org.teiid.translator.jdbc

Class SQLConversionVisitor

java.lang.Object

org.teiid.language.visitor.AbstractLanguageVisitor

org.teiid.language.visitor.SQLStringVisitor

org.teiid.translator.jdbc.SQLConversionVisitor

All Implemented Interfaces:

LanguageObjectVisitor, SQLStringVisitor.Substitutor

Direct Known Subclasses:

HiveSQLConversionVisitor, PhoenixSQLConversionVisitor, PISQLConversionVisitor, TeradataSQLConversionVisitor

public class SQLConversionVisitor
extends SQLStringVisitor
implements SQLStringVisitor.Substitutor

This visitor takes an ICommand and does DBMS-specific conversion on it to produce a SQL String. This class is expected to be subclassed.

Nested Class Summary

Nested classes/interfaces inherited from class org.teiid.language.visitor.SQLStringVisitor

SQLStringVisitor.Substitutor

Field Summary

Fields

Modifier and Type	Field and Description
static String	TEIID_NON_PREPARED

Fields inherited from class org.teiid.language.visitor.SQLStringVisitor

buffer, shortNameOnly, TEIID_NATIVE_QUERY, UNDEFINED, UNDEFINED_PARAM

Constructor Summary

Constructors

Constructor and Description
SQLConversionVisitor(JDBCExecutionFactory ef)

Method Summary

Modifier and Type	Method and Description
void	append(LanguageObject obj) Appends the string form of the LanguageObject to the current buffer.
protected void	appendBaseName(NamedTable obj)
protected void	appendLateralKeyword()
protected void	appendSetOperation(SetQuery.Operation operation)
protected String	generateSqlForStoredProcedure(Call exec) This is a generic implementation.
protected ExecutionContext	getExecutionContext() Retrieve the per-command execution context for this visitor (intended for subclasses to use).
protected String	getLikeRegexString()
protected String	getSourceComment(Command command)
boolean	isPrepared()
boolean	isUsingBinding()
protected String	removeCharacters(String value)
protected String	replaceElementName(String group, String element) Take the specified derived group and element short names and determine a replacement element name to use instead.
void	setExecutionContext(ExecutionContext context) Set the per-command execution context on this visitor.
void	setPrepared(boolean prepared)
void	substitute(Argument arg, StringBuilder builder, int index)
protected void	translateSQLType(Class<?> type, Object obj, StringBuilder valuesbuffer)
protected boolean	useAsInGroupAlias() Indicates whether group alias should be of the form "...FROM groupA AS X" or "...FROM groupA X".
protected boolean	useParensForJoins()
protected boolean	useParensForSetQueries()
protected boolean	useSelectLimit()
protected boolean	useUnicodePrefix()
void	visit(Call obj)
void	visit(Comparison obj)
void	visit(DerivedColumn obj)
void	visit(ExpressionValueSource obj)
void	visit(Function obj)
void	visit(GroupBy obj)
void	visit(In obj)
void	visit(Like obj)
void	visit(Literal obj)
void	visit(Parameter obj)
void	visit(SearchedCase obj)
void	visit(SetClause obj)

Methods inherited from class org.teiid.language.visitor.SQLStringVisitor

append, append, appendCallStart, appendLiteral, appendNestedCondition, appendQuantifier, appendRightComparison, appendSetQuery, appendWithKeyword, escapeString, getInsertKeyword, getName, getRecordName, getShortName, getSQLString, getUpsertKeyword, isInfixFunction, parseNativeQueryParts, shouldNestSetChild, toString, useParensForLHSJoins, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class org.teiid.language.visitor.AbstractLanguageVisitor

visit, visitNode, visitNodes, visitNodes

Methods inherited from class java.lang.Object

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

Field Detail

TEIID_NON_PREPARED

public static final String TEIID_NON_PREPARED

See Also:

Constant Field Values

Constructor Detail

SQLConversionVisitor

public SQLConversionVisitor(JDBCExecutionFactory ef)

Method Detail

append

public void append(LanguageObject obj)

Description copied from class: SQLStringVisitor

Appends the string form of the LanguageObject to the current buffer.

Overrides:

append in class SQLStringVisitor

Parameters:

obj - the language object instance

translateSQLType

protected void translateSQLType(Class<?> type,
                                Object obj,
                                StringBuilder valuesbuffer)

Parameters:

type -

object -

valuesbuffer -

removeCharacters

protected String removeCharacters(String value)

useUnicodePrefix

protected boolean useUnicodePrefix()

visit

public void visit(Call obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

See Also:

SQLStringVisitor.visit(org.teiid.language.Call)

visit

public void visit(Function obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(Parameter obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(Literal obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

See Also:

SQLStringVisitor.visit(org.teiid.language.Literal)

visit

public void visit(In obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(Like obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(Comparison obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(ExpressionValueSource obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(SetClause obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(DerivedColumn obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

visit

public void visit(SearchedCase obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

setExecutionContext

public void setExecutionContext(ExecutionContext context)

Set the per-command execution context on this visitor.

Parameters:

context - ExecutionContext

Since:

4.3

getExecutionContext

protected ExecutionContext getExecutionContext()

Retrieve the per-command execution context for this visitor (intended for subclasses to use).

Returns:

Since:

4.3

getSourceComment

protected String getSourceComment(Command command)

Overrides:

getSourceComment in class SQLStringVisitor

generateSqlForStoredProcedure

protected String generateSqlForStoredProcedure(Call exec)

This is a generic implementation. Subclass should override this method if necessary.

Parameters:

exec - The command for the stored procedure.

Returns:

String to be executed by CallableStatement.

isPrepared

public boolean isPrepared()

setPrepared

public void setPrepared(boolean prepared)

isUsingBinding

public boolean isUsingBinding()

useAsInGroupAlias

protected boolean useAsInGroupAlias()

Description copied from class: SQLStringVisitor

Indicates whether group alias should be of the form "...FROM groupA AS X" or "...FROM groupA X". Certain data sources (such as Oracle) may not support the first form.

Overrides:

useAsInGroupAlias in class SQLStringVisitor

Returns:

boolean

useParensForSetQueries

protected boolean useParensForSetQueries()

Overrides:

useParensForSetQueries in class SQLStringVisitor

replaceElementName

protected String replaceElementName(String group,
                                    String element)

Description copied from class: SQLStringVisitor

Take the specified derived group and element short names and determine a replacement element name to use instead. Most commonly, this is used to strip the group name if the group is a pseudo-group (DUAL) or the element is a pseudo-group (ROWNUM). It may also be used to strip special information out of the name in source value in some specialized cases. By default, this method returns null, indicating that the normal group and element name logic should be used (group + "." + element). Subclasses should override and implement this method if desired.

Overrides:

replaceElementName in class SQLStringVisitor

Parameters:

group - Group name, may be null

element - Element name, never null

Returns:

Replacement element name to be used as is (no modification will occur)

appendSetOperation

protected void appendSetOperation(SetQuery.Operation operation)

Overrides:

appendSetOperation in class SQLStringVisitor

useParensForJoins

protected boolean useParensForJoins()

Overrides:

useParensForJoins in class SQLStringVisitor

useSelectLimit

protected boolean useSelectLimit()

Overrides:

useSelectLimit in class SQLStringVisitor

getLikeRegexString

protected String getLikeRegexString()

Overrides:

getLikeRegexString in class SQLStringVisitor

appendBaseName

protected void appendBaseName(NamedTable obj)

Overrides:

appendBaseName in class SQLStringVisitor

substitute

public void substitute(Argument arg,
                       StringBuilder builder,
                       int index)

Specified by:

substitute in interface SQLStringVisitor.Substitutor

visit

public void visit(GroupBy obj)

Specified by:

visit in interface LanguageObjectVisitor

Overrides:

visit in class SQLStringVisitor

appendLateralKeyword

protected void appendLateralKeyword()

Overrides:

appendLateralKeyword in class SQLStringVisitor