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oracle.javatools.db.sql
Class SQLFragmentUtils

java.lang.Object
oracle.javatools.db.sql.SQLFragmentUtils

public final class SQLFragmentUtils

extends java.lang.Object

Utilities for dealing with SQLFragments.

Method Summary

static java.util.List<SelectObject>	expandStarColumns(SQLQuery query) Gets an expanded list of SelectObjects for the given query that has any wildcard * columns expanded to the underlying table columns.
static SelectObject[]	getSelectObjects(SQLQuery query) Gets the SelectObjects for this query.
static Relation	getTable(FromObject from)
static java.lang.String	getTableName(FromObjectUsage usage) Gets the table name used by the given FromObjectUsage (could be an alias rather than an actual table's name).
static boolean	hasPKCols(java.util.Collection<java.lang.String> colNames, FromObject from) Tests whether the list of columns contains a PK column for the table referenced by the given given FromObject
static java.util.Collection<java.lang.String>	listColumnNames(SQLFragment expression) Lists the columns available from the given SQLFragment.
static java.util.Collection<Column>	listColumns(SQLFragment expression) Lists the columns available from the given SQLFragment.
static java.util.Collection<ColumnUsage>	listColumnUsages(SQLFragment expression) Lists the columns available from the given SQLFragment.
static java.util.Collection<java.lang.String>	listCommonColumns(FromObject left, FromObject right) Lists the names of columns common to both FromObjects.
static java.util.Collection<java.lang.String>	listCommonColumns(JoinObject join) List the names of columns common to both the left and right side of the given join.
static java.util.Set<java.lang.String>	listFromObjectNames(SQLQuery query) Lists the names of the FromObjects that are defined in the given query (does not include subqueries, just the namespace available in the current query).
static void	replaceStarColumns(SQLQuery query) Alters the given SQLQuery so that any asterisk columns are expanded into multiple select objects.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

getSelectObjects

public static SelectObject[] getSelectObjects(SQLQuery query)

Gets the SelectObjects for this query. If the query contains a set operator (or operators) the SelectObjects of the first "real" query are returned so that the list is meaningful.

It is only expected that this is useful for logic that determines the "columns" to match a given query.

Parameters:

query - the query to get a list of SelectObjects for

Returns:

the SelectObjects of the query, or the SelectObjects of the first part of a union (or similar) query.

replaceStarColumns

public static void replaceStarColumns(SQLQuery query)

Alters the given SQLQuery so that any asterisk columns are expanded into multiple select objects. For example "SELECT * FROM TABLE1" is changed to become "SELECT COL1, COL2... FROM TABLE1" where COL1, COL2... are the columns available on TABLE1.

Parameters:

query - the query to expand.

expandStarColumns

public static java.util.List<SelectObject> expandStarColumns(SQLQuery query)

Gets an expanded list of SelectObjects for the given query that has any wildcard * columns expanded to the underlying table columns.

getTable

public static Relation getTable(FromObject from)

getTableName

public static java.lang.String getTableName(FromObjectUsage usage)

Gets the table name used by the given FromObjectUsage (could be an alias rather than an actual table's name).

Parameters:

usage - the FromObjectUsage to get the table name/alias for

Returns:

the table's name/alias or null if none could be determined

listFromObjectNames

public static java.util.Set<java.lang.String> listFromObjectNames(SQLQuery query)

Lists the names of the FromObjects that are defined in the given query (does not include subqueries, just the namespace available in the current query).

listCommonColumns

public static java.util.Collection<java.lang.String> listCommonColumns(JoinObject join)

List the names of columns common to both the left and right side of the given join.

listCommonColumns

public static java.util.Collection<java.lang.String> listCommonColumns(FromObject left,
                                                                       FromObject right)

Lists the names of columns common to both FromObjects.

listColumns

public static java.util.Collection<Column> listColumns(SQLFragment expression)

Lists the columns available from the given SQLFragment. The fragment must be a FromObject, JoinObject or RelationUsage.

Parameters:

expression - the expression to query

Returns:

valid Columns that could be associated with the given expression

listColumnUsages

public static java.util.Collection<ColumnUsage> listColumnUsages(SQLFragment expression)

Lists the columns available from the given SQLFragment. The fragment must be a FromObject, JoinObject or RelationUsage.

Parameters:

expression - the expression to query

Returns:

valid ColumnUsages that could be associated with the given expression

listColumnNames

public static java.util.Collection<java.lang.String> listColumnNames(SQLFragment expression)

Lists the columns available from the given SQLFragment. The fragment must be a FromObject, JoinObject or RelationUsage.

Parameters:

expression - the expression to query

Returns:

valid Column names that could be associated with the given expression

hasPKCols

public static boolean hasPKCols(java.util.Collection<java.lang.String> colNames,
                                FromObject from)

Tests whether the list of columns contains a PK column for the table referenced by the given given FromObject

Parameters:

colNames - the name of the columns from the used table

from - the FromObject (from which the table is found)

Returns:

true if the colNames contains a PK column

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