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MariaDBSqlAstTranslator.java
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MariaDBSqlAstTranslator.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.dialect;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.internal.util.collections.Stack;
import org.hibernate.query.sqm.ComparisonOperator;
import org.hibernate.sql.ast.Clause;
import org.hibernate.sql.ast.spi.AbstractSqlAstTranslator;
import org.hibernate.sql.ast.tree.MutationStatement;
import org.hibernate.sql.ast.tree.Statement;
import org.hibernate.sql.ast.tree.delete.DeleteStatement;
import org.hibernate.sql.ast.tree.expression.BinaryArithmeticExpression;
import org.hibernate.sql.ast.tree.expression.CastTarget;
import org.hibernate.sql.ast.tree.expression.ColumnReference;
import org.hibernate.sql.ast.tree.expression.Expression;
import org.hibernate.sql.ast.tree.expression.Literal;
import org.hibernate.sql.ast.tree.expression.Summarization;
import org.hibernate.sql.ast.tree.from.NamedTableReference;
import org.hibernate.sql.ast.tree.from.QueryPartTableReference;
import org.hibernate.sql.ast.tree.insert.ConflictClause;
import org.hibernate.sql.ast.tree.insert.InsertSelectStatement;
import org.hibernate.sql.ast.tree.predicate.BooleanExpressionPredicate;
import org.hibernate.sql.ast.tree.predicate.LikePredicate;
import org.hibernate.sql.ast.tree.select.QueryGroup;
import org.hibernate.sql.ast.tree.select.QueryPart;
import org.hibernate.sql.ast.tree.select.QuerySpec;
import org.hibernate.sql.ast.tree.select.SelectStatement;
import org.hibernate.sql.ast.tree.update.UpdateStatement;
import org.hibernate.sql.exec.internal.JdbcOperationQueryInsertImpl;
import org.hibernate.sql.exec.spi.JdbcOperation;
import org.hibernate.sql.exec.spi.JdbcOperationQueryInsert;
/**
* A SQL AST translator for MariaDB.
*
* @author Christian Beikov
*/
public class MariaDBSqlAstTranslator<T extends JdbcOperation> extends AbstractSqlAstTranslator<T> {
private final MariaDBDialect dialect;
public MariaDBSqlAstTranslator(SessionFactoryImplementor sessionFactory, Statement statement) {
super( sessionFactory, statement );
this.dialect = (MariaDBDialect) DialectDelegateWrapper.extractRealDialect( super.getDialect() );
}
@Override
public void visitBinaryArithmeticExpression(BinaryArithmeticExpression arithmeticExpression) {
if ( isIntegerDivisionEmulationRequired( arithmeticExpression ) ) {
appendSql( OPEN_PARENTHESIS );
visitArithmeticOperand( arithmeticExpression.getLeftHandOperand() );
appendSql( " div " );
visitArithmeticOperand( arithmeticExpression.getRightHandOperand() );
appendSql( CLOSE_PARENTHESIS );
}
else {
super.visitBinaryArithmeticExpression(arithmeticExpression);
}
}
@Override
protected void visitInsertSource(InsertSelectStatement statement) {
if ( statement.getSourceSelectStatement() != null ) {
if ( statement.getConflictClause() != null ) {
final List<ColumnReference> targetColumnReferences = statement.getTargetColumns();
final List<String> columnNames = new ArrayList<>( targetColumnReferences.size() );
for ( ColumnReference targetColumnReference : targetColumnReferences ) {
columnNames.add( targetColumnReference.getColumnExpression() );
}
appendSql( "select * from " );
emulateQueryPartTableReferenceColumnAliasing(
new QueryPartTableReference(
new SelectStatement( statement.getSourceSelectStatement() ),
"excluded",
columnNames,
false,
getSessionFactory()
)
);
}
else {
statement.getSourceSelectStatement().accept( this );
}
}
else {
visitValuesList( statement.getValuesList() );
}
}
@Override
public void visitColumnReference(ColumnReference columnReference) {
final Statement currentStatement;
if ( "excluded".equals( columnReference.getQualifier() )
&& ( currentStatement = getStatementStack().getCurrent() ) instanceof InsertSelectStatement
&& ( (InsertSelectStatement) currentStatement ).getSourceSelectStatement() == null ) {
// Accessing the excluded row for an insert-values statement in the conflict clause requires the values qualifier
appendSql( "values(" );
columnReference.appendReadExpression( this, null );
append( ')' );
}
else {
super.visitColumnReference( columnReference );
}
}
@Override
protected void renderDeleteClause(DeleteStatement statement) {
appendSql( "delete" );
final Stack<Clause> clauseStack = getClauseStack();
try {
clauseStack.push( Clause.DELETE );
renderTableReferenceIdentificationVariable( statement.getTargetTable() );
if ( statement.getFromClause().getRoots().isEmpty() ) {
appendSql( " from " );
renderDmlTargetTableExpression( statement.getTargetTable() );
}
else {
visitFromClause( statement.getFromClause() );
}
}
finally {
clauseStack.pop();
}
}
@Override
protected void renderUpdateClause(UpdateStatement updateStatement) {
if ( updateStatement.getFromClause().getRoots().isEmpty() ) {
super.renderUpdateClause( updateStatement );
}
else {
appendSql( "update " );
renderFromClauseSpaces( updateStatement.getFromClause() );
}
}
@Override
protected void renderDmlTargetTableExpression(NamedTableReference tableReference) {
super.renderDmlTargetTableExpression( tableReference );
if ( getClauseStack().getCurrent() != Clause.INSERT ) {
renderTableReferenceIdentificationVariable( tableReference );
}
}
@Override
protected boolean supportsJoinsInDelete() {
return true;
}
@Override
protected JdbcOperationQueryInsert translateInsert(InsertSelectStatement sqlAst) {
visitInsertStatement( sqlAst );
return new JdbcOperationQueryInsertImpl(
getSql(),
getParameterBinders(),
getAffectedTableNames(),
getUniqueConstraintNameThatMayFail(sqlAst)
);
}
@Override
protected void visitConflictClause(ConflictClause conflictClause) {
visitOnDuplicateKeyConflictClause( conflictClause );
}
@Override
protected String determineColumnReferenceQualifier(ColumnReference columnReference) {
final DmlTargetColumnQualifierSupport qualifierSupport = getDialect().getDmlTargetColumnQualifierSupport();
final MutationStatement currentDmlStatement;
final String dmlAlias;
// Since MariaDB does not support aliasing the insert target table,
// we must detect column reference that are used in the conflict clause
// and use the table expression as qualifier instead
if ( getClauseStack().getCurrent() != Clause.SET
|| !( ( currentDmlStatement = getCurrentDmlStatement() ) instanceof InsertSelectStatement )
|| ( dmlAlias = currentDmlStatement.getTargetTable().getIdentificationVariable() ) == null
|| !dmlAlias.equals( columnReference.getQualifier() ) ) {
return columnReference.getQualifier();
}
// Qualify the column reference with the table expression also when in subqueries
else if ( qualifierSupport != DmlTargetColumnQualifierSupport.NONE || !getQueryPartStack().isEmpty() ) {
return getCurrentDmlStatement().getTargetTable().getTableExpression();
}
else {
return null;
}
}
@Override
protected boolean supportsWithClauseInSubquery() {
return false;
}
@Override
protected void renderExpressionAsClauseItem(Expression expression) {
expression.accept( this );
}
@Override
protected void visitRecursivePath(Expression recursivePath, int sizeEstimate) {
// MariaDB determines the type and size of a column in a recursive CTE based on the expression of the non-recursive part
// Due to that, we have to cast the path in the non-recursive path to a varchar of appropriate size to avoid data truncation errors
if ( sizeEstimate == -1 ) {
super.visitRecursivePath( recursivePath, sizeEstimate );
}
else {
appendSql( "cast(" );
recursivePath.accept( this );
appendSql( " as char(" );
appendSql( sizeEstimate );
appendSql( "))" );
}
}
@Override
public void visitBooleanExpressionPredicate(BooleanExpressionPredicate booleanExpressionPredicate) {
final boolean isNegated = booleanExpressionPredicate.isNegated();
if ( isNegated ) {
appendSql( "not(" );
}
booleanExpressionPredicate.getExpression().accept( this );
if ( isNegated ) {
appendSql( CLOSE_PARENTHESIS );
}
}
@Override
protected String getForShare(int timeoutMillis) {
return " lock in share mode";
}
protected boolean shouldEmulateFetchClause(QueryPart queryPart) {
// Check if current query part is already row numbering to avoid infinite recursion
return useOffsetFetchClause( queryPart ) && getQueryPartForRowNumbering() != queryPart && supportsWindowFunctions() && !isRowsOnlyFetchClauseType( queryPart );
}
@Override
protected boolean shouldEmulateLateralWithIntersect(QueryPart queryPart) {
// Intersect emulation requires nested correlation when no simple query grouping is possible
// and the query has an offset/fetch clause, so we have to disable the emulation in this case,
// because nested correlation is not supported though
return supportsSimpleQueryGrouping() || !queryPart.hasOffsetOrFetchClause();
}
@Override
protected boolean supportsNestedSubqueryCorrelation() {
// It seems it doesn't support it
return false;
}
@Override
public void visitQueryGroup(QueryGroup queryGroup) {
if ( shouldEmulateFetchClause( queryGroup ) ) {
emulateFetchOffsetWithWindowFunctions( queryGroup, true );
}
else {
super.visitQueryGroup( queryGroup );
}
}
@Override
public void visitQuerySpec(QuerySpec querySpec) {
if ( shouldEmulateFetchClause( querySpec ) ) {
emulateFetchOffsetWithWindowFunctions( querySpec, true );
}
else {
super.visitQuerySpec( querySpec );
}
}
@Override
public void visitQueryPartTableReference(QueryPartTableReference tableReference) {
emulateQueryPartTableReferenceColumnAliasing( tableReference );
}
@Override
public void visitOffsetFetchClause(QueryPart queryPart) {
if ( !isRowNumberingCurrentQueryPart() ) {
renderCombinedLimitClause( queryPart );
}
}
@Override
protected void renderComparison(Expression lhs, ComparisonOperator operator, Expression rhs) {
renderComparisonDistinctOperator( lhs, operator, rhs );
}
@Override
protected void renderPartitionItem(Expression expression) {
if ( expression instanceof Literal ) {
appendSql( "'0'" );
}
else if ( expression instanceof Summarization ) {
Summarization summarization = (Summarization) expression;
renderCommaSeparated( summarization.getGroupings() );
appendSql( " with " );
appendSql( summarization.getKind().sqlText() );
}
else {
expression.accept( this );
}
}
@Override
public void visitLikePredicate(LikePredicate likePredicate) {
if ( likePredicate.isCaseSensitive() ) {
likePredicate.getMatchExpression().accept( this );
if ( likePredicate.isNegated() ) {
appendSql( " not" );
}
appendSql( " like " );
renderBackslashEscapedLikePattern(
likePredicate.getPattern(),
likePredicate.getEscapeCharacter(),
getDialect().isNoBackslashEscapesEnabled()
);
}
else {
appendSql( getDialect().getLowercaseFunction() );
appendSql( OPEN_PARENTHESIS );
likePredicate.getMatchExpression().accept( this );
appendSql( CLOSE_PARENTHESIS );
if ( likePredicate.isNegated() ) {
appendSql( " not" );
}
appendSql( " like " );
appendSql( getDialect().getLowercaseFunction() );
appendSql( OPEN_PARENTHESIS );
renderBackslashEscapedLikePattern(
likePredicate.getPattern(),
likePredicate.getEscapeCharacter(),
getDialect().isNoBackslashEscapesEnabled()
);
appendSql( CLOSE_PARENTHESIS );
}
if ( likePredicate.getEscapeCharacter() != null ) {
appendSql( " escape " );
likePredicate.getEscapeCharacter().accept( this );
}
}
@Override
public boolean supportsRowValueConstructorSyntaxInSet() {
return false;
}
@Override
protected boolean supportsRowValueConstructorSyntaxInQuantifiedPredicates() {
return false;
}
@Override
protected boolean supportsIntersect() {
return true;
}
@Override
protected boolean supportsDistinctFromPredicate() {
// It supports a proprietary operator
return true;
}
@Override
protected String getDual() {
return "dual";
}
@Override
public MariaDBDialect getDialect() {
return this.dialect;
}
private boolean supportsWindowFunctions() {
return true;
}
@Override
public void visitCastTarget(CastTarget castTarget) {
String sqlType = MySQLSqlAstTranslator.getSqlType( castTarget, getSessionFactory() );
if ( sqlType != null ) {
appendSql( sqlType );
}
else {
super.visitCastTarget( castTarget );
}
}
@Override
protected void renderStringContainsExactlyPredicate(Expression haystack, Expression needle) {
// MariaDB can't cope with NUL characters in the position function, so we use a like predicate instead
haystack.accept( this );
appendSql( " like concat('%',replace(replace(replace(" );
needle.accept( this );
appendSql( ",'~','~~'),'?','~?'),'%','~%'),'%') escape '~'" );
}
}