Re: AW: [dtp-dev] column definitions with suffix

[Hemant S Kolwalkar <hskolwal@xxxxxxxxxx>]

Hi Adrian,

it's open source, so it's really
owned by the community at large, especially if we're talking about dbdefinitions
for new vendors, proposing enhancements, defect fixes, etc. but the base
definitions is mainly the responsibility of DTP.  

thanks,

- Hemant

"Goerler, Adrian" <adrian.goerler@xxxxxxx>
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07/18/2007 12:15 AM

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Subject	AW: [dtp-dev] column definitions with suffix

Hi Hemant,
 
thanks for the clarification.
In this case we don't have to provide a DDLGenerator for MaxDB but can
use the "displayName". I'll file a defect for DB2 UDB.
 
One more question: who, in general,
is/feels responsible for the database-definitions. The DTP team? The database
vendors? The community?
 
Best regards,
 
Adrian

---

Von: dtp-dev-bounces@xxxxxxxxxxx
[mailto:dtp-dev-bounces@xxxxxxxxxxx] Im Auftrag von Hemant S Kolwalkar
Gesendet: Dienstag, 17. Juli 2007 19:22
An: DTP development mailing list
Cc: dtp-dev@xxxxxxxxxxx; dtp-dev-bounces@xxxxxxxxxxx
Betreff: Re: [dtp-dev] column definitions with suffix


Hi Adrian, 

the DDL Generator should be using the following method from DatabaseDefinition.
For CHAR () FOR BIT DATA,
the length gets plugged in in this method. 

public String getPredefinedDataTypeFormattedName(PredefinedDataType
predefinedDataType); 

and meta-data in the DB2 UDB dbdefinition for CHAR () FOR BIT DATA should
have the displayName entries as below. though i see them missing in the
DB2 UDB database definitions and that could explain the behavior you are
seeing with DB2 UDB. please open a defect for this.

<predefinedDataTypeDefinitions
xmi:id="BINARY_1"
lengthSupported="true"
 defaultLength="1"
displayNameSupported="true"
displayName="CHAR
({0}) FOR BIT DATA" keyConstraintSupported="true"
maximumLength="254"
primitiveType="BINARY"
jdbcEnumType="-2"
javaClassName="byte[]">
    <defaultValueTypes>NULL</defaultValueTypes>
    <name>CHAR
FOR BIT DATA</name>
    <name>CHARACTER
FOR BIT DATA</name>
    <name>CHAR
() FOR BIT DATA</name>
    <name>CHARACTER
() FOR BIT DATA</name>
  </predefinedDataTypeDefinitions>

thanks, 

- Hemant

"Goerler, Adrian" <adrian.goerler@xxxxxxx>
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07/17/2007 02:22 AM

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Subject	[dtp-dev] column definitions with suffix

Hi DTP-team,

we are currently facing the following issue:

Some database, namely "DB2 UDB iSeries",  "DB2 UDB" and  "DB2 UDB zSeries", have database definitions that contain column definitions with a suffix (e.g. CHAR () FOR BIT DATA).

examples:

DB2 UDB:

<predefinedDataTypeDefinitions xmi:id="BINARY_1" lengthSupported="true"  defaultLength="1" displayNameSupported="true" displayName="CHAR ({0}) FOR BIT DATA" keyConstraintSupported="true" maximumLength="254" primitiveType="BINARY" jdbcEnumType="-2" javaClassName="byte[]">

    <defaultValueTypes>NULL</defaultValueTypes>
  <name>CHAR FOR BIT DATA</name>
  <name>CHARACTER FOR BIT DATA</name>
  <name>CHAR () FOR BIT DATA</name>         <-------
  <name>CHARACTER () FOR BIT DATA</name>    <-------
</predefinedDataTypeDefinitions>
 

DB2 UDB zSeries:

  <predefinedDataTypeDefinitions xmi:id="BINARY_VARYING_1" lengthSupported="true" defaultLength="1" keyConstraintSupported="true" primitiveType="BINARY_VARYING" jdbcEnumType="-3" javaClassName="byte[]">

    <defaultValueTypes>NULL</defaultValueTypes>
  <name>VARCHAR () FOR BIT DATA</name>              <-------
  <name>CHARACTER VARYING () FOR BIT DATA</name>    <-------
  <name>CHAR VARYING () FOR BIT DATA</name>         <-------
</predefinedDataTypeDefinitions>

These databases don't provide a platform-specific DDL generator. If you trigger DDL generation (on the context menu of the datasource explorer) the GenericDDLGenerator is used. It renders

"VARCHAR () FOR BIT DATA (<length>)" instead of  "VARCHAR (<length>) FOR BIT DATA",

for binary types, which is not understood by the database.

We are currently developing a database definition for (MySQL/SAP) MaxDB. Here we are also having data types that require a postfix (e.g. VARCHAR (<length>) UNICODE). We could fix the issue for MaxDB by providing a MaxDB-specific DDLGenarator, but we think it could be addressed within DTP.

We are now a bit puzzled how to get this right and have the following questions:

- Should this issue be addressed by database-specific DDL generators (to be provided) for the individual databases or could it be addressed in the GenericDDLGenerator?

- What is the meaning of the properties "displayNameSupported" and "displayName"? Should these properties be evaluated by the GenericDDLGenerator to infix the length parameter?

Could anyone help us with a clarification?

Thanks and best regards,

Adrian

Adrian Görler
SAP AG
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D-69190 Walldorf, Germany
T   +49 6227 747474
http://www.sap.com

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