96 lines
2.5 KiB
Go
96 lines
2.5 KiB
Go
// Copyright 2017 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 xorm
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import (
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"errors"
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"fmt"
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"reflect"
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"xorm.io/builder"
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"xorm.io/core"
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)
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// Exist returns true if the record exist otherwise return false
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func (session *Session) Exist(bean ...interface{}) (bool, error) {
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if session.isAutoClose {
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defer session.Close()
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}
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if session.statement.lastError != nil {
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return false, session.statement.lastError
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}
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var sqlStr string
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var args []interface{}
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var err error
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if session.statement.RawSQL == "" {
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if len(bean) == 0 {
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tableName := session.statement.TableName()
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if len(tableName) <= 0 {
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return false, ErrTableNotFound
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}
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tableName = session.statement.Engine.Quote(tableName)
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if session.statement.cond.IsValid() {
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condSQL, condArgs, err := builder.ToSQL(session.statement.cond)
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if err != nil {
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return false, err
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}
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if session.engine.dialect.DBType() == core.MSSQL {
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sqlStr = fmt.Sprintf("SELECT TOP 1 * FROM %s WHERE %s", tableName, condSQL)
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} else if session.engine.dialect.DBType() == core.ORACLE {
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sqlStr = fmt.Sprintf("SELECT * FROM %s WHERE (%s) AND ROWNUM=1", tableName, condSQL)
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} else {
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sqlStr = fmt.Sprintf("SELECT * FROM %s WHERE %s LIMIT 1", tableName, condSQL)
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}
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args = condArgs
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} else {
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if session.engine.dialect.DBType() == core.MSSQL {
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sqlStr = fmt.Sprintf("SELECT TOP 1 * FROM %s", tableName)
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} else if session.engine.dialect.DBType() == core.ORACLE {
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sqlStr = fmt.Sprintf("SELECT * FROM %s WHERE ROWNUM=1", tableName)
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} else {
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sqlStr = fmt.Sprintf("SELECT * FROM %s LIMIT 1", tableName)
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}
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args = []interface{}{}
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}
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} else {
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beanValue := reflect.ValueOf(bean[0])
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if beanValue.Kind() != reflect.Ptr {
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return false, 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 := session.statement.setRefBean(bean[0]); err != nil {
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return false, err
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}
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}
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if len(session.statement.TableName()) <= 0 {
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return false, ErrTableNotFound
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}
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session.statement.Limit(1)
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sqlStr, args, err = session.statement.genGetSQL(bean[0])
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if err != nil {
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return false, err
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}
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}
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} else {
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sqlStr = session.statement.RawSQL
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args = session.statement.RawParams
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}
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rows, err := session.queryRows(sqlStr, args...)
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if err != nil {
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return false, err
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}
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defer rows.Close()
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return rows.Next(), nil
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}
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