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sqladapter.go
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sqladapter.go
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package minisql
import "database/sql"
type DBAdapter struct {
*sql.DB
}
func (db *DBAdapter) Begin() (Tx, error) {
tx, err := db.DB.Begin()
if err != nil {
return nil, err
}
return &TxAdapter{tx}, nil
}
func (db *DBAdapter) Exec(query string, args Values) error {
_, err := db.DB.Exec(query, argsToParams(args)...)
return err
}
func (db *DBAdapter) Query(query string, args Values) (Rows, error) {
result, err := db.DB.Query(query, argsToParams(args)...)
return &rowsAdapter{Rows: result}, err
}
type TxAdapter struct {
*sql.Tx
}
func (tx *TxAdapter) Exec(query string, args Values) error {
_, err := tx.Tx.Exec(query, argsToParams(args)...)
return err
}
func (tx *TxAdapter) Query(query string, args Values) (Rows, error) {
result, err := tx.Tx.Query(query, argsToParams(args)...)
return &rowsAdapter{Rows: result}, err
}
func argsToParams(args Values) []interface{} {
params := make([]interface{}, 0, args.Len())
for i := 0; i < args.Len(); i++ {
params = append(params, args.Get(i).value())
}
return params
}
type rowsAdapter struct {
*sql.Rows
}
func (ra *rowsAdapter) Scan(values Values) error {
row := make([]interface{}, 0, values.Len())
for i := 0; i < values.Len(); i++ {
row = append(row, values.Get(i).pointerToEmptyValue())
}
err := ra.Rows.Scan(row...)
if err == nil {
for i, ptv := range row {
values.Get(i).set(ptv)
}
}
return err
}