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database/sql: allow drivers to only implement Context variants

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Drivers shouldn't need to implement both Queryer and QueryerContext,
they should just implement QueryerContext. Same with Execer and
ExecerContext. This CL tests for QueryContext and ExecerContext
first so drivers do not need to implement Queryer and Execer
with an empty definition.

Fixes #21663

Change-Id: Ifbaa71da669f4bc60f8da8c41a04a4afed699a9f
Reviewed-on: https://go-review.googlesource.com/65733
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Daniel Theophanes 2017-09-23 19:38:32 -07:00
parent 89a7adf8e4
commit 532714829e
3 changed files with 143 additions and 13 deletions
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11
src/database/sql/ctxutil.go
View file

@ -26,8 +26,8 @@ func ctxDriverPrepare(ctx context.Context, ci driver.Conn, query string) (driver
return si, err
}
func ctxDriverExec(ctx context.Context, execer driver.Execer, query string, nvdargs []driver.NamedValue) (driver.Result, error) {
if execerCtx, is := execer.(driver.ExecerContext); is {
func ctxDriverExec(ctx context.Context, execerCtx driver.ExecerContext, execer driver.Execer, query string, nvdargs []driver.NamedValue) (driver.Result, error) {
if execerCtx != nil {
return execerCtx.ExecContext(ctx, query, nvdargs)
}
dargs, err := namedValueToValue(nvdargs)
@ -43,10 +43,9 @@ func ctxDriverExec(ctx context.Context, execer driver.Execer, query string, nvda
return execer.Exec(query, dargs)
}
func ctxDriverQuery(ctx context.Context, queryer driver.Queryer, query string, nvdargs []driver.NamedValue) (driver.Rows, error) {
if queryerCtx, is := queryer.(driver.QueryerContext); is {
ret, err := queryerCtx.QueryContext(ctx, query, nvdargs)
return ret, err
func ctxDriverQuery(ctx context.Context, queryerCtx driver.QueryerContext, queryer driver.Queryer, query string, nvdargs []driver.NamedValue) (driver.Rows, error) {
if queryerCtx != nil {
return queryerCtx.QueryContext(ctx, query, nvdargs)
}
dargs, err := namedValueToValue(nvdargs)
if err != nil {