diff --git a/build_helper/build.js b/build_helper/build.js
index ce0a8ab..79b745e 100644
--- a/build_helper/build.js
+++ b/build_helper/build.js
@@ -44,7 +44,6 @@ generateParser = function () {
             'src/grammar/select_join.pegjs',
             'src/grammar/update.pegjs',
             'src/grammar/open.pegjs',
-            'src/grammar/is_db_exist.pegjs',
             'src/grammar/common.pegjs',
             'src/grammar/constant.pegjs'
         ]);
diff --git a/package-lock.json b/package-lock.json
index d92b3f8..aac2688 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
   "name": "sqlweb",
-  "version": "1.4.1",
+  "version": "1.5.0",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
@@ -3668,9 +3668,9 @@
       "dev": true
     },
     "jsstore": {
-      "version": "3.11.0",
-      "resolved": "https://registry.npmjs.org/jsstore/-/jsstore-3.11.0.tgz",
-      "integrity": "sha512-GpbzcIomtBtpeW76pf2tOdHA6+lroudVseoanruDjh94gf453GRRcTrA1qtCREMVDBgIcz0fSmaKYFX/pBQ5HQ==",
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/jsstore/-/jsstore-4.0.4.tgz",
+      "integrity": "sha512-JowsFZc2VQ28/ZJy/kFZNA6C3o1yRRcqgQ1E6fPoyMXQrRyLkiPOlxSgtZBOFm0A8w9NrL4NXV/evSX2H75n0A==",
       "dev": true
     },
     "karma": {
diff --git a/package.json b/package.json
index 008b3eb..b308368 100644
--- a/package.json
+++ b/package.json
@@ -39,7 +39,7 @@
   "devDependencies": {
     "chai": "^4.2.0",
     "fs-extra": "^7.0.1",
-    "jsstore": "^3.11.0",
+    "jsstore": "^4.0.4",
     "karma": "^4.1.0",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^2.2.0",
@@ -57,6 +57,6 @@
     "webpack-merge": "^4.2.1"
   },
   "peerDependencies": {
-    "jsstore": ">=3.11.0"
+    "jsstore": ">=4.0.3"
   }
 }
diff --git a/src/grammar/index.pegjs b/src/grammar/index.pegjs
index b4d12ce..cc5c659 100644
--- a/src/grammar/index.pegjs
+++ b/src/grammar/index.pegjs
@@ -1,2 +1,2 @@
-query = selectQuery/countQuery/insertQuery/updateQuery/removeQuery/createQuery/openQuery/isDbExistQuery ;
+query = selectQuery/countQuery/insertQuery/updateQuery/removeQuery/createQuery/openQuery ;
 
diff --git a/src/grammar/is_db_exist.pegjs b/src/grammar/is_db_exist.pegjs
deleted file mode 100644
index f83b863..0000000
--- a/src/grammar/is_db_exist.pegjs
+++ /dev/null
@@ -1,23 +0,0 @@
-isDbExistQuery =  ISDBEXIST _* name:dbName _* tblInfo: tableInfo? {
-	var result = {
-     	api:'isDbExist'
-    }
-    if(tblInfo==null){
-      result.data=name;
-    }
-    else{
-    	result.data={
-            dbName:name,
-            table:tblInfo
-        }
-    }
-    return result;
-}
-
-tableInfo = TABLE _* table:tableName _* ver:version {
-	return {
-                name:table,
-                version:ver
-                }
-}
-
diff --git a/test/cases/create/demo.js b/test/cases/create/demo.js
index 3494a61..86b008d 100644
--- a/test/cases/create/demo.js
+++ b/test/cases/create/demo.js
@@ -1,24 +1,15 @@
 describe('create demo database', function () {
     it('use isexist and then open/create db', function (done) {
         console.log('initiate database');
-        con.$sql.run('isDbExist Demo').then(function (isExist) {
-            console.log('db exist :' + isExist);
-            if (isExist) {
-                con.$sql.run('openDb Demo').then(function () {
-                    console.log('Database opened');
-                    done();
-                });
-            } else {
-                var query = getDbSchema();
-                con.$sql.run(query).then(function () {
-                    console.log('Database created');
-                    done();
-                });
-            }
+        var query = getDbSchema();
+        con.$sql.run(query).then(function (isDbCreated) {
+            console.log('Database created');
+            expect(isDbCreated).equal(true);
+            done();
         }).catch(function (err) {
             done(err);
         });
-    });
+    })
 });
 
 // con.jsStoreCon_.isDbExist('Demo').then(function (exist) {
diff --git a/test/cases/delete/delete.js b/test/cases/delete/delete.js
index 732bc00..29be9f1 100644
--- a/test/cases/delete/delete.js
+++ b/test/cases/delete/delete.js
@@ -1,263 +1,266 @@
 describe('Test delete Api', function () {
     it('delete with where', function (done) {
         var count;
+        con.logStatus = true;
         con.$sql.run("count from Customers where Country = 'Sweden'").
-        then(function (results) {
-            count = results
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                count = results
+            }).catch(function (err) {
+                done(err);
+            })
 
         con.$sql.run("delete from Customers where Country = 'Sweden'").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (err) {
+                done(err);
+            })
+
+        // console.log("request queue", con.req)
     });
 
     it('remove with or', function (done) {
 
         var count;
         con.$sql.run("Count * from Customers where Country='Mexico' || City='Madrid'").
-        then(function (results) {
-            count = results;
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (err) {
+                done(err);
+            })
 
         con.$sql.run("deLete from Customers where Country='Mexico' || City='Madrid'").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (err) {
+                done(err);
+            })
     });
 
     it('remove with in', function (done) {
 
         var count;
         con.$sql.run("count from Customers where Country in ('Germany', 'France', 'UK')").
-        then(function (results) {
-            count = results;
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (err) {
+                done(err);
+            })
 
         con.$sql.run("delete from Customers where Country in ('Germany', 'France', 'UK')").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (err) {
+                done(err);
+            })
     });
 
     it('remove with operator - != (for string)', function (done) {
         var count;
 
         con.$sql.run("count from Customers where Country != 'Mexico'").
-        then(function (results) {
-            count = results;
-        }).catch(function (err) {
-            done(err);
-        });
+            then(function (results) {
+                count = results;
+            }).catch(function (err) {
+                done(err);
+            });
 
         con.$sql.run("delete from Customers where Country != 'Mexico'").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (err) {
-            done(err);
-        });
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (err) {
+                done(err);
+            });
     });
 
     it('remove with operator - != (for number)', function (done) {
         var count;
         con.$sql.run("count from Products where Price!=20").
-        then(function (results) {
-            count = results;
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (err) {
+                done(err);
+            })
 
         con.$sql.run("delete from Products where Price!=20").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (err) {
+                done(err);
+            })
     });
 
     it('remove with operator - >', function (done) {
 
         var count;
         con.$sql.run("count from Products where Price>20").
-        then(function (results) {
-            count = results;
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (results) {
+                done(err);
+            })
 
         con.$sql.run("delete from Products where Price>20").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (results) {
+                done(err);
+            })
     });
 
     it('remove with operator - >=', function (done) {
 
         var count;
         con.$sql.run("count from Products where Price>=20").
-        then(function (results) {
-            count = results;
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (results) {
+                done(err);
+            })
 
         con.$sql.run("delete from Products where Price>=20").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (results) {
+                done(err);
+            })
     });
 
     it('remove with operator - <', function (done) {
 
         var count;
         con.$sql.run("count from Products where Price<20").
-        then(function (results) {
-            count = results;
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (results) {
+                done(err);
+            })
 
         con.$sql.run("DELETE from Products where Price<20").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (results) {
+                done(err);
+            })
     });
 
     it('remove with operator - <=', function (done) {
         var count;
         con.$sql.run("count from Products where Price<=20").
-        then(function (results) {
-            count = results;
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (results) {
+                done(err);
+            })
 
         con.$sql.run("DELETE from Products where Price<=20").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (results) {
+                done(err);
+            })
     });
 
     it('remove with operator - between', function (done) {
         var count;
 
         con.$sql.run("count from Products where Price betWeen (10,20)").
-        then(function (results) {
-            count = results;
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (results) {
+                done(err);
+            })
 
         con.$sql.run("delete from Products where Price betWeen (10,20)").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (results) {
+                done(err);
+            })
     });
 
     it('remove with like- "%or%"', function (done) {
         var count;
 
         con.$sql.run("count from Customers where CustomerName like '%or%' ").
-        then(function (results) {
-            count = results;
-            done();
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+                done();
+            }).catch(function (err) {
+                done(err);
+            })
 
         con.$sql.run("delete from Customers where CustomerName like '%or%' ").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (err) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (err) {
+                done(err);
+            })
     });
 
     it('remove with like- "%or"', function (done) {
         var count;
         con.$sql.run("count from Customers where CustomerName like '%or' ").
-        then(function (results) {
-            count = results;
-            con.$sql.run("delete from Customers where CustomerName like '%or' ").
             then(function (results) {
-                expect(results).to.be.an('number').to.equal(count);
-                done();
+                count = results;
+                con.$sql.run("delete from Customers where CustomerName like '%or' ").
+                    then(function (results) {
+                        expect(results).to.be.an('number').to.equal(count);
+                        done();
+                    }).catch(function (results) {
+                        done(err);
+                    })
             }).catch(function (results) {
                 done(err);
-            })
-        }).catch(function (results) {
-            done(err);
-        });
+            });
 
     });
 
     it('remove with like- "or%"', function (done) {
         var count;
         con.$sql.run("count from Customers where CustomerName like 'or%' ").
-        then(function (results) {
-            count = results;
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                count = results;
+            }).catch(function (results) {
+                done(err);
+            })
 
         con.$sql.run("delete from Customers where CustomerName like 'or%' ").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(count);
-            done();
-        }).catch(function (results) {
-            done(err);
-        })
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(count);
+                done();
+            }).catch(function (results) {
+                done(err);
+            })
     });
 
     it('remove all - using promise', function (done) {
         var Count;
         con.$sql.run("count from Customers").
-        then(function (results) {
-            Count = results;
-        }).catch(function (results) {
-            done(err);
-        });
+            then(function (results) {
+                Count = results;
+            }).catch(function (results) {
+                done(err);
+            });
         con.$sql.run("delete from Customers").
-        then(function (results) {
-            expect(results).to.be.an('number').to.equal(Count);
-            done();
-        }).
-        catch(function (err) {
-            done(err);
-        });
+            then(function (results) {
+                expect(results).to.be.an('number').to.equal(Count);
+                done();
+            }).
+            catch(function (err) {
+                done(err);
+            });
 
     });
 
diff --git a/test/cases/update/update_with_operator.js b/test/cases/update/update_with_operator.js
index 14a8bfc..20534f7 100644
--- a/test/cases/update/update_with_operator.js
+++ b/test/cases/update/update_with_operator.js
@@ -8,13 +8,14 @@ describe('Test update with operator option', function () {
                 ProductID: 1
             }
         }).
-        then(function (results) {
-            Price = results[0].Price;
-        }).catch(function (err) {
-            done(err);
-        });
+            then(function (results) {
+                Price = results[0].Price;
+            }).catch(function (err) {
+                done(err);
+            });
 
-        con.update({ in: "Products",
+        con.update({
+            in: "Products",
             set: {
                 Price: {
                     '+': 5
@@ -55,7 +56,8 @@ describe('Test update with operator option', function () {
             done(err);
         });
 
-        con.update({ in: "Products",
+        con.update({
+            in: "Products",
             set: {
                 Price: {
                     '-': 5
@@ -95,7 +97,8 @@ describe('Test update with operator option', function () {
         }).catch(function (err) {
             done(err);
         });
-        con.update({ in: "Products",
+        con.update({
+            in: "Products",
             set: {
                 Price: {
                     '*': 5
@@ -135,7 +138,8 @@ describe('Test update with operator option', function () {
         }).catch(function (err) {
             done(err);
         });
-        con.update({ in: "Products",
+        con.update({
+            in: "Products",
             set: {
                 Price: {
                     '/': 5
@@ -175,7 +179,8 @@ describe('Test update with operator option', function () {
         }).catch(function (err) {
             done(err);
         });
-        con.update({ in: "Products",
+        con.update({
+            in: "Products",
             set: {
                 ProductName: {
                     '+': 'temp'
@@ -204,7 +209,8 @@ describe('Test update with operator option', function () {
     });
 
     it('update with wrong operator - #', function (done) {
-        con.update({ in: "Products",
+        con.update({
+            in: "Products",
             set: {
                 ProductName: {
                     '#': 'temp'
@@ -213,8 +219,6 @@ describe('Test update with operator option', function () {
             where: {
                 ProductID: 1
             }
-        }).then(function (results) {
-            expect(results).to.be.an('number').to.equal(1);
         }).catch(function (err) {
             var error = {
                 "message": "Supplied value for column 'ProductName' have wrong data type",