Question Re: Entityframework Core Scaffold Database Model Stuck in Technology Q&A

Entityframework Core Scaffold Database Model Stuck

kerria — Fri, 15 Dec 2023 16:27:04 GMT

I can't scaffold with Sap.EntityFrameworkCore.Hana.

v7.0, the process stuck for hours

Re: Entityframework Core Scaffold Database Model Stuck

minghai_chang — Fri, 15 Dec 2023 18:19:38 GMT

Hello,

Which client version are you using? Did you specify the "Current Schema", schemas, or tables? Here are some examples:

1. Install the Visual Studio PMC tools or the .NET CLI tools. Follow instructions of "Prerequisites" on

https://learn.microsoft.com/en-us/ef/core/managing-schemas/scaffolding/?tabs=vs

2. Create a .NET 6 C# console app (using Visual Studio 2022). Add

Sap.Data.Hana.Core.v2.1.dll and Sap.EntityFrameworkCore.Hana.v7.0.dll to the Project Reference.

3. Open a command prompt and CD <csproj directory>. Run the .NET CLI commands to scaffold entity types.

dotnet ef dbcontext scaffold "Server=<my-server:30015>;uid=<uid>;pwd=<pwd>r;Current Schema=DEMO" Sap.EntityFrameworkCore.Hana.v7.0

dotnet ef dbcontext scaffold "Server=<my-server:30015>;uid=<uid>;pwd=<pwd>" Sap.EntityFrameworkCore.Hana.v7.0 --schema DEMO --schema SYSTEM

dotnet ef dbcontext scaffold "Server=<my-server:30015>;uid=<uid>;pwd=<pwd>" Sap.EntityFrameworkCore.Hana.v7.0 --table Blogs --table Posts

Kind regards,

Minghai Chang

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Mon, 18 Dec 2023 04:32:27 GMT

i'm using .NET 7.

For SAP Client -> Sap.Data.Hana.Core.v2.1 and Sap.EntityFrameworkCore.Hana.v7.0.

1. dotnet ef dbcontext scaffold "Server=<my-server:30015>;uid=<uid>;pwd=<pwd>r;Current Schema=DEMO" Sap.EntityFrameworkCore.Hana.v7.0

2. dotnet ef dbcontext scaffold "Server=<my-server:30015>;uid=<uid>;pwd=<pwd>" Sap.EntityFrameworkCore.Hana.v7.0 --schema DEMO --schema SYSTEM

3. dotnet ef dbcontext scaffold "Server=<my-server:30015>;uid=<uid>;pwd=<pwd>" Sap.EntityFrameworkCore.Hana.v7.0 --table Blogs --table Posts

for the first and second methods it keeps getting stuck, for the third method it works but not as expected.

The DbContext generated but Model for table not generated.

It's there way to scaffold for the schemas? because if using --table option, i must scaffold one per one each table and it's using to much time

Re: Entityframework Core Scaffold Database Model Stuck

minghai_chang — Mon, 18 Dec 2023 15:38:44 GMT

Hello,

We have fixed some issues related to EF Core Scaffolding. Can you please try the latest HANA Client?

Kind regards,

Minghai Chang

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Mon, 18 Dec 2023 20:25:37 GMT

i have tried the latest version. It's work for several table but some other table doesn't.

# version of Hana Client

# Scaffold CLI

# Table REF_SSBP

With the latest version of Hana Client, can i scaffold just using schema for several table?

Re: Entityframework Core Scaffold Database Model Stuck

minghai_chang — Mon, 18 Dec 2023 22:36:39 GMT

Hello,

Yes, you can just specify several tables to scaffold the model (e.g. the 3rd example).

The first error looks like some tables are owned by different schemas. The second error looks like REF_SSBP table doesn't have primary key.

Kind regards,

Minghai Chang

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Tue, 19 Dec 2023 05:57:22 GMT

but if i use 3rd example, that means i must set --table for each table? isn't that inefficient? i mean in this project we have tables more than 100.

table that mention in error are in the same schema, i think why error occurs because class model for table not generated, that's why i need scaffold using 'schema'.

table REF_SSBP of course have Primary Key

------------

Disclaimer

this is the old system that need rejuvenate, previously we use ADO.NET at .NET Framework for scaffold model. but since .NET Core / .NET has launched we must change everything that related to .NET Framework to .NET Core / .NET.

At ADO.NET we can select the schema we want to scaffold. Since it's using Gui we just checked the checkbox of schema name and click button okey at visual studio.

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Tue, 19 Dec 2023 10:07:33 GMT

But if i use 3rd example, that means i must set --table for each table? isn't that inefficient? i mean in this project we have tables more than 100.

Table that mention in error are in the same schema, i think why error occurs because class model for table not generated, that's why i need scaffold using 'schema'.

# table REF_SSBP of course have Primary Key

---------------------------

Disclaimer

At ADO.NET we can select the schema we want to scaffold. Since it's using Gui we just checked the checkbox of schema name and click button okey at visual studio.

Re: Entityframework Core Scaffold Database Model Stuck

minghai_chang — Tue, 19 Dec 2023 19:32:14 GMT

Hello,

Unfortunately, the EF Core scaffolding only has command line options. It doesn't has GUI tool. Is it possible to use the combination of schemas and tables to scaffold your model? I mean you could add the referenced tables using table options. Could you post the schema of REF_SSBP table so we can test it?

Kind regards.

Minghai Chang

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Wed, 20 Dec 2023 03:06:26 GMT

I'm not problem with only CLI. i'm just want tell when using ado.net we can scaffold by schema so several table can be generated at once, and don't have problem anything.

What my problem is 'Can i scaffold using --schema options'. Because when i use --schema options, it's say 'Hana doesn't support schema'

Unfortunately I can't post the entire schema, because it's written in my contract not to post anything.

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Thu, 21 Dec 2023 09:37:43 GMT

Haii it's me again. I tried scaffold with --schema option, and i think it's work because i found new error.

When i searched there's only one with column 'ID_HIS_TUKIN'

# Here's detail data

SCHEMA_NAME : TDES
TABLE_NAME : HIS_TUKIN
TABLE_OID : 1,270,955
COLUMN_NAME : ID_HIS_TUKIN
POSITION : 1
DATA_TYPE_ID : 12
DATA_TYPE_NAME : VARCHAR
OFFSET : 72
LENGTH : 32
SCALE : [NULL]
IS_NULLABLE : FALSE
DEFAULT_VALUE : SYSUUID
COLLATION :
COMMENTS : [NULL]
MAX_VALUE : [NULL]
MIN_VALUE : [NULL]
CS_DATA_TYPE_ID : 83
CS_DATA_TYPE_NAME : STRING
DDIC_DATA_TYPE_ID : 32
DDIC_DATA_TYPE_NAME : INVALID
COMPRESSION_TYPE : DEFAULT
INDEX_TYPE : FULL
COLUMN_ID : 1,294,853
PRELOAD : FALSE
GENERATED_ALWAYS_AS : [NULL]
HAS_SCHEMA_FLEXIBILITY : FALSE
FUZZY_SEARCH_INDEX : FALSE
FUZZY_SEARCH_MODE : [NULL]
MEMORY_THRESHOLD : [NULL]
LOAD_UNIT : DEFAULT
GENERATION_TYPE : [NULL]
IS_CACHABLE : FALSE
IS_CACHE_KEY : FALSE
ROW_ORDER_POSITION : [NULL]
IS_HIDDEN : FALSE
IS_MASKED : FALSE
MASK_EXPRESSION : [NULL]
CLIENTSIDE_ENCRYPTION_STATUS : [NULL]
CLIENTSIDE_ENCRYPTION_COLUMN_KEY_ID : [NULL]
CLIENTSIDE_ENCRYPTION_MODE : [NULL]
PERSISTENT_MEMORY : [NULL]
NUMA_NODE_INDEXES : [NULL]

# Here;s DDL from the table HIS_TUKIN

Re: Entityframework Core Scaffold Database Model Stuck

minghai_chang — Tue, 02 Jan 2024 22:34:48 GMT

Hello,

Sorry for not getting back to you sooner. I tried to create the HIS_TUKIN table with the schema. But it always fails with the following error.

"sql syntax error: incorrect syntax near: line 5 col 21 (at pos 136)"

If I remove all CS_ types, I can create the table and scaffold code for it.

Which server version are you using? Do you know of any configuration settings which can enable the use of CS_ types?

Kind regards,

Minghai Chang

Re: Entityframework Core Scaffold Database Model Stuck

kerria — Mon, 29 Jan 2024 06:32:36 GMT

Server version i've using is 2.00.074.00.1698716871, and for configuration about CS_types i think is default from begining because nether i don't know anything about CS_types