Revert "database/sql: Use Tx.ctx in Tx non-context methods"

This reverts commit ef0f7fb9.

Reason for revert: Altered behavior of Queries prior to Tx commit. See #20631.

Change-Id: I2548507c2935a7c60b92aae377dcc8e9aca66331
Reviewed-on: https://go-review.googlesource.com/45231
Run-TryBot: Daniel Theophanes <kardianos@gmail.com>
Reviewed-by: Bulat Gaifullin <gaifullinbf@gmail.com>
Reviewed-by: Michael Hudson-Doyle <michael.hudson@canonical.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

src/database/sql/sql.go

@@ -1830,7 +1830,7 @@ func (tx *Tx) PrepareContext(ctx context.Context, query string) (*Stmt, error) {
 //
 // To use an existing prepared statement on this transaction, see Tx.Stmt.
 func (tx *Tx) Prepare(query string) (*Stmt, error) {
-	return tx.PrepareContext(tx.ctx, query)
+	return tx.PrepareContext(context.Background(), query)
 }
 
 // StmtContext returns a transaction-specific prepared statement from
@@ -1928,7 +1928,7 @@ func (tx *Tx) StmtContext(ctx context.Context, stmt *Stmt) *Stmt {
 // The returned statement operates within the transaction and will be closed
 // when the transaction has been committed or rolled back.
 func (tx *Tx) Stmt(stmt *Stmt) *Stmt {
-	return tx.StmtContext(tx.ctx, stmt)
+	return tx.StmtContext(context.Background(), stmt)
 }
 
 // ExecContext executes a query that doesn't return rows.
@@ -1947,7 +1947,7 @@ func (tx *Tx) ExecContext(ctx context.Context, query string, args ...interface{}
 // Exec executes a query that doesn't return rows.
 // For example: an INSERT and UPDATE.
 func (tx *Tx) Exec(query string, args ...interface{}) (Result, error) {
-	return tx.ExecContext(tx.ctx, query, args...)
+	return tx.ExecContext(context.Background(), query, args...)
 }
 
 // QueryContext executes a query that returns rows, typically a SELECT.
@@ -1965,7 +1965,7 @@ func (tx *Tx) QueryContext(ctx context.Context, query string, args ...interface{
 
 // Query executes a query that returns rows, typically a SELECT.
 func (tx *Tx) Query(query string, args ...interface{}) (*Rows, error) {
-	return tx.QueryContext(tx.ctx, query, args...)
+	return tx.QueryContext(context.Background(), query, args...)
 }
 
 // QueryRowContext executes a query that is expected to return at most one row.
@@ -1980,7 +1980,7 @@ func (tx *Tx) QueryRowContext(ctx context.Context, query string, args ...interfa
 // QueryRow always returns a non-nil value. Errors are deferred until
 // Row's Scan method is called.
 func (tx *Tx) QueryRow(query string, args ...interface{}) *Row {
-	return tx.QueryRowContext(tx.ctx, query, args...)
+	return tx.QueryRowContext(context.Background(), query, args...)
 }
 
 // connStmt is a prepared statement on a particular connection.

src/database/sql/sql_test.go

@@ -439,35 +439,6 @@ func TestTxContextWait(t *testing.T) {
 	waitForFree(t, db, 5*time.Second, 0)
 }
 
-// TestTxUsesContext tests the transaction behavior when the tx was created by context,
-// but for query execution used methods without context
-func TestTxUsesContext(t *testing.T) {
-	db := newTestDB(t, "people")
-	defer closeDB(t, db)
-
-	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Millisecond)
-	defer cancel()
-
-	tx, err := db.BeginTx(ctx, nil)
-	if err != nil {
-		// Guard against the context being canceled before BeginTx completes.
-		if err == context.DeadlineExceeded {
-			t.Skip("tx context canceled prior to first use")
-		}
-		t.Fatal(err)
-	}
-
-	// This will trigger the *fakeConn.Prepare method which will take time
-	// performing the query. The ctxDriverPrepare func will check the context
-	// after this and close the rows and return an error.
-	_, err = tx.Query("WAIT|1s|SELECT|people|age,name|")
-	if err != context.DeadlineExceeded {
-		t.Fatalf("expected QueryContext to error with context deadline exceeded but returned %v", err)
-	}
-
-	waitForFree(t, db, 5*time.Second, 0)
-}
-
 func TestMultiResultSetQuery(t *testing.T) {
 	db := newTestDB(t, "people")
 	defer closeDB(t, db)