Add CodeFirst.SetStringDefaultLength

Src/Asp.Net/SqlServerTest/Demos/5_CodeFirst.cs

@@ -15,7 +15,6 @@ namespace OrmTest.Demo
         public int Id { get; set; }
         [SugarColumn(Length = 21,OldColumnName = "Name2")]
         public string Name{ get; set; }
-        [SugarColumn(IsNullable = true,Length =10)]
         public string IsOk { get; set; }
         public Guid Guid { get; set; }
         [SugarColumn(ColumnDataType ="int")]
@@ -51,7 +50,7 @@ namespace OrmTest.Demo
             //db.CodeFirst.BackupTable().InitTables(typeof(CodeTable),typeof(CodeTable2));
 
             //No backup table
-            db.CodeFirst.InitTables(typeof(CodeTable),typeof(CodeTable2));
+            db.CodeFirst.SetStringDefaultLength(10).InitTables(typeof(CodeTable),typeof(CodeTable2));
         }
     }
 }

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

@@ -11,6 +11,7 @@ namespace SqlSugar
         public virtual SqlSugarClient Context { get; set; }
         private bool IsBackupTable { get; set; }
         private int MaxBackupDataRows { get; set; }
+        private int DefultLength { get; set; }
         #endregion
 
         #region Public methods
@@ -20,6 +21,12 @@ namespace SqlSugar
             this.MaxBackupDataRows = maxBackupDataRows;
             return this;
         }
+
+        public virtual ICodeFirst SetStringDefaultLength(int length) {
+            DefultLength = length;
+            return this;
+        }
+
         public virtual void InitTables(Type entityType)
         {
 
@@ -67,6 +74,14 @@ namespace SqlSugar
         protected virtual void Execute(Type entityType)
         {
             var entityInfo = this.Context.EntityMaintenance.GetEntityInfo(entityType);
+            if (this.DefultLength > 0) {
+                foreach (var item in entityInfo.Columns)
+                {
+                    if (item.PropertyInfo.PropertyType == UtilConstants.StringType && item.DataType.IsNullOrEmpty()&& item.Length==0) {
+                        item.Length = DefultLength;
+                    }
+                }
+            }
             var tableName = GetTableName(entityInfo);
             var isAny = this.Context.DbMaintenance.IsAnyTable(tableName);
             if (isAny)

Src/Asp.Net/SqlSugar/Interface/ICodeFirst.cs

@@ -8,6 +8,7 @@ namespace SqlSugar
     {
         SqlSugarClient Context { get; set; }
         ICodeFirst BackupTable(int maxBackupDataRows=int.MaxValue);
+        ICodeFirst SetStringDefaultLength(int length);
         void InitTables(string entitiesNamespace);
         void InitTables(string [] entitiesNamespaces);
         void InitTables(params Type [] entityTypes);