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// Copyright 2019 The Xorm Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package statements
import (
"errors"
"fmt"
"reflect"
"strings"
"xorm.io/builder"
"xorm.io/xorm/schemas"
)
// GenQuerySQL generate query SQL
func (statement *Statement) GenQuerySQL(sqlOrArgs ...interface{}) (string, []interface{}, error) {
if len(sqlOrArgs) > 0 {
return statement.ConvertSQLOrArgs(sqlOrArgs...)
}
if statement.RawSQL != "" {
return statement.GenRawSQL(), statement.RawParams, nil
}
if len(statement.TableName()) <= 0 {
return "", nil, ErrTableNotFound
}
var columnStr = statement.ColumnStr()
if len(statement.SelectStr) > 0 {
columnStr = statement.SelectStr
} else {
if statement.JoinStr == "" {
if columnStr == "" {
if statement.GroupByStr != "" {
columnStr = statement.quoteColumnStr(statement.GroupByStr)
} else {
columnStr = statement.genColumnStr()
}
}
} else {
if columnStr == "" {
if statement.GroupByStr != "" {
columnStr = statement.quoteColumnStr(statement.GroupByStr)
} else {
columnStr = "*"
}
}
}
if columnStr == "" {
columnStr = "*"
}
}
if err := statement.ProcessIDParam(); err != nil {
return "", nil, err
}
sqlStr, condArgs, err := statement.genSelectSQL(columnStr, true, true)
if err != nil {
return "", nil, err
}
args := append(statement.joinArgs, condArgs...)
// for mssql and use limit
qs := strings.Count(sqlStr, "?")
if len(args)*2 == qs {
args = append(args, args...)
}
return sqlStr, args, nil
}
// GenSumSQL generates sum SQL
func (statement *Statement) GenSumSQL(bean interface{}, columns ...string) (string, []interface{}, error) {
if statement.RawSQL != "" {
return statement.GenRawSQL(), statement.RawParams, nil
}
statement.SetRefBean(bean)
var sumStrs = make([]string, 0, len(columns))
for _, colName := range columns {
if !strings.Contains(colName, " ") && !strings.Contains(colName, "(") {
colName = statement.quote(colName)
} else {
colName = statement.ReplaceQuote(colName)
}
sumStrs = append(sumStrs, fmt.Sprintf("COALESCE(sum(%s),0)", colName))
}
sumSelect := strings.Join(sumStrs, ", ")
if err := statement.mergeConds(bean); err != nil {
return "", nil, err
}
sqlStr, condArgs, err := statement.genSelectSQL(sumSelect, true, true)
if err != nil {
return "", nil, err
}
return sqlStr, append(statement.joinArgs, condArgs...), nil
}
// GenGetSQL generates Get SQL
func (statement *Statement) GenGetSQL(bean interface{}) (string, []interface{}, error) {
v := rValue(bean)
isStruct := v.Kind() == reflect.Struct
if isStruct {
statement.SetRefBean(bean)
}
var columnStr = statement.ColumnStr()
if len(statement.SelectStr) > 0 {
columnStr = statement.SelectStr
} else {
// TODO: always generate column names, not use * even if join
if len(statement.JoinStr) == 0 {
if len(columnStr) == 0 {
if len(statement.GroupByStr) > 0 {
columnStr = statement.quoteColumnStr(statement.GroupByStr)
} else {
columnStr = statement.genColumnStr()
}
}
} else {
if len(columnStr) == 0 {
if len(statement.GroupByStr) > 0 {
columnStr = statement.quoteColumnStr(statement.GroupByStr)
}
}
}
}
if len(columnStr) == 0 {
columnStr = "*"
}
if isStruct {
if err := statement.mergeConds(bean); err != nil {
return "", nil, err
}
} else {
if err := statement.ProcessIDParam(); err != nil {
return "", nil, err
}
}
sqlStr, condArgs, err := statement.genSelectSQL(columnStr, true, true)
if err != nil {
return "", nil, err
}
return sqlStr, append(statement.joinArgs, condArgs...), nil
}
// GenCountSQL generates the SQL for counting
func (statement *Statement) GenCountSQL(beans ...interface{}) (string, []interface{}, error) {
if statement.RawSQL != "" {
return statement.GenRawSQL(), statement.RawParams, nil
}
var condArgs []interface{}
var err error
if len(beans) > 0 {
statement.SetRefBean(beans[0])
if err := statement.mergeConds(beans[0]); err != nil {
return "", nil, err
}
}
var selectSQL = statement.SelectStr
if len(selectSQL) <= 0 {
if statement.IsDistinct {
selectSQL = fmt.Sprintf("count(DISTINCT %s)", statement.ColumnStr())
} else if statement.ColumnStr() != "" {
selectSQL = fmt.Sprintf("count(%s)", statement.ColumnStr())
} else {
selectSQL = "count(*)"
}
}
sqlStr, condArgs, err := statement.genSelectSQL(selectSQL, false, false)
if err != nil {
return "", nil, err
}
return sqlStr, append(statement.joinArgs, condArgs...), nil
}
func (statement *Statement) genSelectSQL(columnStr string, needLimit, needOrderBy bool) (string, []interface{}, error) {
var (
distinct string
dialect = statement.dialect
quote = statement.quote
fromStr = " FROM "
top, mssqlCondi, whereStr string
)
if statement.IsDistinct && !strings.HasPrefix(columnStr, "count") {
distinct = "DISTINCT "
}
condSQL, condArgs, err := statement.GenCondSQL(statement.cond)
if err != nil {
return "", nil, err
}
if len(condSQL) > 0 {
whereStr = " WHERE " + condSQL
}
if dialect.URI().DBType == schemas.MSSQL && strings.Contains(statement.TableName(), "..") {
fromStr += statement.TableName()
} else {
fromStr += quote(statement.TableName())
}
if statement.TableAlias != "" {
if dialect.URI().DBType == schemas.ORACLE {
fromStr += " " + quote(statement.TableAlias)
} else {
fromStr += " AS " + quote(statement.TableAlias)
}
}
if statement.JoinStr != "" {
fromStr = fmt.Sprintf("%v %v", fromStr, statement.JoinStr)
}
pLimitN := statement.LimitN
if dialect.URI().DBType == schemas.MSSQL {
if pLimitN != nil {
LimitNValue := *pLimitN
top = fmt.Sprintf("TOP %d ", LimitNValue)
}
if statement.Start > 0 {
var column string
if len(statement.RefTable.PKColumns()) == 0 {
for _, index := range statement.RefTable.Indexes {
if len(index.Cols) == 1 {
column = index.Cols[0]
break
}
}
if len(column) == 0 {
column = statement.RefTable.ColumnsSeq()[0]
}
} else {
column = statement.RefTable.PKColumns()[0].Name
}
if statement.needTableName() {
if len(statement.TableAlias) > 0 {
column = statement.TableAlias + "." + column
} else {
column = statement.TableName() + "." + column
}
}
var orderStr string
if needOrderBy && len(statement.OrderStr) > 0 {
orderStr = " ORDER BY " + statement.OrderStr
}
var groupStr string
if len(statement.GroupByStr) > 0 {
groupStr = " GROUP BY " + statement.GroupByStr
}
mssqlCondi = fmt.Sprintf("(%s NOT IN (SELECT TOP %d %s%s%s%s%s))",
column, statement.Start, column, fromStr, whereStr, orderStr, groupStr)
}
}
var buf strings.Builder
fmt.Fprintf(&buf, "SELECT %v%v%v%v%v", distinct, top, columnStr, fromStr, whereStr)
if len(mssqlCondi) > 0 {
if len(whereStr) > 0 {
fmt.Fprint(&buf, " AND ", mssqlCondi)
} else {
fmt.Fprint(&buf, " WHERE ", mssqlCondi)
}
}
if statement.GroupByStr != "" {
fmt.Fprint(&buf, " GROUP BY ", statement.GroupByStr)
}
if statement.HavingStr != "" {
fmt.Fprint(&buf, " ", statement.HavingStr)
}
if needOrderBy && statement.OrderStr != "" {
fmt.Fprint(&buf, " ORDER BY ", statement.OrderStr)
}
if needLimit {
if dialect.URI().DBType != schemas.MSSQL && dialect.URI().DBType != schemas.ORACLE {
if statement.Start > 0 {
if pLimitN != nil {
fmt.Fprintf(&buf, " LIMIT %v OFFSET %v", *pLimitN, statement.Start)
} else {
fmt.Fprintf(&buf, "LIMIT 0 OFFSET %v", statement.Start)
}
} else if pLimitN != nil {
fmt.Fprint(&buf, " LIMIT ", *pLimitN)
}
} else if dialect.URI().DBType == schemas.ORACLE {
if statement.Start != 0 || pLimitN != nil {
oldString := buf.String()
buf.Reset()
rawColStr := columnStr
if rawColStr == "*" {
rawColStr = "at.*"
}
fmt.Fprintf(&buf, "SELECT %v FROM (SELECT %v,ROWNUM RN FROM (%v) at WHERE ROWNUM <= %d) aat WHERE RN > %d",
columnStr, rawColStr, oldString, statement.Start+*pLimitN, statement.Start)
}
}
}
if statement.IsForUpdate {
return dialect.ForUpdateSQL(buf.String()), condArgs, nil
}
return buf.String(), condArgs, nil
}
// GenExistSQL generates Exist SQL
func (statement *Statement) GenExistSQL(bean ...interface{}) (string, []interface{}, error) {
if statement.RawSQL != "" {
return statement.GenRawSQL(), statement.RawParams, nil
}
var sqlStr string
var args []interface{}
var joinStr string
var err error
if len(bean) == 0 {
tableName := statement.TableName()
if len(tableName) <= 0 {
return "", nil, ErrTableNotFound
}
tableName = statement.quote(tableName)
if len(statement.JoinStr) > 0 {
joinStr = statement.JoinStr
}
if statement.Conds().IsValid() {
condSQL, condArgs, err := statement.GenCondSQL(statement.Conds())
if err != nil {
return "", nil, err
}
if statement.dialect.URI().DBType == schemas.MSSQL {
sqlStr = fmt.Sprintf("SELECT TOP 1 * FROM %s %s WHERE %s", tableName, joinStr, condSQL)
} else if statement.dialect.URI().DBType == schemas.ORACLE {
sqlStr = fmt.Sprintf("SELECT * FROM %s WHERE (%s) %s AND ROWNUM=1", tableName, joinStr, condSQL)
} else {
sqlStr = fmt.Sprintf("SELECT * FROM %s %s WHERE %s LIMIT 1", tableName, joinStr, condSQL)
}
args = condArgs
} else {
if statement.dialect.URI().DBType == schemas.MSSQL {
sqlStr = fmt.Sprintf("SELECT TOP 1 * FROM %s %s", tableName, joinStr)
} else if statement.dialect.URI().DBType == schemas.ORACLE {
sqlStr = fmt.Sprintf("SELECT * FROM %s %s WHERE ROWNUM=1", tableName, joinStr)
} else {
sqlStr = fmt.Sprintf("SELECT * FROM %s %s LIMIT 1", tableName, joinStr)
}
args = []interface{}{}
}
} else {
beanValue := reflect.ValueOf(bean[0])
if beanValue.Kind() != reflect.Ptr {
return "", nil, errors.New("needs a pointer")
}
if beanValue.Elem().Kind() == reflect.Struct {
if err := statement.SetRefBean(bean[0]); err != nil {
return "", nil, err
}
}
if len(statement.TableName()) <= 0 {
return "", nil, ErrTableNotFound
}
statement.Limit(1)
sqlStr, args, err = statement.GenGetSQL(bean[0])
if err != nil {
return "", nil, err
}
}
return sqlStr, args, nil
}
// GenFindSQL generates Find SQL
func (statement *Statement) GenFindSQL(autoCond builder.Cond) (string, []interface{}, error) {
if statement.RawSQL != "" {
return statement.GenRawSQL(), statement.RawParams, nil
}
var sqlStr string
var args []interface{}
var err error
if len(statement.TableName()) <= 0 {
return "", nil, ErrTableNotFound
}
var columnStr = statement.ColumnStr()
if len(statement.SelectStr) > 0 {
columnStr = statement.SelectStr
} else {
if statement.JoinStr == "" {
if columnStr == "" {
if statement.GroupByStr != "" {
columnStr = statement.quoteColumnStr(statement.GroupByStr)
} else {
columnStr = statement.genColumnStr()
}
}
} else {
if columnStr == "" {
if statement.GroupByStr != "" {
columnStr = statement.quoteColumnStr(statement.GroupByStr)
} else {
columnStr = "*"
}
}
}
if columnStr == "" {
columnStr = "*"
}
}
statement.cond = statement.cond.And(autoCond)
sqlStr, condArgs, err := statement.genSelectSQL(columnStr, true, true)
if err != nil {
return "", nil, err
}
args = append(statement.joinArgs, condArgs...)
// for mssql and use limit
qs := strings.Count(sqlStr, "?")
if len(args)*2 == qs {
args = append(args, args...)
}
return sqlStr, args, nil
}