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SybaseLegacySqlAstTranslator.java
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SybaseLegacySqlAstTranslator.java
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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* License: GNU Lesser General Public License (LGPL), version 2.1 or later
* See the lgpl.txt file in the root directory or http://www.gnu.org/licenses/lgpl-2.1.html
*/
package org.hibernate.community.dialect;
import java.util.List;
import java.util.function.Consumer;
import org.hibernate.LockMode;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.util.collections.Stack;
import org.hibernate.query.IllegalQueryOperationException;
import org.hibernate.query.sqm.ComparisonOperator;
import org.hibernate.sql.ast.Clause;
import org.hibernate.sql.ast.SqlAstNodeRenderingMode;
import org.hibernate.sql.ast.spi.AbstractSqlAstTranslator;
import org.hibernate.sql.ast.spi.SqlSelection;
import org.hibernate.sql.ast.tree.Statement;
import org.hibernate.sql.ast.tree.cte.CteStatement;
import org.hibernate.sql.ast.tree.delete.DeleteStatement;
import org.hibernate.sql.ast.tree.expression.BinaryArithmeticExpression;
import org.hibernate.sql.ast.tree.expression.CaseSearchedExpression;
import org.hibernate.sql.ast.tree.expression.CaseSimpleExpression;
import org.hibernate.sql.ast.tree.expression.Expression;
import org.hibernate.sql.ast.tree.expression.Literal;
import org.hibernate.sql.ast.tree.expression.SqlTuple;
import org.hibernate.sql.ast.tree.expression.Summarization;
import org.hibernate.sql.ast.tree.from.NamedTableReference;
import org.hibernate.sql.ast.tree.from.UnionTableReference;
import org.hibernate.sql.ast.tree.from.ValuesTableReference;
import org.hibernate.sql.ast.tree.insert.ConflictClause;
import org.hibernate.sql.ast.tree.insert.InsertSelectStatement;
import org.hibernate.sql.ast.tree.insert.Values;
import org.hibernate.sql.ast.tree.select.QueryPart;
import org.hibernate.sql.ast.tree.select.QuerySpec;
import org.hibernate.sql.ast.tree.update.UpdateStatement;
import org.hibernate.sql.exec.spi.JdbcOperation;
/**
* A SQL AST translator for Sybase.
*
* @author Christian Beikov
*/
public class SybaseLegacySqlAstTranslator<T extends JdbcOperation> extends AbstractSqlAstTranslator<T> {
private static final String UNION_ALL = " union all ";
public SybaseLegacySqlAstTranslator(SessionFactoryImplementor sessionFactory, Statement statement) {
super( sessionFactory, statement );
}
@Override
protected void visitInsertStatementOnly(InsertSelectStatement statement) {
if ( statement.getConflictClause() == null || statement.getConflictClause().isDoNothing() ) {
// Render plain insert statement and possibly run into unique constraint violation
super.visitInsertStatementOnly( statement );
}
else {
visitInsertStatementEmulateMerge( statement );
appendSql( ';' );
}
}
@Override
protected void renderDeleteClause(DeleteStatement statement) {
appendSql( "delete " );
final Stack<Clause> clauseStack = getClauseStack();
try {
clauseStack.push( Clause.DELETE );
renderDmlTargetTableExpression( statement.getTargetTable() );
}
finally {
clauseStack.pop();
}
visitFromClause( statement.getFromClause() );
}
@Override
protected void renderFromClauseAfterUpdateSet(UpdateStatement statement) {
visitFromClause( statement.getFromClause() );
}
@Override
protected void visitConflictClause(ConflictClause conflictClause) {
if ( conflictClause != null ) {
if ( conflictClause.isDoUpdate() && conflictClause.getConstraintName() != null ) {
throw new IllegalQueryOperationException( "Insert conflict 'do update' clause with constraint name is not supported" );
}
}
}
@Override
protected boolean supportsWithClause() {
return false;
}
// Sybase does not allow CASE expressions where all result arms contain plain parameters.
// At least one result arm must provide some type context for inference,
// so we cast the first result arm if we encounter this condition
@Override
protected void visitAnsiCaseSearchedExpression(
CaseSearchedExpression caseSearchedExpression,
Consumer<Expression> resultRenderer) {
if ( getParameterRenderingMode() == SqlAstNodeRenderingMode.DEFAULT && areAllResultsParameters( caseSearchedExpression ) ) {
final List<CaseSearchedExpression.WhenFragment> whenFragments = caseSearchedExpression.getWhenFragments();
final Expression firstResult = whenFragments.get( 0 ).getResult();
super.visitAnsiCaseSearchedExpression(
caseSearchedExpression,
e -> {
if ( e == firstResult ) {
renderCasted( e );
}
else {
resultRenderer.accept( e );
}
}
);
}
else {
super.visitAnsiCaseSearchedExpression( caseSearchedExpression, resultRenderer );
}
}
@Override
protected void visitAnsiCaseSimpleExpression(
CaseSimpleExpression caseSimpleExpression,
Consumer<Expression> resultRenderer) {
if ( getParameterRenderingMode() == SqlAstNodeRenderingMode.DEFAULT && areAllResultsParameters( caseSimpleExpression ) ) {
final List<CaseSimpleExpression.WhenFragment> whenFragments = caseSimpleExpression.getWhenFragments();
final Expression firstResult = whenFragments.get( 0 ).getResult();
super.visitAnsiCaseSimpleExpression(
caseSimpleExpression,
e -> {
if ( e == firstResult ) {
renderCasted( e );
}
else {
resultRenderer.accept( e );
}
}
);
}
else {
super.visitAnsiCaseSimpleExpression( caseSimpleExpression, resultRenderer );
}
}
@Override
protected boolean renderNamedTableReference(NamedTableReference tableReference, LockMode lockMode) {
final String tableExpression = tableReference.getTableExpression();
if ( tableReference instanceof UnionTableReference && lockMode != LockMode.NONE && tableExpression.charAt( 0 ) == '(' ) {
// SQL Server requires to push down the lock hint to the actual table names
int searchIndex = 0;
int unionIndex;
while ( ( unionIndex = tableExpression.indexOf( UNION_ALL, searchIndex ) ) != -1 ) {
append( tableExpression, searchIndex, unionIndex );
renderLockHint( lockMode );
appendSql( UNION_ALL );
searchIndex = unionIndex + UNION_ALL.length();
}
append( tableExpression, searchIndex, tableExpression.length() - 1 );
renderLockHint( lockMode );
appendSql( " )" );
registerAffectedTable( tableReference );
renderTableReferenceIdentificationVariable( tableReference );
}
else {
super.renderNamedTableReference( tableReference, lockMode );
renderLockHint( lockMode );
}
// Just always return true because SQL Server doesn't support the FOR UPDATE clause
return true;
}
private void renderLockHint(LockMode lockMode) {
if ( LockMode.READ.lessThan( lockMode ) ) {
appendSql( " holdlock" );
}
}
@Override
protected void renderForUpdateClause(QuerySpec querySpec, ForUpdateClause forUpdateClause) {
// Sybase does not support the FOR UPDATE clause
}
@Override
protected void visitValuesList(List<Values> valuesList) {
visitValuesListEmulateSelectUnion( valuesList );
}
@Override
public void visitValuesTableReference(ValuesTableReference tableReference) {
append( '(' );
visitValuesListEmulateSelectUnion( tableReference.getValuesList() );
append( ')' );
renderDerivedTableReference( tableReference );
}
@Override
public void visitOffsetFetchClause(QueryPart queryPart) {
assertRowsOnlyFetchClauseType( queryPart );
if ( !queryPart.isRoot() && queryPart.getOffsetClauseExpression() != null ) {
throw new IllegalArgumentException( "Can't emulate offset clause in subquery" );
}
}
@Override
protected void renderComparison(Expression lhs, ComparisonOperator operator, Expression rhs) {
renderComparisonEmulateIntersect( lhs, operator, rhs );
}
@Override
protected void renderSelectTupleComparison(
List<SqlSelection> lhsExpressions,
SqlTuple tuple,
ComparisonOperator operator) {
emulateSelectTupleComparison( lhsExpressions, tuple.getExpressions(), operator, true );
}
@Override
protected void renderPartitionItem(Expression expression) {
if ( expression instanceof Literal ) {
// Note that this depends on the SqmToSqlAstConverter to add a dummy table group
appendSql( "dummy_.x" );
}
else if ( expression instanceof Summarization ) {
// This could theoretically be emulated by rendering all grouping variations of the query and
// connect them via union all but that's probably pretty inefficient and would have to happen
// on the query spec level
throw new UnsupportedOperationException( "Summarization is not supported by DBMS" );
}
else {
expression.accept( this );
}
}
@Override
public void visitBinaryArithmeticExpression(BinaryArithmeticExpression arithmeticExpression) {
appendSql( OPEN_PARENTHESIS );
visitArithmeticOperand( arithmeticExpression.getLeftHandOperand() );
appendSql( arithmeticExpression.getOperator().getOperatorSqlTextString() );
visitArithmeticOperand( arithmeticExpression.getRightHandOperand() );
appendSql( CLOSE_PARENTHESIS );
}
@Override
protected boolean supportsRowValueConstructorSyntax() {
return false;
}
@Override
protected boolean supportsRowValueConstructorSyntaxInInList() {
return false;
}
@Override
protected boolean supportsRowValueConstructorSyntaxInQuantifiedPredicates() {
return false;
}
@Override
protected boolean needsRowsToSkip() {
return true;
}
@Override
protected boolean needsMaxRows() {
return true;
}
}