Monday, December 27, 2010

Generating db patches with DiffKit

In the 0.8.7 release, DiffKit gained the ability to generate database "patches". These patches are analogous to the patch files produced by traditional *nix diff tools-- they can be read by a patching tool in order to edit the RHS so that it is identical to the LHS.
Table 1. DiffKit versus Diffutils
diff tool patch format patch tool
DiffKit
diffkit-app
sql DML
any DML applicator
Diffutils
diff
unidiff
patch
The "patch" files produced by DiffKit contain only INSERT, DELETE, and UPDATE statements. After the user applies those DML statements to the RHS table, using whichever tools and techniques they prefer, the RHS table will have identical contents to the LHS table. The DiffKit application will never directly modify your tables-- DiffKit is strictly a read-only application from the perspective of your table data.
DB patches are created by using a new Sink implementation: the SqlPatchSink. test26.plan.xml, in the eg/ (examples) folder, dmonstrates this:
test26.plan.xml
   ...
      <property name="sqlPatchFilePath" value="./test26.sink.patch" />
   ...
invoked this way:
java -jar ../diffkit-app.jar -planfiles test26.plan.xml,dbConnectionInfo.xml
produces this output in the patch file:
test26.sink.patch
DELETE FROM PUBLIC.TEST26_RHS_TABLE
WHERE (COLUMN1='1' );

INSERT INTO PUBLIC.TEST26_RHS_TABLE (COLUMN1, COLUMN2, COLUMN3, COLUMN4)
VALUES ('2', 'xxxx', 2, 'zz2zz');

UPDATE PUBLIC.TEST26_RHS_TABLE
SET COLUMN3=3
WHERE (COLUMN1='3' );

UPDATE PUBLIC.TEST26_RHS_TABLE
SET COLUMN2='5555', COLUMN3=4, COLUMN4='zz4zz'
WHERE (COLUMN1='4' );

INSERT INTO PUBLIC.TEST26_RHS_TABLE (COLUMN1, COLUMN2, COLUMN3, COLUMN4)
VALUES ('5', 'xxxx', 5, 'zz5zz');

DELETE FROM PUBLIC.TEST26_RHS_TABLE
WHERE (COLUMN1='6' );

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  2. I get this error when executing:

    planfile(s)->[test26.plan.xml, dbConnectionInfo.xml]
    ERROR[11:28:42.101]{main}(DKApplication.main:135)-null
    java.lang.RuntimeException: java.lang.RuntimeException: Could not resolve automatically; need rule for dependency->Dependency[(DKPassthroughPlan,null)]
    at org.diffkit.diff.conf.DKMagicPlan.getBuiltPlan(DKMagicPlan.java:353) [diffkit-app.jar:na]

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  3. Got the below error. Any help ?

    java.lang.RuntimeException: java.lang.RuntimeException: Could not resolve automatically; need rule for dependency->Dependency[(DKPassthroughPlan,null)]
    at org.diffkit.diff.conf.DKMagicPlan.getBuiltPlan(DKMagicPlan.java:353) [bin/:na]
    at org.diffkit.diff.conf.DKMagicPlan.getLhsSource(DKMagicPlan.java:330) [bin/:na]
    ..
    ..
    ..

    Caused by: org.diffkit.common.DKConstructorNotFoundException: more than one longest Constructor: public java.lang.String(byte[],int,int,java.nio.charset.Charset) & public java.lang.String(byte[],int,int,java.lang.String) throws java.io.UnsupportedEncodingException
    at org.diffkit.util.DKClassUtil.findLongestConstructor(DKClassUtil.java:283) [bin/:na]
    at org.diffkit.diff.conf.DKMagicDependency.findConstructor(DKMagicDependency.java:205) [bin/:na]

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