Package com.blazebit.persistence.impl.util

Class SqlUtils

java.lang.Object

com.blazebit.persistence.impl.util.SqlUtils

public class SqlUtils
extends Object

Utility class to extract information from SQL queries.

Since:

1.2.0

Author:

Christian Beikov

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static interface	SqlUtils.SelectItemExtractor

Field Summary

Fields

Modifier and Type	Field	Description
static final String	AS
static final PatternFinder	AS_FINDER
static final String	FETCH_FIRST
static final PatternFinder	FETCH_FIRST_FINDER
static final String	FROM
static final String	FROM_FINAL_TABLE
static final PatternFinder	FROM_FINAL_TABLE_FINDER
static final PatternFinder	FROM_FINDER
static final String	GROUP_BY
static final PatternFinder	GROUP_BY_FINDER
static final String	HAVING
static final PatternFinder	HAVING_FINDER
static final String	JOIN
static final PatternFinder	JOIN_FINDER
static final String	LIMIT
static final PatternFinder	LIMIT_FINDER
static final String	NEXT_VALUE_FOR
static final PatternFinder	NEXT_VALUE_FOR_FINDER
static final String	ON
static final PatternFinder	ON_FINDER
static final String	ORDER_BY
static final PatternFinder	ORDER_BY_FINDER
static final String	SELECT
static final PatternFinder	SELECT_FINDER
static final String	SET
static final PatternFinder	SET_FINDER
static final String	WHERE
static final PatternFinder	WHERE_FINDER
static final String	WITH
static final PatternFinder	WITH_FINDER

Method Summary

Modifier and Type	Method	Description
static void	applyTableNameRemapping(StringBuilder sb, ExtendedQuerySupport.SqlFromInfo sqlFromInfo, String newCteName, String aliasExtension, String newSqlAlias, boolean useApply)
static void	applyTableNameRemapping(StringBuilder sb, String sqlAlias, String newCteName, String aliasExtension, String newSqlAlias, boolean useApply)
static void	buildAliasMappingForTopLevelSelects(CharSequence sql, String alias, Map<String,String> aliasMapping)
static String	extractAlias(CharSequence sb, int index)	Extracts the next alias from the given expression starting the given index.
static String	extractAlias(StringBuilder sb)	Extracts the alias part of a select item expression.
static int	findEndOfOnClause(CharSequence sqlSb, int predicateStartIndex, int whereIndex)
static int	findJoinStartIndex(CharSequence sqlSb, int aliasIndex)
static int	findJoinStartIndex(CharSequence sqlSb, int tokenEnd, Set<com.blazebit.persistence.impl.util.SqlUtils.JoinToken> allowedTokens)
static List<String>	getExpressionItems(CharSequence sql)
static List<String>	getExpressionItems(CharSequence sql, int i, int end)
static List<String>	getExpressionItems(CharSequence sql, int i, int end, SqlUtils.SelectItemExtractor extractor)
static String[]	getSelectItemAliases(CharSequence sql, int start)	Extracts the select item aliases of an arbitrary SELECT query.
static String[]	getSelectItemColumns(CharSequence sql, int start)
static String[]	getSelectItemExpressions(CharSequence sql, int start)
static String[]	getSelectItems(CharSequence sql, int start, SqlUtils.SelectItemExtractor extractor)
static int	indexOfFetchFirst(CharSequence sql, int start)
static int[]	indexOfFinalTableSubquery(CharSequence sql, int selectIndex)	Finds the final table clause in an arbitrary SELECT query.
static int	indexOfFrom(CharSequence sql)
static int	indexOfFrom(CharSequence sql, int start)
static int[]	indexOfFullJoin(CharSequence sql, String tableAlias)
static int[]	indexOfFullJoin(CharSequence sql, String tableAlias, int whereIndex)
static int[]	indexOfFullJoin(CharSequence sql, String tableAlias, int aliasIndex, int whereIndex)
static int	indexOfGroupBy(CharSequence sql, int start)
static int	indexOfHaving(CharSequence sql, int start)
static int	indexOfJoinTableAlias(CharSequence sql, String tableAlias)
static int	indexOfLimit(CharSequence sql)	Finds the toplevel LIMIT keyword in an arbitrary query.
static int	indexOfLimit(CharSequence sql, int start)
static int	indexOfOn(CharSequence sql, int start)
static int	indexOfOrderBy(CharSequence sql)	Finds the toplevel ORDER BY keyword in an arbitrary query.
static int	indexOfOrderBy(CharSequence sql, int start)
static int	indexOfSelect(CharSequence sql)	Finds the toplevel SELECT keyword in an arbitrary SELECT query.
static int	indexOfSet(CharSequence sql)
static int	indexOfTableName(CharSequence sql, String tableName)	Finds the table name within a FROM clause of an arbitrary SELECT query.
static int	indexOfWhere(CharSequence sql)	Finds the toplevel WHERE keyword in an arbitrary query.
static int	indexOfWhere(CharSequence sql, int start)
static boolean	isIdentifier(char c)
static boolean	isIdentifierStart(char c)
static void	remapColumnExpressions(StringBuilder sqlSb, Map<String,String> columnExpressionRemappings)
static int	remapColumnExpressions(StringBuilder sqlSb, Map<String,String> columnExpressionRemappings, int startIndex, int endIndex)
static int[]	rtrimBackwardsToFirstWhitespace(CharSequence sb, int startIndex)

Methods inherited from class java.lang.Object

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

Field Details

SELECT

public static final String SELECT

See Also:

• Constant Field Values

SET

public static final String SET

See Also:

• Constant Field Values

FROM

public static final String FROM

See Also:

• Constant Field Values

JOIN

public static final String JOIN

See Also:

• Constant Field Values

ON

public static final String ON

See Also:

• Constant Field Values

WITH

public static final String WITH

See Also:

• Constant Field Values

WHERE

public static final String WHERE

See Also:

• Constant Field Values

GROUP_BY

public static final String GROUP_BY

See Also:

• Constant Field Values

HAVING

public static final String HAVING

See Also:

• Constant Field Values

ORDER_BY

public static final String ORDER_BY

See Also:

• Constant Field Values

LIMIT

public static final String LIMIT

See Also:

• Constant Field Values

FETCH_FIRST

public static final String FETCH_FIRST

See Also:

• Constant Field Values

AS

public static final String AS

See Also:

• Constant Field Values

FROM_FINAL_TABLE

public static final String FROM_FINAL_TABLE

See Also:

• Constant Field Values

NEXT_VALUE_FOR

public static final String NEXT_VALUE_FOR

See Also:

• Constant Field Values

SELECT_FINDER

public static final PatternFinder SELECT_FINDER

SET_FINDER

public static final PatternFinder SET_FINDER

FROM_FINDER

public static final PatternFinder FROM_FINDER

JOIN_FINDER

public static final PatternFinder JOIN_FINDER

ON_FINDER

public static final PatternFinder ON_FINDER

WITH_FINDER

public static final PatternFinder WITH_FINDER

WHERE_FINDER

public static final PatternFinder WHERE_FINDER

GROUP_BY_FINDER

public static final PatternFinder GROUP_BY_FINDER

HAVING_FINDER

public static final PatternFinder HAVING_FINDER

ORDER_BY_FINDER

public static final PatternFinder ORDER_BY_FINDER

LIMIT_FINDER

public static final PatternFinder LIMIT_FINDER

FETCH_FIRST_FINDER

public static final PatternFinder FETCH_FIRST_FINDER

AS_FINDER

public static final PatternFinder AS_FINDER

FROM_FINAL_TABLE_FINDER

public static final PatternFinder FROM_FINAL_TABLE_FINDER

NEXT_VALUE_FOR_FINDER

public static final PatternFinder NEXT_VALUE_FOR_FINDER

Method Details

applyTableNameRemapping

public static void applyTableNameRemapping(StringBuilder sb,
 ExtendedQuerySupport.SqlFromInfo sqlFromInfo,
 String newCteName,
 String aliasExtension,
 String newSqlAlias,
 boolean useApply)

applyTableNameRemapping

public static void applyTableNameRemapping(StringBuilder sb,
 String sqlAlias,
 String newCteName,
 String aliasExtension,
 String newSqlAlias,
 boolean useApply)

remapColumnExpressions

public static void remapColumnExpressions(StringBuilder sqlSb,
 Map<String,String> columnExpressionRemappings)

remapColumnExpressions

public static int remapColumnExpressions(StringBuilder sqlSb,
 Map<String,String> columnExpressionRemappings,
 int startIndex,
 int endIndex)

rtrimBackwardsToFirstWhitespace

public static int[] rtrimBackwardsToFirstWhitespace(CharSequence sb,
 int startIndex)

isIdentifierStart

public static boolean isIdentifierStart(char c)

isIdentifier

public static boolean isIdentifier(char c)

getSelectItemAliases

public static String[] getSelectItemAliases(CharSequence sql,
 int start)

Extracts the select item aliases of an arbitrary SELECT query.

Parameters:

sql - The SQL query

start - The start index from which to look for select items

Returns:

The select item aliases

getSelectItemExpressions

public static String[] getSelectItemExpressions(CharSequence sql,
 int start)

getSelectItemColumns

public static String[] getSelectItemColumns(CharSequence sql,
 int start)

getSelectItems

public static String[] getSelectItems(CharSequence sql,
 int start,
 SqlUtils.SelectItemExtractor extractor)

getExpressionItems

public static List<String> getExpressionItems(CharSequence sql)

getExpressionItems

public static List<String> getExpressionItems(CharSequence sql,
 int i,
 int end)

getExpressionItems

public static List<String> getExpressionItems(CharSequence sql,
 int i,
 int end,
 SqlUtils.SelectItemExtractor extractor)

buildAliasMappingForTopLevelSelects

public static void buildAliasMappingForTopLevelSelects(CharSequence sql,
 String alias,
 Map<String,String> aliasMapping)

indexOfSelect

public static int indexOfSelect(CharSequence sql)

Finds the toplevel SELECT keyword in an arbitrary SELECT query.

Parameters:

sql - The SQL query

Returns:

The index of the SELECT keyword if found, or -1

indexOfSet

public static int indexOfSet(CharSequence sql)

indexOfFrom

public static int indexOfFrom(CharSequence sql)

indexOfFrom

public static int indexOfFrom(CharSequence sql,
 int start)

indexOfWhere

public static int indexOfWhere(CharSequence sql)

Finds the toplevel WHERE keyword in an arbitrary query.

Parameters:

sql - The SQL query

Returns:

The index of the SELECT keyword if found, or -1

indexOfWhere

public static int indexOfWhere(CharSequence sql,
 int start)

indexOfGroupBy

public static int indexOfGroupBy(CharSequence sql,
 int start)

indexOfHaving

public static int indexOfHaving(CharSequence sql,
 int start)

indexOfOrderBy

public static int indexOfOrderBy(CharSequence sql)

Finds the toplevel ORDER BY keyword in an arbitrary query.

Parameters:

sql - The SQL query

Returns:

The index of the ORDER BY keyword if found, or -1

indexOfOrderBy

public static int indexOfOrderBy(CharSequence sql,
 int start)

indexOfLimit

public static int indexOfLimit(CharSequence sql)

Finds the toplevel LIMIT keyword in an arbitrary query.

Parameters:

sql - The SQL query

Returns:

The index of the LIMIT keyword if found, or -1

indexOfLimit

public static int indexOfLimit(CharSequence sql,
 int start)

indexOfFetchFirst

public static int indexOfFetchFirst(CharSequence sql,
 int start)

indexOfOn

public static int indexOfOn(CharSequence sql,
 int start)

indexOfFinalTableSubquery

public static int[] indexOfFinalTableSubquery(CharSequence sql,
 int selectIndex)

Finds the final table clause in an arbitrary SELECT query.

Parameters:

sql - The SQL query

selectIndex - The start index or the index of the toplevel SELECT keyword in the query

Returns:

The start and end index of the final table subquery if found, or 0 and the length of the query

indexOfTableName

public static int indexOfTableName(CharSequence sql,
 String tableName)

Finds the table name within a FROM clause of an arbitrary SELECT query.

Parameters:

sql - The SQL query

tableName - The table name to look for

Returns:

The index of the table name or -1 if it couldn't be found

indexOfJoinTableAlias

public static int indexOfJoinTableAlias(CharSequence sql,
 String tableAlias)

indexOfFullJoin

public static int[] indexOfFullJoin(CharSequence sql,
 String tableAlias)

indexOfFullJoin

public static int[] indexOfFullJoin(CharSequence sql,
 String tableAlias,
 int whereIndex)

indexOfFullJoin

public static int[] indexOfFullJoin(CharSequence sql,
 String tableAlias,
 int aliasIndex,
 int whereIndex)

findJoinStartIndex

public static int findJoinStartIndex(CharSequence sqlSb,
 int aliasIndex)

findJoinStartIndex

public static int findJoinStartIndex(CharSequence sqlSb,
 int tokenEnd,
 Set<com.blazebit.persistence.impl.util.SqlUtils.JoinToken> allowedTokens)

findEndOfOnClause

public static int findEndOfOnClause(CharSequence sqlSb,
 int predicateStartIndex,
 int whereIndex)

extractAlias

public static String extractAlias(StringBuilder sb)

Extracts the alias part of a select item expression.

Parameters:

sb - The string builder containing the select item expression

Returns:

The alias of the select item expression

extractAlias

public static String extractAlias(CharSequence sb,
 int index)

Extracts the next alias from the given expression starting the given index.

Parameters:

sb - The char sequence containing the alias

index - The start index

Returns:

The next alias of the char sequence