UPDATE DbMaintenance

SqlSugar/Abstract/DbMaintenanceProvider/Methods.cs

@@ -50,6 +50,25 @@ namespace SqlSugar
         }
         #endregion
 
+        #region Check
+        public bool IsAnyTable(string tableName)
+        {
+            return true;
+        }
+        public bool IsAnyColumn(string tableName,string column)
+        {
+            return true;
+        }
+        public bool IsPrimaryKey(string tableName, string column)
+        {
+            return true;
+        }
+        public bool IsIdentity(string tableName, string column)
+        {
+            return true;
+        }
+        #endregion
+
         #region DDL
         public bool AddColumnToTable(string tableName, DbColumnInfo column)
         {
@@ -71,7 +90,7 @@ namespace SqlSugar
         public bool BackupDataBase()
         {
             throw new NotImplementedException();
-        } 
+        }
         #endregion
 
         #region Private

SqlSugar/Abstract/DbMaintenanceProvider/Properties.cs

@@ -19,8 +19,10 @@ namespace SqlSugar
 
         #region DDL
         protected abstract string AddColumnToTableSql { get; }
+        protected abstract string AlterColumnToTableSql { get; }
         protected abstract string BackupDataBaseSql { get; }
         protected abstract string CreateTableSql { get; }
+        protected abstract string CreateTableColumn { get; }
         protected abstract string BackupTableSql { get; }
         protected abstract string TruncateTableSql { get; } 
         #endregion

SqlSugar/Interface/IDbMaintenance.cs

@@ -8,6 +8,7 @@ namespace SqlSugar
     {
         SqlSugarClient Context { get; set; }
 
+        #region DML
         List<DbTableInfo> GetViewInfoList();
 
         List<DbTableInfo> GetTableInfoList();
@@ -17,7 +18,16 @@ namespace SqlSugar
         List<string> GetIsIdentities(string tableName);
 
         List<string> GetPrimaries(string tableName);
+        #endregion
 
+        #region Check
+        bool IsAnyTable(string tableName);
+        bool IsAnyColumn(string tableName, string column);
+        bool IsPrimaryKey(string tableName, string column);
+        bool IsIdentity(string tableName, string column);
+        #endregion
+
+        #region DDL
         bool TruncateTable(string tableName);
 
         bool CreateTable(string tableName, List<DbColumnInfo> columns);
@@ -25,5 +35,6 @@ namespace SqlSugar
         bool AddColumnToTable(string tableName, DbColumnInfo column);
 
         bool BackupDataBase();
+        #endregion
     }
 }

SqlSugar/Realization/SqlServer/DbMaintenance/SqlServerDbMaintenance.cs

@@ -82,6 +82,13 @@ namespace SqlSugar
                 return "ALERT TABLE {0} ADD {1} {2} {3}";
             }
         }
+        protected override string AlterColumnToTableSql {
+            get
+            {
+                return "ALERT TABLE {0} ALTER COLUMN {1}{2} {3} ";
+            }
+        }
+
         protected override string BackupDataBaseSql
         {
             get
@@ -93,8 +100,14 @@ namespace SqlSugar
         {
             get
             {
-                return @"CREATE TABLE {0}
+                return "CREATE TABLE {0}(\r\n{1})";
-                         {1}";
+            }
+        }
+        protected override string CreateTableColumn
+        {
+            get
+            {
+                return @"{0} {1}{2} {3}{4}\r\n";
             }
         }
         protected override string TruncateTableSql