fix issue in gqueue in closing channel for limited queue

g/container/gqueue/gqueue.go

@@ -46,7 +46,7 @@ func New(limit ...int) *Queue {
 	q := &Queue{
 		closed: gtype.NewBool(),
 	}
-	if len(limit) > 0 {
+	if len(limit) > 0 && limit[0] > 0 {
 		q.limit = limit[0]
 		q.C = make(chan interface{}, limit[0])
 	} else {
@@ -87,7 +87,7 @@ func (q *Queue) startAsyncLoop() {
 			<-q.events
 		}
 	}
-	// It should be here to close q.C.
+	// It should be here to close q.C if <q> is unlimited size.
 	// It's the sender's responsibility to close channel when it should be closed.
 	close(q.C)
 }
@@ -119,6 +119,9 @@ func (q *Queue) Close() {
 	if q.events != nil {
 		close(q.events)
 	}
+	if q.limit > 0 {
+		close(q.C)
+	}
 	for i := 0; i < gDEFAULT_MAX_BATCH_SIZE; i++ {
 		q.Pop()
 	}

g/database/gdb/gdb_unit_types_test.go

@@ -0,0 +1,35 @@
+// Copyright 2019 gf Author(https://github.com/gogf/gf). All Rights Reserved.
+//
+// This Source Code Form is subject to the terms of the MIT License.
+// If a copy of the MIT was not distributed with this file,
+// You can obtain one at https://github.com/gogf/gf.
+
+package gdb_test
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/gogf/gf/g/test/gtest"
+)
+
+func Test_Types(t *testing.T) {
+	if _, err := db.Exec(fmt.Sprintf(`
+    CREATE TABLE types (
+        id      int(10) unsigned NOT NULL AUTO_INCREMENT,
+        blob    blob NOT NULL,
+        binary  binary(8) NOT NULL ,
+        date    varchar(45) NOT NULL ,
+        decimal decimal(5,2) NOT NULL ',
+        double  double NOT NULL ',
+        bit     bit(2) NOT NULL ',
+        PRIMARY KEY (id)
+    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+    `)); err != nil {
+		gtest.Error(err)
+	}
+
+	gtest.Case(t, func() {
+
+	})
+}