diff --git a/Providers/FreeSql.Provider.Custom/SqlServer/Curd/CustomSqlServerUpdate.cs b/Providers/FreeSql.Provider.Custom/SqlServer/Curd/CustomSqlServerUpdate.cs
index dc02dfcae..3811c04d8 100644
--- a/Providers/FreeSql.Provider.Custom/SqlServer/Curd/CustomSqlServerUpdate.cs
+++ b/Providers/FreeSql.Provider.Custom/SqlServer/Curd/CustomSqlServerUpdate.cs
@@ -90,7 +90,7 @@ protected override void ToSqlCase(StringBuilder caseWhen, ColumnInfo[] primarys)
 			foreach (var pk in primarys)
 			{
 				if (pkidx > 0) caseWhen.Append(" + '+' + ");
-				caseWhen.Append("cast(").Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name))).Append(" as varchar)");
+				caseWhen.Append("cast(").Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name))).Append(" as varchar(2000))");
 				++pkidx;
 			}
 			caseWhen.Append(")");
@@ -107,7 +107,7 @@ protected override void ToSqlWhen(StringBuilder sb, ColumnInfo[] primarys, objec
 			foreach (var pk in primarys)
 			{
 				if (pkidx > 0) sb.Append(" + '+' + ");
-				sb.Append("cast(").Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d))).Append(" as varchar)");
+				sb.Append("cast(").Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d))).Append(" as varchar(2000))");
 				++pkidx;
 			}
 		}
diff --git a/Providers/FreeSql.Provider.Odbc/SqlServer/Curd/OdbcSqlServerUpdate.cs b/Providers/FreeSql.Provider.Odbc/SqlServer/Curd/OdbcSqlServerUpdate.cs
index c0a07c188..b131cf71a 100644
--- a/Providers/FreeSql.Provider.Odbc/SqlServer/Curd/OdbcSqlServerUpdate.cs
+++ b/Providers/FreeSql.Provider.Odbc/SqlServer/Curd/OdbcSqlServerUpdate.cs
@@ -90,7 +90,7 @@ protected override void ToSqlCase(StringBuilder caseWhen, ColumnInfo[] primarys)
 			foreach (var pk in primarys)
 			{
 				if (pkidx > 0) caseWhen.Append(" + '+' + ");
-				caseWhen.Append("cast(").Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name))).Append(" as varchar)");
+				caseWhen.Append("cast(").Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name))).Append(" as varchar(2000))");
 				++pkidx;
 			}
 			caseWhen.Append(")");
@@ -107,7 +107,7 @@ protected override void ToSqlWhen(StringBuilder sb, ColumnInfo[] primarys, objec
 			foreach (var pk in primarys)
 			{
 				if (pkidx > 0) sb.Append(" + '+' + ");
-				sb.Append("cast(").Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d))).Append(" as varchar)");
+				sb.Append("cast(").Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d))).Append(" as varchar(2000))");
 				++pkidx;
 			}
 		}
diff --git a/Providers/FreeSql.Provider.SqlServer/Curd/SqlServerUpdate.cs b/Providers/FreeSql.Provider.SqlServer/Curd/SqlServerUpdate.cs
index 1dd7a5e0a..ae4710db4 100644
--- a/Providers/FreeSql.Provider.SqlServer/Curd/SqlServerUpdate.cs
+++ b/Providers/FreeSql.Provider.SqlServer/Curd/SqlServerUpdate.cs
@@ -90,7 +90,7 @@ protected override void ToSqlCase(StringBuilder caseWhen, ColumnInfo[] primarys)
             foreach (var pk in primarys)
             {
                 if (pkidx > 0) caseWhen.Append(" + '+' + ");
-                caseWhen.Append("cast(").Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name))).Append(" as varchar)");
+                caseWhen.Append("cast(").Append(_commonUtils.RereadColumn(pk, _commonUtils.QuoteSqlName(pk.Attribute.Name))).Append(" as varchar(2000))");
                 ++pkidx;
             }
             caseWhen.Append(")");
@@ -107,7 +107,7 @@ protected override void ToSqlWhen(StringBuilder sb, ColumnInfo[] primarys, objec
             foreach (var pk in primarys)
             {
                 if (pkidx > 0) sb.Append(" + '+' + ");
-                sb.Append("cast(").Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d))).Append(" as varchar)");
+                sb.Append("cast(").Append(_commonUtils.FormatSql("{0}", pk.GetDbValue(d))).Append(" as varchar(2000))");
                 ++pkidx;
             }
         }