83 lines
1.4 KiB
Go
83 lines
1.4 KiB
Go
package bun
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import (
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"context"
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"database/sql"
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"reflect"
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"github.com/uptrace/bun/internal"
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"github.com/uptrace/bun/schema"
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)
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type sliceInfo struct {
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nextElem func() reflect.Value
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scan schema.ScannerFunc
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}
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type sliceModel struct {
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dest []interface{}
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values []reflect.Value
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scanIndex int
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info []sliceInfo
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}
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var _ Model = (*sliceModel)(nil)
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func newSliceModel(db *DB, dest []interface{}, values []reflect.Value) *sliceModel {
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return &sliceModel{
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dest: dest,
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values: values,
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}
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}
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func (m *sliceModel) Value() interface{} {
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return m.dest
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}
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func (m *sliceModel) ScanRows(ctx context.Context, rows *sql.Rows) (int, error) {
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columns, err := rows.Columns()
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if err != nil {
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return 0, err
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}
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m.info = make([]sliceInfo, len(m.values))
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for i, v := range m.values {
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if v.IsValid() && v.Len() > 0 {
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v.Set(v.Slice(0, 0))
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}
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m.info[i] = sliceInfo{
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nextElem: internal.MakeSliceNextElemFunc(v),
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scan: schema.Scanner(v.Type().Elem()),
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}
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}
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if len(columns) == 0 {
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return 0, nil
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}
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dest := makeDest(m, len(columns))
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var n int
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for rows.Next() {
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m.scanIndex = 0
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if err := rows.Scan(dest...); err != nil {
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return 0, err
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}
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n++
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}
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if err := rows.Err(); err != nil {
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return 0, err
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}
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return n, nil
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}
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func (m *sliceModel) Scan(src interface{}) error {
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info := m.info[m.scanIndex]
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m.scanIndex++
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dest := info.nextElem()
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return info.scan(dest, src)
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}
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