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row.go
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row.go
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package pgxpoolgo
import (
"fmt"
"github.com/jackc/pgconn"
"github.com/jackc/pgproto3/v2"
"github.com/jackc/pgx/v4"
"reflect"
)
/*
The codes below is based on `pgxmock` from `github.com/pashagolub/pgxmock`
*/
type MockRow struct {
commandTag pgconn.CommandTag
defs []pgproto3.FieldDescription
row []interface{}
scanErr error
}
type row struct {
row *MockRow
}
// NewMockRow mocks pgx.Row.
func NewMockRow(columns []string) *MockRow {
var coldefs []pgproto3.FieldDescription
for _, column := range columns {
coldefs = append(coldefs, pgproto3.FieldDescription{Name: []byte(column)})
}
return &MockRow{
defs: coldefs,
scanErr: nil,
}
}
func (mr *MockRow) ScanError(err error) *MockRow {
mr.scanErr = err
return mr
}
func (mr *MockRow) AddRow(values ...interface{}) *MockRow {
if len(values) != len(mr.defs) {
panic("expected number of values to match number of columns")
}
newRow := make([]interface{}, len(mr.defs))
copy(newRow, values)
mr.row = newRow
return mr
}
func (mr *MockRow) Compose() pgx.Row {
return &row{row: mr}
}
func (r *row) Scan(dest ...interface{}) error {
currentRow := r.row
if currentRow.scanErr != nil {
return currentRow.scanErr
}
if len(dest) != len(currentRow.defs) {
return fmt.Errorf("incorrect argument number %d for columns %d", len(dest), len(currentRow.defs))
}
for i, col := range currentRow.row {
if dest[i] == nil {
continue
}
destVal := reflect.ValueOf(dest[i])
if destVal.Kind() != reflect.Ptr {
return fmt.Errorf("destination argument must be a pointer for column %s", currentRow.defs[i].Name)
}
if col == nil {
dest[i] = nil
continue
}
val := reflect.ValueOf(col)
if _, ok := dest[i].(*interface{}); ok || destVal.Elem().Kind() == val.Kind() {
if destElem := destVal.Elem(); destElem.CanSet() {
destElem.Set(val)
} else {
return fmt.Errorf("cannot set destination value for column %s", string(currentRow.defs[i].Name))
}
} else {
scanner, ok := destVal.Interface().(interface{ Scan(interface{}) error })
if !ok {
return fmt.Errorf("destination kind '%v' not supported for value kind '%v' of column '%s'",
destVal.Elem().Kind(), val.Kind(), string(currentRow.defs[i].Name))
}
if err := scanner.Scan(val.Interface()); err != nil {
return fmt.Errorf("scanning value error for column '%s': %w", string(currentRow.defs[i].Name), err)
}
}
}
return nil
}