146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
// Copyright 2015 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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"database/sql"
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"fmt"
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"reflect"
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"github.com/go-xorm/core"
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)
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type Rows struct {
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NoTypeCheck bool
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session *Session
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stmt *core.Stmt
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rows *core.Rows
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fields []string
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fieldsCount int
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beanType reflect.Type
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lastError error
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}
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func newRows(session *Session, bean interface{}) (*Rows, error) {
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rows := new(Rows)
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rows.session = session
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rows.beanType = reflect.Indirect(reflect.ValueOf(bean)).Type()
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defer rows.session.Statement.Init()
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var sqlStr string
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var args []interface{}
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rows.session.Statement.RefTable = rows.session.Engine.TableInfo(bean)
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if rows.session.Statement.RawSQL == "" {
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sqlStr, args = rows.session.Statement.genGetSql(bean)
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} else {
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sqlStr = rows.session.Statement.RawSQL
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args = rows.session.Statement.RawParams
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}
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for _, filter := range rows.session.Engine.dialect.Filters() {
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sqlStr = filter.Do(sqlStr, session.Engine.dialect, rows.session.Statement.RefTable)
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}
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rows.session.saveLastSQL(sqlStr, args)
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var err error
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rows.stmt, err = rows.session.DB().Prepare(sqlStr)
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if err != nil {
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rows.lastError = err
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defer rows.Close()
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return nil, err
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}
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rows.rows, err = rows.stmt.Query(args...)
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if err != nil {
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rows.lastError = err
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defer rows.Close()
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return nil, err
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}
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rows.fields, err = rows.rows.Columns()
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if err != nil {
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rows.lastError = err
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defer rows.Close()
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return nil, err
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}
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rows.fieldsCount = len(rows.fields)
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return rows, nil
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}
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// move cursor to next record, return false if end has reached
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func (rows *Rows) Next() bool {
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if rows.lastError == nil && rows.rows != nil {
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hasNext := rows.rows.Next()
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if !hasNext {
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rows.lastError = sql.ErrNoRows
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}
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return hasNext
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}
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return false
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}
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// Err returns the error, if any, that was encountered during iteration. Err may be called after an explicit or implicit Close.
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func (rows *Rows) Err() error {
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return rows.lastError
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}
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// scan row record to bean properties
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func (rows *Rows) Scan(bean interface{}) error {
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if rows.lastError != nil {
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return rows.lastError
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}
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if !rows.NoTypeCheck && reflect.Indirect(reflect.ValueOf(bean)).Type() != rows.beanType {
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return fmt.Errorf("scan arg is incompatible type to [%v]", rows.beanType)
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}
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return rows.session.row2Bean(rows.rows, rows.fields, rows.fieldsCount, bean)
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// result, err := row2map(rows.rows, rows.fields) // !nashtsai! TODO remove row2map then scanMapIntoStruct conversation for better performance
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// if err == nil {
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// err = rows.session.scanMapIntoStruct(bean, result)
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// }
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// return err
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}
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// // Columns returns the column names. Columns returns an error if the rows are closed, or if the rows are from QueryRow and there was a deferred error.
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// func (rows *Rows) Columns() ([]string, error) {
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// if rows.lastError == nil && rows.rows != nil {
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// return rows.rows.Columns()
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// }
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// return nil, rows.lastError
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// }
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// close session if session.IsAutoClose is true, and claimed any opened resources
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func (rows *Rows) Close() error {
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if rows.session.IsAutoClose {
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defer rows.session.Close()
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}
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if rows.lastError == nil {
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if rows.rows != nil {
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rows.lastError = rows.rows.Close()
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if rows.lastError != nil {
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defer rows.stmt.Close()
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return rows.lastError
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}
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}
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if rows.stmt != nil {
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rows.lastError = rows.stmt.Close()
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}
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} else {
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if rows.stmt != nil {
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defer rows.stmt.Close()
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}
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if rows.rows != nil {
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defer rows.rows.Close()
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}
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}
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return rows.lastError
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}
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