Query order execution fix

src/ios/SQLitePlugin.m

@@ -22,6 +22,8 @@ @implementation SQLitePlugin
 
 @synthesize openDBs;
 @synthesize appDBPaths;
+@synthesize commandCache;
+@synthesize processingCache;
 
 -(void)pluginInitialize
 {
@@ -30,6 +32,8 @@ -(void)pluginInitialize
     {
         openDBs = [NSMutableDictionary dictionaryWithCapacity:0];
         appDBPaths = [NSMutableDictionary dictionaryWithCapacity:0];
+        commandCache = [NSMutableArray arrayWithCapacity:0];
+        processingCache = NO;
 #if !__has_feature(objc_arc)
         [openDBs retain];
         [appDBPaths retain];
@@ -242,13 +246,33 @@ -(void)deleteNow: (CDVInvokedUrlCommand*)command
 }
 
 
--(void) backgroundExecuteSqlBatch: (CDVInvokedUrlCommand*)command
+-(void) processCache
 {
+    processingCache = YES;
     [self.commandDelegate runInBackground:^{
-        [self executeSqlBatchNow: command];
+        @synchronized (self) {
+            if (commandCache.count) {
+                CDVInvokedUrlCommand* cachedCmd = [commandCache objectAtIndex:0];
+                [commandCache removeObjectAtIndex:0];
+                [self executeSqlBatchNow: cachedCmd];
+            }
+            else {
+                processingCache = NO;
+            }
+        }
     }];
 }
 
+
+-(void) backgroundExecuteSqlBatch: (CDVInvokedUrlCommand*)command
+{
+    @synchronized (self) {
+        [commandCache addObject:command];
+        if (!processingCache)
+            [self processCache];
+    }
+}
+
 -(void) executeSqlBatchNow: (CDVInvokedUrlCommand*)command
 {
     NSMutableDictionary *options = [command.arguments objectAtIndex:0];
@@ -283,6 +307,7 @@ -(void) executeSqlBatchNow: (CDVInvokedUrlCommand*)command
     }
 
     [self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
+    [self processCache];
 }
 
 -(void) backgroundExecuteSql: (CDVInvokedUrlCommand*)command