diff --git a/README.md b/README.md
index 777f5d5..443d094 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 ### 支持跨服的权限限时插件
 
 #### 构建地址:[http://ci.frog.gg/jenkins/job/PermissionsTime/](http://ci.frog.gg/jenkins/job/PermissionsTime/)
+#### 前置插件SQLibrary下载地址:[https://dev.bukkit.org/projects/sqlibrary](https://dev.bukkit.org/projects/sqlibrary/)
 
 #### 已知问题(作者提醒):
 
@@ -27,6 +28,7 @@
 - **gui显示自己的权限包**
 - 手动删除过期的或无效数据
 - 语言支持整理
+- 取消前置插件
 
 
 - 支持分页?
diff --git a/src/main/gg/frog/mc/permissionstime/PluginMain.java b/src/main/gg/frog/mc/permissionstime/PluginMain.java
index 2d86468..fbe437d 100644
--- a/src/main/gg/frog/mc/permissionstime/PluginMain.java
+++ b/src/main/gg/frog/mc/permissionstime/PluginMain.java
@@ -62,10 +62,12 @@ public class PluginMain extends JavaPlugin {
         getServer().getScheduler().runTask(pm, new Runnable() {
             public void run() {
                 if (!checkPluginDepends()) {
+                    getServer().getConsoleSender().sendMessage(StrUtil.messageFormat(PluginCfg.PLUGIN_PREFIX + "启动失败!"));
                     getServer().getPluginManager().disablePlugin(pm);
                 } else {
                     registerListeners();
                     registerCommands();
+                    getServer().getConsoleSender().sendMessage(StrUtil.messageFormat(PluginCfg.PLUGIN_PREFIX + "启动成功!"));
                 }
             }
         });
diff --git a/src/main/gg/frog/mc/permissionstime/command/MainCommand.java b/src/main/gg/frog/mc/permissionstime/command/MainCommand.java
index 41450a2..7080f41 100644
--- a/src/main/gg/frog/mc/permissionstime/command/MainCommand.java
+++ b/src/main/gg/frog/mc/permissionstime/command/MainCommand.java
@@ -29,7 +29,7 @@ public class MainCommand implements CommandExecutor {
             if (sender instanceof Player) {
                 isPlayer = true;
             }
-            if (args[0].equalsIgnoreCase("help") || args.length == 0) {
+            if (args.length == 0 || args[0].equalsIgnoreCase("help")) {
                 getHelp(sender, isPlayer);
                 return true;
             } else {
diff --git a/src/main/gg/frog/mc/permissionstime/database/SqlManager.java b/src/main/gg/frog/mc/permissionstime/database/SqlManager.java
index cc7c67f..fc5b447 100644
--- a/src/main/gg/frog/mc/permissionstime/database/SqlManager.java
+++ b/src/main/gg/frog/mc/permissionstime/database/SqlManager.java
@@ -28,7 +28,7 @@ public class SqlManager {
     }
 
     public boolean updateDatabase() {
-        if (db != null && db.isOpen()) {
+        if (db != null) {
             db.close();
         }
         if (PluginCfg.USE_MYSQL) {
@@ -38,7 +38,7 @@ public class SqlManager {
             db = new SQLite(PluginMain.LOG, "[" + pm.PLUGIN_NAME + "] ", pm.getDataFolder().getAbsolutePath(), "playerData", ".db");
             pds = new SqlitePlayerDataDao(pm, this);
         }
-        if(db.open()) {
+        if (db.open()) {
             try {
                 if (!pds.tableExist()) {
                     pds.creatTable();
diff --git a/src/main/gg/frog/mc/permissionstime/utils/database/DatabaseUtil.java b/src/main/gg/frog/mc/permissionstime/utils/database/DatabaseUtil.java
index 9d311c3..5261471 100644
--- a/src/main/gg/frog/mc/permissionstime/utils/database/DatabaseUtil.java
+++ b/src/main/gg/frog/mc/permissionstime/utils/database/DatabaseUtil.java
@@ -1,5 +1,6 @@
 package gg.frog.mc.permissionstime.utils.database;
 
+import gg.frog.mc.permissionstime.config.PluginCfg;
 import gg.frog.mc.permissionstime.database.SqlManager;
 import lib.PatPeter.SQLibrary.Database;
 
@@ -13,13 +14,15 @@ public abstract class DatabaseUtil {
 
     protected Database getDB() {
         Database db = sm.getDb();
-        for (int i = 0; i < 3; i++) {
-            if (!db.isOpen()) {
-                if (db.open()) {
+        if (PluginCfg.USE_MYSQL) {
+            for (int i = 0; i < 3; i++) {
+                if (!db.isOpen()) {
+                    if (db.open()) {
+                        return db;
+                    }
+                } else {
                     return db;
                 }
-            } else {
-                return db;
             }
         }
         return db;