Fix named value building.

Author: arthurschreiber

Diff for: go/logic/applier.go

@@ -1234,46 +1234,68 @@ func (this *Applier) ApplyDMLEventQueries(dmlEvents [](*binlog.BinlogDMLEvent))
 		if _, err := tx.Exec(sessionQuery); err != nil {
 			return rollback(err)
 		}
-		rowDeltas := make([]int64, 0, len(dmlEvents))
-		multiArgs := []driver.NamedValue{}
-		var multiQueryBuilder strings.Builder
+
+		buildResults := make([]*dmlBuildResult, 0, len(dmlEvents))
 		for _, dmlEvent := range dmlEvents {
 			for _, buildResult := range this.buildDMLEventQuery(dmlEvent) {
 				if buildResult.err != nil {
 					return rollback(buildResult.err)
 				}
-				for _, arg := range buildResult.args {
-					multiArgs = append(multiArgs, driver.NamedValue{Value: driver.Value(arg)})
-				}
-				rowDeltas = append(rowDeltas, buildResult.rowsDelta)
-				multiQueryBuilder.WriteString(buildResult.query)
-				multiQueryBuilder.WriteString(";\n")
+
+				buildResults = append(buildResults, buildResult)
 			}
 		}
 
-		//this.migrationContext.Log.Infof("Executing query: %s, args: %+v", multiQueryBuilder.String(), multiArgs)
 		execErr := conn.Raw(func(driverConn any) error {
 			ex, ok := driverConn.(driver.ExecerContext)
 			if !ok {
 				return fmt.Errorf("could not cast driverConn to ExecerContext")
 			}
+
+			nvc, ok := driverConn.(driver.NamedValueChecker)
+			if !ok {
+				return fmt.Errorf("could not cast driverConn to NamedValueChecker")
+			}
+
+			var multiArgs []driver.NamedValue
+			multiQueryBuilder := strings.Builder{}
+			var rowDeltas []int64
+
+			for _, buildResult := range buildResults {
+				for _, arg := range buildResult.args {
+					nv := driver.NamedValue{Value: driver.Value(arg)}
+					nvc.CheckNamedValue(&nv)
+					multiArgs = append(multiArgs, nv)
+				}
+
+				multiQueryBuilder.WriteString(buildResult.query)
+				multiQueryBuilder.WriteString(";\n")
+
+				rowDeltas = append(rowDeltas, buildResult.rowsDelta)
+			}
+
+			// this.migrationContext.Log.Infof("Executing query: %s, args: %+v", multiQueryBuilder.String(), multiArgs)
 			res, err := ex.ExecContext(ctx, multiQueryBuilder.String(), multiArgs)
 			if err != nil {
 				err = fmt.Errorf("%w; query=%s; args=%+v", err, multiQueryBuilder.String(), multiArgs)
 				this.migrationContext.Log.Errorf("Error exec: %+v", err)
 				return err
 			}
+
 			mysqlRes, ok := res.(drivermysql.Result)
 			if !ok {
 				return fmt.Errorf("Could not cast %+v to mysql.Result", res)
 			}
+
 			// each DML is either a single insert (delta +1), update (delta +0) or delete (delta -1).
 			// multiplying by the rows actually affected (either 0 or 1) will give an accurate row delta for this DML event
 			for i, rowsAffected := range mysqlRes.AllRowsAffected() {
 				totalDelta += rowDeltas[i] * rowsAffected
 			}
+
 			return nil
 		})
+
 		if execErr != nil {
 			return rollback(execErr)
 		}