diff --git a/src/modules/pages/connection/connection_jdbc/connection_jdbc.ts b/src/modules/pages/connection/connection_jdbc/connection_jdbc.ts
index 4dc6d0e..f28f9ec 100644
--- a/src/modules/pages/connection/connection_jdbc/connection_jdbc.ts
+++ b/src/modules/pages/connection/connection_jdbc/connection_jdbc.ts
@@ -182,9 +182,9 @@ export class ConnectionJdbc extends BI.Widget {
                             unit: BI.i18nText('BI-Basic_Seconds'),
                         }, {
                             type: FormItem.xtype,
-                            invisible: BI.parseInt(fetchSize) < 0,
+                            invisible: fetchSize < 0 && fetchSize !== -2,
                             name: 'Fetchsize',
-                            value: fetchSize,
+                            value: fetchSize === -2 ? '' : fetchSize,
                         },
                     ],
                 },
diff --git a/src/modules/pages/maintain/forms/components/form.jdbc.ts b/src/modules/pages/maintain/forms/components/form.jdbc.ts
index c73ff73..9f4262b 100644
--- a/src/modules/pages/maintain/forms/components/form.jdbc.ts
+++ b/src/modules/pages/maintain/forms/components/form.jdbc.ts
@@ -712,7 +712,7 @@ export class FormJdbc extends BI.Widget {
                             el: {
                                 type: BI.VerticalLayout.xtype,
                                 cls: 'bi-border-top',
-                                invisible: BI.parseInt(fetchSize) < 0,
+                                invisible: fetchSize < 0 && fetchSize !== -2,
                                 items: [
                                     {
                                         el: {
@@ -723,7 +723,7 @@ export class FormJdbc extends BI.Widget {
                                                 $value: 'fetch-size',
                                                 width: 300,
                                                 allowBlank: true,
-                                                value: fetchSize,
+                                                value: fetchSize === -2 ? '' : fetchSize,
                                                 watermark: 'Fetchsize',
                                                 validationChecker: [{
                                                     errorText: BI.i18nText('Dec-Dcm_Connection_Check_Fetch_Size_Range'),
@@ -857,7 +857,7 @@ export class FormJdbc extends BI.Widget {
                 creator: Dec ? Dec.personal.username : '',
                 principal: this.form.principal.getValue(),
                 keyPath: this.form.keyPath.getValue(),
-                fetchSize: BI.parseInt(this.form.fetchSize.getValue()),
+                fetchSize: BI.isEmptyString(this.form.fetchSize.getValue()) ? -2 : BI.parseInt(this.form.fetchSize.getValue()),
                 connectionPoolAttr: {
                     initialSize: this.form.initialSize.getValue(),
                     maxActive: this.form.maxActive.getValue(),