} else {
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column = fmt.Sprintf("%s.%s", statement.TableName(), column)
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}
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}
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if _, err := fmt.Fprintf(mssqlCondi, "(%s NOT IN (SELECT TOP %d %s",
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column, statement.Start, column); err != nil {
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return "", nil, err
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}
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if err := statement.writeFrom(mssqlCondi); err != nil {
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return "", nil, err
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}
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if whereStr != "" {
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if _, err := fmt.Fprint(mssqlCondi, whereStr); err != nil {
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return "", nil, err
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}
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if err := utils.WriteBuilder(mssqlCondi, statement.QuoteReplacer(condWriter)); err != nil {
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return "", nil, err
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}
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}
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if needOrderBy {
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if err := statement.WriteOrderBy(mssqlCondi); err != nil {
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return "", nil, err
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}
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}
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if err := statement.WriteGroupBy(mssqlCondi); err != nil {
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return "", nil, err
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}
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if _, err := fmt.Fprint(mssqlCondi, "))"); 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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buf := builder.NewWriter()
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if _, err := fmt.Fprintf(buf, "SELECT %v%v%v", distinct, top, columnStr); err != nil {
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return "", nil, err
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}
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if err := statement.writeFrom(buf); err != nil {
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return "", nil, err
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}
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if whereStr != "" {
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if _, err := fmt.Fprint(buf, whereStr); err != nil {
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return "", nil, err
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}
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if err := utils.WriteBuilder(buf, statement.QuoteReplacer(condWriter)); err != nil {
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return "", nil, err
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}
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}
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if mssqlCondi.Len() > 0 {
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if len(whereStr) > 0 {
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if _, err := fmt.Fprint(buf, " AND "); 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.Fprint(buf, " WHERE "); err != nil {
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return "", nil, err
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}
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}
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if err := utils.WriteBuilder(buf, mssqlCondi); err != nil {
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return "", nil, err
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}
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}
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if err := statement.WriteGroupBy(buf); err != nil {
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return "", nil, err
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}
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if err := statement.writeHaving(buf); err != nil {
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return "", nil, err
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}
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if needOrderBy {
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if err := statement.WriteOrderBy(buf); err != nil {
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return "", nil, err
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}
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}
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if needLimit {
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if dialect.URI().DBType != schemas.MSSQL && dialect.URI().DBType != schemas.ORACLE {
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if err := statement.writeLimitOffset(buf); err != nil {
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return "", nil, err
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}
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} else if dialect.URI().DBType == schemas.ORACLE {
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if pLimitN != nil {
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oldString := buf.String()
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buf.Reset()
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rawColStr := columnStr
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if rawColStr == "*" {
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rawColStr = "at.*"
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}
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fmt.Fprintf(buf, "SELECT %v FROM (SELECT %v,ROWNUM RN FROM (%v) at WHERE ROWNUM <= %d) aat WHERE RN > %d",
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columnStr, rawColStr, oldString, statement.Start+*pLimitN, statement.Start)
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}
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}
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}
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if statement.IsForUpdate {
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return dialect.ForUpdateSQL(buf.String()), buf.Args(), nil
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}
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return buf.String(), buf.Args(), nil
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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.writeJoin(buf); 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 := fmt.Fprintf(buf, " WHERE "); err != nil {
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return "", nil, err
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}
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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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}
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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.writeJoin(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.writeJoin(buf); 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 := fmt.Fprintf(buf, " WHERE "); err != nil {
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return "", nil, err
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}
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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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}
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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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// 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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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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if statement.JoinStr == "" {
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if columnStr == "" {
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if statement.GroupByStr != "" {
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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 columnStr == "" {
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if statement.GroupByStr != "" {
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columnStr = statement.quoteColumnStr(statement.GroupByStr)
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} else {
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columnStr = "*"
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}
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}
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}
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if columnStr == "" {
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columnStr = "*"
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}
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}
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statement.cond = statement.cond.And(autoCond)
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return statement.genSelectSQL(columnStr, true, true)
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}
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