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MySQLSqlAstTranslator.java
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MySQLSqlAstTranslator.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 java.util.Locale;
import org.hibernate.engine.jdbc.Size;
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.from.ValuesTableReference;
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 MySQL.
*
* @author Christian Beikov
*/
public class MySQLSqlAstTranslator<T extends JdbcOperation> extends AbstractSqlAstTranslator<T> {
public MySQLSqlAstTranslator(SessionFactoryImplementor sessionFactory, Statement statement) {
super( sessionFactory, statement );
}
/**
* @deprecated Use {@link #getSqlType(CastTarget, SessionFactoryImplementor)} instead
*/
@Deprecated(forRemoval = true)
public static String getSqlType(CastTarget castTarget, Dialect dialect) {
return getSqlType( castTarget, castTarget.getSqlType(), dialect );
}
public static String getSqlType(CastTarget castTarget, SessionFactoryImplementor factory) {
final String sqlType = getCastTypeName( castTarget, factory.getTypeConfiguration() );
return getSqlType( castTarget, sqlType, factory.getJdbcServices().getDialect() );
}
private static String getSqlType(CastTarget castTarget, String sqlType, Dialect dialect) {
if ( sqlType != null ) {
int parenthesesIndex = sqlType.indexOf( '(' );
final String baseName = parenthesesIndex == -1 ? sqlType : sqlType.substring( 0, parenthesesIndex );
switch ( baseName.toLowerCase( Locale.ROOT ) ) {
case "bit":
return "unsigned";
case "tinyint":
case "smallint":
case "integer":
case "bigint":
return "signed";
case "float":
case "real":
case "double precision":
final int precision = castTarget.getPrecision() == null ?
dialect.getDefaultDecimalPrecision() :
castTarget.getPrecision();
final int scale = castTarget.getScale() == null ? Size.DEFAULT_SCALE : castTarget.getScale();
return "decimal(" + precision + "," + scale + ")";
case "char":
case "varchar":
case "nchar":
case "nvarchar":
return castTarget.getLength() == null
? "char"
: ( "char(" + castTarget.getLength() + ")" );
case "binary":
case "varbinary":
return castTarget.getLength() == null
? "binary"
: ( "binary(" + castTarget.getLength() + ")" );
}
}
return sqlType;
}
@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() );
if ( statement.getConflictClause() != null && getDialect().getMySQLVersion().isSameOrAfter( 8, 0, 19 ) ) {
appendSql( " as excluded" );
char separator = '(';
for ( ColumnReference targetColumn : statement.getTargetColumns() ) {
appendSql( separator );
appendSql( targetColumn.getColumnExpression() );
separator = ',';
}
appendSql( ')' );
}
}
}
@Override
public void visitColumnReference(ColumnReference columnReference) {
final Statement currentStatement;
if ( getDialect().getMySQLVersion().isBefore( 8, 0, 19 )
&& "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 MySQL 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 void renderExpressionAsClauseItem(Expression expression) {
expression.accept( this );
}
@Override
protected void visitRecursivePath(Expression recursivePath, int sizeEstimate) {
// MySQL 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 " for share";
}
protected boolean shouldEmulateFetchClause(QueryPart queryPart) {
// Check if current query part is already row numbering to avoid infinite recursion
return useOffsetFetchClause( queryPart ) && getQueryPartForRowNumbering() != queryPart
&& getDialect().supportsWindowFunctions() && !isRowsOnlyFetchClauseType( queryPart );
}
@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 visitValuesTableReference(ValuesTableReference tableReference) {
emulateValuesTableReferenceColumnAliasing( 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) {
// Custom implementation because MySQL uses backslash as the default escape character
if ( getDialect().getVersion().isSameOrAfter( 8, 0, 24 ) ) {
// From version 8.0.24 we can override this by specifying an empty escape character
// See https://dev.mysql.com/doc/refman/8.0/en/string-comparison-functions.html#operator_like
super.visitLikePredicate( likePredicate );
if ( !getDialect().isNoBackslashEscapesEnabled() && likePredicate.getEscapeCharacter() == null ) {
appendSql( " escape ''" );
}
}
else {
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
public boolean supportsRowValueConstructorSyntaxInInList() {
return true;
}
@Override
protected boolean supportsRowValueConstructorSyntaxInQuantifiedPredicates() {
return false;
}
@Override
protected boolean supportsIntersect() {
return false;
}
@Override
protected boolean supportsDistinctFromPredicate() {
// It supports a proprietary operator
return true;
}
@Override
protected boolean supportsSimpleQueryGrouping() {
return true;
}
@Override
protected boolean supportsNestedSubqueryCorrelation() {
return false;
}
@Override
protected boolean supportsWithClause() {
return true;
}
@Override
protected String getDual() {
return "dual";
}
@Override
public MySQLDialect getDialect() {
return (MySQLDialect) DialectDelegateWrapper.extractRealDialect( super.getDialect() );
}
@Override
public void visitCastTarget(CastTarget castTarget) {
String sqlType = getSqlType( castTarget, getSessionFactory() );
if ( sqlType != null ) {
appendSql( sqlType );
}
else {
super.visitCastTarget( castTarget );
}
}
@Override
protected void renderStringContainsExactlyPredicate(Expression haystack, Expression needle) {
// MySQL 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 '~'" );
}
}