Update Code First

Src/Asp.Net/SqlSugar/Abstract/CodeFirstProvider/CodeFirstProvider.cs

@@ -10,6 +10,7 @@ namespace SqlSugar
     public partial class CodeFirstProvider : ICodeFirst
     {
         #region Properties
+        internal static object LockObject = new object();
         public virtual SqlSugarProvider Context { get; set; }
         protected bool IsBackupTable { get; set; }
         protected int MaxBackupDataRows { get; set; }
@@ -47,7 +48,10 @@ namespace SqlSugar
 
         public virtual void InitTables(Type entityType)
         {
-
+            //Prevent concurrent requests if used in your program
+            lock (CodeFirstProvider.LockObject)
+            {
+                MappingTableList oldTableList = CopyMappingTalbe();
                 //this.Context.Utilities.RemoveCacheAll();
                 this.Context.InitMappingInfoNoCache(entityType);
                 if (!this.Context.DbMaintenance.IsAnySystemTablePermissions())
@@ -69,7 +73,11 @@ namespace SqlSugar
                     Execute(entityType);
                 }
 
+                RestMappingTables(oldTableList);
             }
+
+        }
+
         public void InitTables<T>()
         {
             InitTables(typeof(T));
@@ -114,6 +122,10 @@ namespace SqlSugar
             {
                 MappingTables.Add(type,newTableName);
             }
+            else if (!MappingTables.ContainsKey(type))
+            {
+                MappingTables[type]= newTableName;
+            }
             return this;
         }
         public ICodeFirst As<T>(string newTableName)
@@ -443,6 +455,28 @@ namespace SqlSugar
         #endregion
 
         #region Helper methods
+        private void RestMappingTables(MappingTableList oldTableList)
+        {
+            this.Context.MappingTables.Clear();
+            foreach (var table in oldTableList)
+            {
+                this.Context.MappingTables.Add(table.EntityName, table.DbTableName);
+            }
+        }
+        private MappingTableList CopyMappingTalbe()
+        {
+            MappingTableList oldTableList = new MappingTableList();
+            if (this.Context.MappingTables == null) 
+            {
+                this.Context.MappingTables = new MappingTableList();
+            }
+            foreach (var table in this.Context.MappingTables)
+            {
+                oldTableList.Add(table.EntityName, table.DbTableName);
+            }
+            return oldTableList;
+        }
+
         public virtual string GetCreateTableString(EntityInfo entityInfo)
         {
             StringBuilder result = new StringBuilder();