| java.lang.Object
 com.versant.core.jdbc.fetch.FetchSpec
| FetchSpec | | public class FetchSpec (Code) | | This specifies how each row from a SQL query is processed and helps to
generate the query. A FetchSpec contains a list of FetchOp's, each of
which fetch something from the ResultSet. FetchOp's may provide data
to other subsequent FetchOp's so complex operations can be broken down
into simple operations. A FetchOp may have a nested FetchSpec of its own
to be executed once for each row or in parallel with the 'parent'
FetchSpec.
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| Method Summary | |
| public void | addFetchOp(FetchOp op, boolean includeInResult)
Add a new FetchOp to this plan. | | public FetchResult | createFetchResult(JdbcStorageManager sm, Connection con, Object[] params, boolean forUpdate, boolean forCount, long fromIncl, long toExcl, int fetchSize, boolean scrollable)
Create a FetchResult to execute our query. | | public Object | createRow(FetchResultImp fetchResult)
Process the current row in fetchResult's ResultSet and return our
projection. | | public void | fetchResultClosed(FetchResult fetchResult)
This is invoked by one of our results when it is closed. | | public synchronized void | generateSQL()
Finish creating this spec and generate the SQL buffer for our query. | | public int | getFetchOpCount()
Get the number of FetchOp's in this spec. | | public FetchOptions | getOptions()
Get the default FetchOptions for this spec. | | public int[] | getProjectionTypes()
Get the types of the objects in our projection. | | public SelectExp | getRoot()
Get the topmost SELECT for this spec. | | public SqlDriver | getSqlDriver()
| | public boolean | isSingleObjectRow()
| | public void | printPlan(PrintStream p, String indent)
Print a user understandable description of this operation. | | public void | setParamList(SqlBuffer.Param paramList)
Set the compiled parameter info. | | public void | setSingleObjectRow(boolean singleObjectRow)
If singleObjectRow is true and the projection only has one Object
then this is returned as is and not in an Object[1]. |
| addFetchOp | | public void addFetchOp(FetchOp op, boolean includeInResult)(Code) | | Add a new FetchOp to this plan. If includeInResult is true the the
result of the op is included in the projection returned by the
FetchSpec.
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| createFetchResult | | public FetchResult createFetchResult(JdbcStorageManager sm, Connection con, Object[] params, boolean forUpdate, boolean forCount, long fromIncl, long toExcl, int fetchSize, boolean scrollable)(Code) | | Create a FetchResult to execute our query. This will execute the
query as soon as the data is needed.
Parameters:
forUpdate - Generate SELECT FOR UPDATE type query
Parameters:
forCount - Generate a COUNT(*) query to just count the rows
Parameters:
fromIncl - Index of first row to return
Parameters:
toExcl - Index of row after last row to return (-1 for all)
Parameters:
scrollable - Use a scrollable ResultSet
See Also: FetchResultImp.execute |
| createRow | | public Object createRow(FetchResultImp fetchResult)(Code) | | Process the current row in fetchResult's ResultSet and return our
projection.
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| fetchResultClosed | | public void fetchResultClosed(FetchResult fetchResult)(Code) | | This is invoked by one of our results when it is closed. We call
fetchResultClosed on all of our ops so they have a chance to close
any nested results.
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| generateSQL | | public synchronized void generateSQL()(Code) | | Finish creating this spec and generate the SQL buffer for our query.
This is a NOP if already done.
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| getFetchOpCount | | public int getFetchOpCount()(Code) | | Get the number of FetchOp's in this spec.
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| getOptions | | public FetchOptions getOptions()(Code) | | Get the default FetchOptions for this spec.
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| getProjectionTypes | | public int[] getProjectionTypes()(Code) | | Get the types of the objects in our projection.
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| getRoot | | public SelectExp getRoot()(Code) | | Get the topmost SELECT for this spec.
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| isSingleObjectRow | | public boolean isSingleObjectRow()(Code) | | |
| printPlan | | public void printPlan(PrintStream p, String indent)(Code) | | Print a user understandable description of this operation.
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| setSingleObjectRow | | public void setSingleObjectRow(boolean singleObjectRow)(Code) | | If singleObjectRow is true and the projection only has one Object
then this is returned as is and not in an Object[1].
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