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dml_select_bind_rows.go
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dml_select_bind_rows.go
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// Copyright 2020~2023 xgfone
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sqlx
import (
"context"
"database/sql"
"reflect"
"time"
)
var DefaultSliceCap = 16
// QueryRows executes the query sql statement and returns Rows instead of *sql.Rows.
func (db *DB) QueryRows(query string, args ...any) (Rows, error) {
return db.QueryRowsContext(context.Background(), query, args...)
}
// QueryRowsContext executes the query sql statement and returns Rows instead of *sql.Rows.
func (db *DB) QueryRowsContext(ctx context.Context, query string, args ...any) (rows Rows, err error) {
if query, args, err = db.Intercept(query, args); err == nil {
var _rows *sql.Rows
_rows, err = getDB(db).QueryContext(ctx, query, args...)
rows.Rows = _rows
}
return
}
// Query builds the sql and executes it.
func (b *SelectBuilder) Query() (Rows, error) {
return b.QueryContext(context.Background())
}
// QueryContext builds the sql and executes it.
func (b *SelectBuilder) QueryContext(ctx context.Context) (Rows, error) {
query, args := b.Build()
defer args.Release()
return b.queryContext(ctx, query, args.Args()...)
}
func (b *SelectBuilder) queryContext(ctx context.Context, rawsql string, args ...any) (Rows, error) {
rows, err := getDB(b.db).QueryContext(ctx, rawsql, args...)
return Rows{b.SelectedColumns(), rows}, err
}
// BindRows is equal to b.BindRowsContext(context.Background(), slice).
func (b *SelectBuilder) BindRows(slice any) error {
return b.BindRowsContext(context.Background(), slice)
}
// BindRowsContext is the same QueryContext, but scans the result set
// into the slice.
//
// Notice: slice must be a pointer to a slice. And the element of the slice
// may be a struct or type implemented the interface sql.Scanner.
func (b *SelectBuilder) BindRowsContext(ctx context.Context, slice any) error {
rows, err := b.QueryContext(ctx)
return rows.TryBindSlice(slice, err)
}
// Rows is used to wrap sql.Rows.
type Rows struct {
Columns []string // Only used by ScanStruct
*sql.Rows
}
// NewRows returns a new Rows.
func NewRows(rows *sql.Rows, columns ...string) Rows {
return Rows{Rows: rows, Columns: columns}
}
// TryBindSlice is the same as BindSlice, which binds rows to slice
// only if err is equal to nil.
func (r Rows) TryBindSlice(slice any, err error) error {
if err != nil {
return err
}
return r.BindSlice(slice)
}
// BindSlice is the same as ScanSlice, but closes sql.Rows.
func (r Rows) BindSlice(slice any) (err error) {
defer r.Rows.Close()
return r.ScanSlice(slice)
}
func (r Rows) scan(dests ...any) error {
return ScanRow(r.Rows.Scan, dests...)
}
func (r Rows) scanStruct(s any) (err error) {
columns := r.Columns
if len(columns) == 0 {
if columns, err = r.Rows.Columns(); err != nil {
return
}
}
return ScanColumnsToStruct(r.scan, columns, s)
}
// Scan implements the interface sql.Scanner, which is the proxy of sql.Rows
// and supports that the sql value is NULL.
func (r Rows) Scan(dests ...any) (err error) {
if r.Rows == nil {
return
}
return r.scan(dests...)
}
// ScanStruct is the same as Scan, but the columns are scanned into the struct
// s, which uses ScanColumnsToStruct.
func (r Rows) ScanStruct(s any) (err error) {
if r.Rows == nil {
return
}
return r.scanStruct(s)
}
// ScanStructWithColumns is the same as Scan, but the columns are scanned
// into the struct s by using ScanColumnsToStruct.
func (r Rows) ScanStructWithColumns(s any, columns ...string) (err error) {
if r.Rows == nil {
return
}
return ScanColumnsToStruct(r.scan, columns, s)
}
var scannerType = reflect.TypeOf((*sql.Scanner)(nil)).Elem()
// ScanSlice is used to scan the row set into the slice.
func (r Rows) ScanSlice(slice any) (err error) {
if r.Rows == nil {
return
}
oldvf := reflect.ValueOf(slice)
if oldvf.Kind() != reflect.Ptr {
panic("Rows.ScanSlice: the value must be a pointer to a slice")
}
vf := oldvf.Elem()
if vf.Kind() != reflect.Slice {
panic("Rows.ScanSlice: the value must be a pointer to a slice")
}
vt := vf.Type()
et := vt.Elem()
if vf.Cap() == 0 {
vf.Set(reflect.MakeSlice(vt, 0, DefaultSliceCap))
}
scan := r.scansingle
if et.Kind() == reflect.Struct {
e := reflect.New(et)
_, ok := e.Interface().(*time.Time)
if !ok && !e.Type().Implements(scannerType) {
scan = r.ScanStruct
}
}
for r.Next() {
e := reflect.New(et)
if err := scan(e.Interface()); err != nil {
return err
}
vf = reflect.Append(vf, e.Elem())
}
oldvf.Elem().Set(vf)
return nil
}
func (r Rows) scansingle(v any) error { return r.scan(v) }