Allon Mureinik has posted comments on this change.
Change subject: core: Exaple: Use UUID for handling database Guids
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Patch Set 1: (4 inline comments)
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File
backend/manager/modules/dal/src/main/java/org/ovirt/engine/core/dao/BaseDAODbFacade.java
Line 122: * @throws SQLException If resultSet does not contain columnName
or its value cannot be cast to {@link UUID}.
Line 123: */
Line 124: private static Guid getGuid(ResultSet resultSet, String
columnName, Guid defaultValue) throws SQLException {
Line 125: UUID uuid = (UUID) resultSet.getObject(columnName);
Line 126: if (uuid == null || resultSet.wasNull()) {
it's a good defensive practice to check both
Line 127: return defaultValue;
Line 128: }
Line 129: return new Guid(uuid);
Line 130: }
Line 130: }
Line 131:
Line 132: /**
Line 133: * Returns a {@link Guid} representing the column's value or a
<code>null</code>
Line 134: * if the column was <code>null</code>.
it's not a field - it's a column in the result set.
Line 135: *
Line 136: * <b>Note:</b> Postgres' driver returns a {@link UUID} when
{@link ResultSet#getObject(String)} is called on a
Line 137: * uuid column. This behavior is trusted to work with Postgres
8.x and 9.x and is used to achieve the best
Line 138: * performance. If it is ever broken on Postgres' side, this
method should be rewritten.
Line 134: * if the column was <code>null</code>.
Line 135: *
Line 136: * <b>Note:</b> Postgres' driver returns a {@link UUID} when
{@link ResultSet#getObject(String)} is called on a
Line 137: * uuid column. This behavior is trusted to work with Postgres
8.x and 9.x and is used to achieve the best
Line 138: * performance. If it is ever broken on Postgres' side, this
method should be rewritten.
I did not understand this comment.
Can you elaborate.
Line 139: *
Line 140: * @param resultSet the ResultSet to extract the result from.
Line 141: * @param columnName the name of the column.
Line 142: * @return a {@link Guid} representing the UUID in the column, or
the default value if it was <code>null</code>.
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Commit Message
Line 3: AuthorDate: 2013-07-01 08:50:39 +0300
Line 4: Commit: Allon Mureinik <[email protected]>
Line 5: CommitDate: 2013-07-01 09:33:41 +0300
Line 6:
Line 7: core: Exaple: Use UUID for handling database Guids
thanks, will fix.
Line 8:
Line 9: The Postgres JDBC Driver natively supports the java.lang.UUID type as a
Line 10: representation of a database uuid, in both directions -
Line 11: 1. ResultSet#getOtbject(int) and ResultSet#getObject(String) return a
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Gerrit-MessageType: comment
Gerrit-Change-Id: I4d30e1ab7303ecad68dbc9005ac5c6ef733f1707
Gerrit-PatchSet: 1
Gerrit-Project: ovirt-engine
Gerrit-Branch: master
Gerrit-Owner: Allon Mureinik <[email protected]>
Gerrit-Reviewer: Alissa Bonas <[email protected]>
Gerrit-Reviewer: Allon Mureinik <[email protected]>
Gerrit-Reviewer: Greg Padgett <[email protected]>
Gerrit-Reviewer: Liran Zelkha <[email protected]>
Gerrit-Reviewer: Maor Lipchuk <[email protected]>
Gerrit-Reviewer: Mike Kolesnik <[email protected]>
Gerrit-Reviewer: Tal Nisan <[email protected]>
Gerrit-Reviewer: Yair Zaslavsky <[email protected]>
Gerrit-Reviewer: oVirt Jenkins CI Server
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