SNOW-978164: Fix stmt.Exec for DML (#978)

connection.go

@@ -60,6 +60,13 @@ const (
 	queryResultType     resultType = "query"
 )
 
+type execKey string
+
+const (
+	executionType          execKey = "executionType"
+	executionTypeStatement string  = "statement"
+)
+
 const privateLinkSuffix = "privatelink.snowflakecomputing.com"
 
 type snowflakeConn struct {
@@ -333,8 +340,17 @@ func (sc *snowflakeConn) ExecContext(
 		}, nil // last insert id is not supported by Snowflake
 	} else if isMultiStmt(&data.Data) {
 		return sc.handleMultiExec(ctx, data.Data)
+	} else if isDql(&data.Data) {
+		logger.WithContext(ctx).Debugf("DQL")
+		if isStatementContext(ctx) {
+			return &snowflakeResultNoRows{queryID: data.Data.QueryID}, nil
+		}
+		return driver.ResultNoRows, nil
 	}
 	logger.Debug("DDL")
+	if isStatementContext(ctx) {
+		return &snowflakeResultNoRows{queryID: data.Data.QueryID}, nil
+	}
 	return driver.ResultNoRows, nil
 }
 

connection_util.go

@@ -197,7 +197,14 @@ func isDml(v int64) bool {
 	return statementTypeIDDml <= v && v <= statementTypeIDMultiTableInsert
 }
 
+func isDql(data *execResponseData) bool {
+	return data.StatementTypeID == statementTypeIDSelect && !isMultiStmt(data)
+}
+
 func updateRows(data execResponseData) (int64, error) {
+	if data.RowSet == nil {
+		return 0, nil
+	}
 	var count int64
 	for i, n := 0, len(data.RowType); i < n; i++ {
 		v, err := strconv.ParseInt(*data.RowSet[0][i], 10, 64)
@@ -292,3 +299,8 @@ func (sc *snowflakeConn) setupOCSPPrivatelink(app string, host string) error {
 	}
 	return nil
 }
+
+func isStatementContext(ctx context.Context) bool {
+	v := ctx.Value(executionType)
+	return v == executionTypeStatement
+}

result.go

@@ -2,6 +2,8 @@
 
 package gosnowflake
 
+import "errors"
+
 type queryStatus string
 
 const (
@@ -73,3 +75,19 @@ func (res *snowflakeResult) waitForAsyncExecStatus() error {
 	}
 	return nil
 }
+
+type snowflakeResultNoRows struct {
+	queryID string
+}
+
+func (*snowflakeResultNoRows) LastInsertId() (int64, error) {
+	return 0, errors.New("no LastInsertId available")
+}
+
+func (*snowflakeResultNoRows) RowsAffected() (int64, error) {
+	return 0, errors.New("no RowsAffected available")
+}
+
+func (rnr *snowflakeResultNoRows) GetQueryID() string {
+	return rnr.queryID
+}

statement.go

@@ -34,17 +34,7 @@ func (stmt *snowflakeStmt) NumInput() int {
 
 func (stmt *snowflakeStmt) ExecContext(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
 	logger.WithContext(stmt.sc.ctx).Infoln("Stmt.ExecContext")
-	result, err := stmt.sc.ExecContext(ctx, stmt.query, args)
-	if err != nil {
-		stmt.setQueryIDFromError(err)
-		return nil, err
-	}
-	r, ok := result.(SnowflakeResult)
-	if !ok {
-		return nil, fmt.Errorf("interface convertion. expected type SnowflakeResult but got %T", result)
-	}
-	stmt.lastQueryID = r.GetQueryID()
-	return result, err
+	return stmt.execInternal(ctx, args)
 }
 
 func (stmt *snowflakeStmt) QueryContext(ctx context.Context, args []driver.NamedValue) (driver.Rows, error) {
@@ -64,11 +54,25 @@ func (stmt *snowflakeStmt) QueryContext(ctx context.Context, args []driver.Named
 
 func (stmt *snowflakeStmt) Exec(args []driver.Value) (driver.Result, error) {
 	logger.WithContext(stmt.sc.ctx).Infoln("Stmt.Exec")
-	result, err := stmt.sc.Exec(stmt.query, args)
+	return stmt.execInternal(context.Background(), toNamedValues(args))
+}
+
+func (stmt *snowflakeStmt) execInternal(ctx context.Context, args []driver.NamedValue) (driver.Result, error) {
+	logger.WithContext(stmt.sc.ctx).Debugln("Stmt.execInternal")
+	if ctx == nil {
+		ctx = context.Background()
+	}
+	stmtCtx := context.WithValue(ctx, executionType, executionTypeStatement)
+	result, err := stmt.sc.ExecContext(stmtCtx, stmt.query, args)
 	if err != nil {
 		stmt.setQueryIDFromError(err)
 		return nil, err
 	}
+	rnr, ok := result.(*snowflakeResultNoRows)
+	if ok {
+		stmt.lastQueryID = rnr.GetQueryID()
+		return driver.ResultNoRows, nil
+	}
 	r, ok := result.(SnowflakeResult)
 	if !ok {
 		return nil, fmt.Errorf("interface convertion. expected type SnowflakeResult but got %T", result)

statement_test.go

@@ -40,6 +40,102 @@ func openConn(t *testing.T) *sql.Conn {
 	return conn
 }
 
+func TestExecStmt(t *testing.T) {
+	dqlQuery := "SELECT 1"
+	dmlQuery := "INSERT INTO TestDDLExec VALUES (1)"
+	ddlQuery := "CREATE OR REPLACE TABLE TestDDLExec (num NUMBER)"
+	multiStmtQuery := "DELETE FROM TestDDLExec;\n" +
+		"SELECT 1;\n" +
+		"SELECT 2;"
+	ctx := context.Background()
+	multiStmtCtx, err := WithMultiStatement(ctx, 3)
+	if err != nil {
+		t.Error(err)
+	}
+	runDBTest(t, func(dbt *DBTest) {
+		dbt.mustExec(ddlQuery)
+		defer dbt.mustExec("DROP TABLE IF EXISTS TestDDLExec")
+		testcases := []struct {
+			name  string
+			query string
+			f     func(stmt driver.Stmt) (any, error)
+		}{
+			{
+				name:  "dql Exec",
+				query: dqlQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.Exec(nil)
+				},
+			},
+			{
+				name:  "dql ExecContext",
+				query: dqlQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.(driver.StmtExecContext).ExecContext(ctx, nil)
+				},
+			},
+			{
+				name:  "ddl Exec",
+				query: ddlQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.Exec(nil)
+				},
+			},
+			{
+				name:  "ddl ExecContext",
+				query: ddlQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.(driver.StmtExecContext).ExecContext(ctx, nil)
+				},
+			},
+			{
+				name:  "dml Exec",
+				query: dmlQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.Exec(nil)
+				},
+			},
+			{
+				name:  "dml ExecContext",
+				query: dmlQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.(driver.StmtExecContext).ExecContext(ctx, nil)
+				},
+			},
+			{
+				name:  "multistmt ExecContext",
+				query: multiStmtQuery,
+				f: func(stmt driver.Stmt) (any, error) {
+					return stmt.(driver.StmtExecContext).ExecContext(multiStmtCtx, nil)
+				},
+			},
+		}
+		for _, tc := range testcases {
+			t.Run(tc.name, func(t *testing.T) {
+				err := dbt.conn.Raw(func(x any) error {
+					stmt, err := x.(driver.ConnPrepareContext).PrepareContext(ctx, tc.query)
+					if err != nil {
+						t.Error(err)
+					}
+					if stmt.(SnowflakeStmt).GetQueryID() != "" {
+						t.Error("queryId should be empty before executing any query")
+					}
+					if _, err := tc.f(stmt); err != nil {
+						t.Errorf("should have not failed to execute the query, err: %s\n", err)
+					}
+					if stmt.(SnowflakeStmt).GetQueryID() == "" {
+						t.Error("should have set the query id")
+					}
+					return nil
+				})
+				if err != nil {
+					t.Fatal(err)
+				}
+			})
+		}
+	})
+}
+
 func TestFailedQueryIdInSnowflakeError(t *testing.T) {
 	failingQuery := "SELECTT 1"
 	failingExec := "INSERT 1 INTO NON_EXISTENT_TABLE"