mirror of
https://github.com/autc04/Retro68.git
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149 lines
3.6 KiB
Go
149 lines
3.6 KiB
Go
// Copyright 2016 The Go 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 sql
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import (
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"context"
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"database/sql/driver"
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"errors"
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)
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func ctxDriverPrepare(ctx context.Context, ci driver.Conn, query string) (driver.Stmt, error) {
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if ciCtx, is := ci.(driver.ConnPrepareContext); is {
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return ciCtx.PrepareContext(ctx, query)
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}
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si, err := ci.Prepare(query)
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if err == nil {
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select {
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default:
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case <-ctx.Done():
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si.Close()
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return nil, ctx.Err()
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}
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}
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return si, err
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}
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func ctxDriverExec(ctx context.Context, execerCtx driver.ExecerContext, execer driver.Execer, query string, nvdargs []driver.NamedValue) (driver.Result, error) {
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if execerCtx != nil {
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return execerCtx.ExecContext(ctx, query, nvdargs)
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}
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dargs, err := namedValueToValue(nvdargs)
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if err != nil {
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return nil, err
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}
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select {
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default:
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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return execer.Exec(query, dargs)
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}
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func ctxDriverQuery(ctx context.Context, queryerCtx driver.QueryerContext, queryer driver.Queryer, query string, nvdargs []driver.NamedValue) (driver.Rows, error) {
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if queryerCtx != nil {
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return queryerCtx.QueryContext(ctx, query, nvdargs)
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}
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dargs, err := namedValueToValue(nvdargs)
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if err != nil {
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return nil, err
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}
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select {
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default:
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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return queryer.Query(query, dargs)
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}
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func ctxDriverStmtExec(ctx context.Context, si driver.Stmt, nvdargs []driver.NamedValue) (driver.Result, error) {
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if siCtx, is := si.(driver.StmtExecContext); is {
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return siCtx.ExecContext(ctx, nvdargs)
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}
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dargs, err := namedValueToValue(nvdargs)
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if err != nil {
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return nil, err
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}
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select {
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default:
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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return si.Exec(dargs)
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}
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func ctxDriverStmtQuery(ctx context.Context, si driver.Stmt, nvdargs []driver.NamedValue) (driver.Rows, error) {
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if siCtx, is := si.(driver.StmtQueryContext); is {
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return siCtx.QueryContext(ctx, nvdargs)
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}
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dargs, err := namedValueToValue(nvdargs)
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if err != nil {
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return nil, err
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}
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select {
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default:
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case <-ctx.Done():
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return nil, ctx.Err()
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}
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return si.Query(dargs)
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}
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var errLevelNotSupported = errors.New("sql: selected isolation level is not supported")
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func ctxDriverBegin(ctx context.Context, opts *TxOptions, ci driver.Conn) (driver.Tx, error) {
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if ciCtx, is := ci.(driver.ConnBeginTx); is {
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dopts := driver.TxOptions{}
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if opts != nil {
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dopts.Isolation = driver.IsolationLevel(opts.Isolation)
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dopts.ReadOnly = opts.ReadOnly
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}
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return ciCtx.BeginTx(ctx, dopts)
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}
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if opts != nil {
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// Check the transaction level. If the transaction level is non-default
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// then return an error here as the BeginTx driver value is not supported.
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if opts.Isolation != LevelDefault {
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return nil, errors.New("sql: driver does not support non-default isolation level")
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}
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// If a read-only transaction is requested return an error as the
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// BeginTx driver value is not supported.
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if opts.ReadOnly {
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return nil, errors.New("sql: driver does not support read-only transactions")
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}
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}
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if ctx.Done() == nil {
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return ci.Begin()
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}
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txi, err := ci.Begin()
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if err == nil {
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select {
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default:
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case <-ctx.Done():
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txi.Rollback()
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return nil, ctx.Err()
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}
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}
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return txi, err
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}
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func namedValueToValue(named []driver.NamedValue) ([]driver.Value, error) {
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dargs := make([]driver.Value, len(named))
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for n, param := range named {
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if len(param.Name) > 0 {
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return nil, errors.New("sql: driver does not support the use of Named Parameters")
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}
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dargs[n] = param.Value
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}
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return dargs, nil
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}
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