Mapping tool creates new columns one at a time

Hi All,
I'm using Kodo 3.2.2 with MySql 4.1. I have a fairly large table (over
2million rows) representing one persistent class. I need to add several
new fields to the object, which will require a refresh mapping on the
database to add new columns for the fields.
It seems when I run refresh mapping on the database, Kodo is adding each
new field individually in seperate ALTER TABLE statements, rather than
adding all the columns in one ALTER TABLE statement.
With MySQL and large tables, this can really increase the time required to
refresh the mapping - I've tried with MSSQL and that database must handle
ALTER TABLE commands differently because it doesn't take a fraction of the
time that MySQL takes.
Is this a bug (I doubt it), but rather a feature improvement?
Thoughts?
Thanks,
Brendan

Thanks Abe for the reply - I've been meaning to look at the process of
creating SQL scripts to perform the refresh mappings on our databases.
I'll have a look at this process before we talk contracting!
Thanks,
Brendan
Abe White wrote:
Unfortunately, we don't have any immediate plans to optimize ALTER TABLEsince
it's not a runtime operation, and as you say most DBs don't have a problemwith
it. Also, note that the documentation shows how to get Kodo to create SQL
scripts rather than directly modify the DB; you could easily edit thescripts
Kodo generates to make them more efficient before piping the SQL to MySQLusing
its client app. (Note that Kodo 3.3 introduces the ability to generate SQL
scripts directly from the mapping tool, rather than having to take an extrastep
through the schema tool).
If getting Kodo to combine ALTER statements is important to you, you couldalso
contact [email protected] about contracting us to expedite this work.

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<field name="employee">
<extension vendor-name="kodo" key="jdbc-field-map"
value="one-one">
<extension vendor-name="kodo" key="column.ID" value="EMPLOYEE_ID"/>
</extension>
</field>
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<class name="TripImpJdo"
persistence-capable-superclass="trekwatch.core.security.AbstractPolicedObject"
objectid-class="TripImpJdoId">
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<extension vendor-name="kodo" key="table"
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<extension vendor-name="kodo" key="jdbc-field-mappings">
<extension vendor-name="kodo"
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<extension vendor-name="kodo" key="jdbc-field-map"
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<extension vendor-name="kodo" key="column"
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<extension vendor-name="kodo"
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<extension vendor-name="kodo" key="jdbc-field-map"
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<extension vendor-name="kodo" key="column"
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<extension vendor-name="kodo" key="jdbc-field-map"
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<extension vendor-name="kodo" key="jdbc-field-map"
value="pc">
<extension vendor-name="kodo" key="column"
value="COPYPOLICY"/>
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key="trekwatch.core.security.AbstractSecureTWObject.acl">
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<extension vendor-name="kodo" key="jdbc-field-map"
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<extension vendor-name="kodo" key="ref-column.ID"
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<extension vendor-name="kodo" key="jdbc-field-map"
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<extension vendor-name="kodo" key="column"
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<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="BUDGET"/>
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<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="BUDGETTYPE"/>
</extension>
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<field name="description">
<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="DESCRIPTION"/>
</extension>
</field>
<field name="endDate">
<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="ENDDATE"/>
</extension>
</field>
<field name="gearList">
<extension vendor-name="kodo" key="jdbc-delete-action"
value="null"/>
<extension vendor-name="kodo" key="jdbc-field-map"
value="one-one">
<extension vendor-name="kodo" key="column.ID"
value="GEARLIST_ID"/>
</extension>
</field>
<field name="name">
<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="NAME0"/>
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<field name="numDays">
<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="NUMDAYS"/>
</extension>
</field>
<field name="startDate">
<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="STARTDATE"/>
</extension>
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<field name="timeAvailable">
<extension vendor-name="kodo" key="jdbc-field-map"
value="value">
<extension vendor-name="kodo" key="column"
value="TIMEAVAILABLE"/>
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</field>
<field name="todoList">
<extension vendor-name="kodo" key="jdbc-field-map"
value="one-one">
<extension vendor-name="kodo" key="column.ID"
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<field name="tripElements">
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<extension vendor-name="kodo" key="jdbc-field-map"
value="pc-collection">
<extension vendor-name="kodo" key="element-column"
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<extension vendor-name="kodo" key="order-column"
value="TRIPELEMENTS_ORDER"/>
<extension vendor-name="kodo" key="ref-column.ID"
value="ID"/>
<extension vendor-name="kodo" key="table"
value="tripi_tripelements"/>
</extension>
</field>
</class>
<table name="tripimpjdo">
<pk column="ID"/>
<column name="ACL" type="varchar" size="255"/>
<column name="ATOMSIGNATURE" type="varchar" size="255"/>
<column name="AUTHORID" type="varchar" size="255"/>
<column name="BUDGET" type="integer"/>
<column name="BUDGETTYPE" type="integer"/>
<column name="COPYPOLICY" type="varchar" size="255"/>
<column name="DESCRIPTION" type="varchar" size="255"/>
<column name="ENDDATE" type="timestamp"/>
<column name="GEARLIST_ID" type="bigint"/>
<column name="ID" type="bigint" not-null="true"/>
<column name="JDOCLASS" type="varchar" size="255"/>
<column name="JDOVERSION" type="integer"/>
<column name="NAME0" type="varchar" size="255"/>
<column name="NUMDAYS" type="integer"/>
<column name="STARTDATE" type="timestamp"/>
<column name="TIMEAVAILABLE" type="integer"/>
<column name="TIMESTAMP0" type="timestamp"/>
<column name="TODOLIST_ID" type="bigint"/>
<fk delete-action="cascade" to-table="gearitemlist"
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<fk to-table="todolist" column="TODOLIST_ID"/>
<index name="I_TRPMPJD_GEARLIST_ID" column="GEARLIST_ID"/>
<index name="I_TRPMPJD_JDOCLASS" column="JDOCLASS"/>
<index name="I_TRPMPJD_JDOVERSION" column="JDOVERSION"/>
<index name="I_TRPMPJD_TODOLIST_ID" column="TODOLIST_ID"/>
</table>
create-schema:
[echo]
================================================================
[echo] Refreshing the schema in the data store
[echo]
================================================================
[mappingtool] 625 INFO [main] kodo.Tool - Mapping tool running on type
"class ***" with action "refresh".
[mappingtool] 1891 INFO [main] kodo.Tool - Mapping tool running on type
"class ***" with action "refresh".
[mappingtool] 1906 INFO [main] kodo.Tool - Mapping tool running on type
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(many more of the same as above for each persistent class.
[mappingtool] 2250 INFO [main] kodo.Tool - Recording mapping and schema
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[mappingtool] 5063 WARN [main] kodo.jdbc.Schema - The foreign key
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build:
BUILD SUCCESSFUL
Total time: 20 seconds
Marc Prud'hommeaux wrote:
Goerge-
As well as adding the jdbc-delete-action, you also want to set the
following in your kodo.properties:
kodo.jdbc.ForeignKeyConstraints: true
Also, I notice you are using MySQL: MySQL doesn't support some foreign
keys (such as deferred constraints). Is your foreign key deferred? Can
you post the schema.xml file, as well as the complete output from the
mappingtool so we can take a look at it?
In article <[email protected]>, Goerge wrote:
UPDATE again:
This dialog with myself is actually not bad.
Anyway, I've made some head way:
After reading through 16 pages of posts here, I found one with the same
problem I had, where it stated that foreign key constraints are not added
to the database unless a jdbc-delete-action extension is used.
After adding the following extension to the field in question, I still do
not get the foreign key in the database, but at least I get the following
message when running the mapping tool:
[mappingtool] 6157 WARN [main] kodo.jdbc.Schema - The foreign key
"F_TRPMPJD_GEARLIST" was not added to table "TRIPIMPJDO".
I am using MySQL with innodb tables, so foreign keys should be supported.
Is there another reason they are not being added?
Thanks again.
Marc Prud'hommeaux
SolarMetric Inc.

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