org.tinygroup.jsqlparser.util.deparser.SelectDeParser Maven / Gradle / Ivy
/**
* Copyright (c) 1997-2013, www.tinygroup.org ([email protected]).
*
* Licensed under the GPL, Version 3.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.gnu.org/licenses/gpl.html
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.tinygroup.jsqlparser.util.deparser;
import org.tinygroup.jsqlparser.expression.Alias;
import org.tinygroup.jsqlparser.expression.Expression;
import org.tinygroup.jsqlparser.expression.ExpressionVisitor;
import org.tinygroup.jsqlparser.schema.Column;
import org.tinygroup.jsqlparser.schema.Table;
import org.tinygroup.jsqlparser.statement.select.*;
import java.util.Iterator;
import java.util.List;
/**
* A class to de-parse (that is, tranform from JSqlParser hierarchy into a
* string) a {@link org.tinygroup.jsqlparser.statement.select.Select}
*/
public class SelectDeParser implements SelectVisitor, OrderByVisitor, SelectItemVisitor, FromItemVisitor, PivotVisitor {
protected StringBuilder buffer;
protected ExpressionVisitor expressionVisitor;
public SelectDeParser() {
}
/**
* @param expressionVisitor a {@link ExpressionVisitor} to de-parse
* expressions. It has to share the same
* StringBuilder (buffer parameter) as this object in order to work
* @param buffer the buffer that will be filled with the select
*/
public SelectDeParser(ExpressionVisitor expressionVisitor, StringBuilder buffer) {
this.buffer = buffer;
this.expressionVisitor = expressionVisitor;
}
public void visit(PlainSelect plainSelect) {
buffer.append("SELECT ");
if (plainSelect.getDistinct() != null) {
buffer.append("DISTINCT ");
if (plainSelect.getDistinct().getOnSelectItems() != null) {
buffer.append("ON (");
for (Iterator iter = plainSelect.getDistinct().getOnSelectItems().iterator(); iter.hasNext();) {
SelectItem selectItem = iter.next();
selectItem.accept(this);
if (iter.hasNext()) {
buffer.append(", ");
}
}
buffer.append(") ");
}
}
Top top = plainSelect.getTop();
if (top != null) {
buffer.append(top).append(" ");
}
for (Iterator iter = plainSelect.getSelectItems().iterator(); iter.hasNext();) {
SelectItem selectItem = iter.next();
selectItem.accept(this);
if (iter.hasNext()) {
buffer.append(", ");
}
}
if (plainSelect.getIntoTables() != null) {
buffer.append(" INTO ");
for (Iterator iter = plainSelect.getIntoTables().iterator(); iter.hasNext();) {
visit(iter.next());
if (iter.hasNext()) {
buffer.append(", ");
}
}
}
if (plainSelect.getFromItem() != null) {
buffer.append(" FROM ");
plainSelect.getFromItem().accept(this);
}
if (plainSelect.getJoins() != null) {
for (Join join : plainSelect.getJoins()) {
deparseJoin(join);
}
}
if (plainSelect.getWhere() != null) {
buffer.append(" WHERE ");
plainSelect.getWhere().accept(expressionVisitor);
}
if (plainSelect.getOracleHierarchical() != null) {
plainSelect.getOracleHierarchical().accept(expressionVisitor);
}
if (plainSelect.getGroupByColumnReferences() != null) {
buffer.append(" GROUP BY ");
for (Iterator iter = plainSelect.getGroupByColumnReferences().iterator(); iter.hasNext();) {
Expression columnReference = iter.next();
columnReference.accept(expressionVisitor);
if (iter.hasNext()) {
buffer.append(", ");
}
}
}
if (plainSelect.getHaving() != null) {
buffer.append(" HAVING ");
plainSelect.getHaving().accept(expressionVisitor);
}
if (plainSelect.getOrderByElements() != null) {
deparseOrderBy(plainSelect.isOracleSiblings(), plainSelect.getOrderByElements());
}
if (plainSelect.getLimit() != null) {
deparseLimit(plainSelect.getLimit());
}
if (plainSelect.getOffset() != null) {
deparseOffset(plainSelect.getOffset());
}
if (plainSelect.getFetch() != null) {
deparseFetch(plainSelect.getFetch());
}
if (plainSelect.isForUpdate()) {
buffer.append(" FOR UPDATE");
}
}
public void visit(OrderByElement orderBy) {
orderBy.getExpression().accept(expressionVisitor);
if (!orderBy.isAsc()) {
buffer.append(" DESC");
} else if (orderBy.isAscDescPresent()) {
buffer.append(" ASC");
}
if (orderBy.getNullOrdering() != null) {
buffer.append(' ');
buffer.append(orderBy.getNullOrdering() == OrderByElement.NullOrdering.NULLS_FIRST ? "NULLS FIRST" : "NULLS LAST");
}
}
public void visit(Column column) {
buffer.append(column.getFullyQualifiedName());
}
public void visit(AllTableColumns allTableColumns) {
buffer.append(allTableColumns.getTable().getFullyQualifiedName()).append(".*");
}
public void visit(SelectExpressionItem selectExpressionItem) {
selectExpressionItem.getExpression().accept(expressionVisitor);
if (selectExpressionItem.getAlias() != null) {
buffer.append(selectExpressionItem.getAlias().toString());
}
}
public void visit(SubSelect subSelect) {
buffer.append("(");
subSelect.getSelectBody().accept(this);
buffer.append(")");
Pivot pivot = subSelect.getPivot();
if (pivot != null) {
pivot.accept(this);
}
Alias alias = subSelect.getAlias();
if (alias != null) {
buffer.append(alias.toString());
}
}
public void visit(Table tableName) {
buffer.append(tableName.getFullyQualifiedName());
Pivot pivot = tableName.getPivot();
if (pivot != null) {
pivot.accept(this);
}
Alias alias = tableName.getAlias();
if (alias != null) {
buffer.append(alias);
}
}
public void visit(Pivot pivot) {
List forColumns = pivot.getForColumns();
buffer.append(" PIVOT (")
.append(PlainSelect.getStringList(pivot.getFunctionItems()))
.append(" FOR ")
.append(PlainSelect.getStringList(forColumns, true, forColumns != null && forColumns.size() > 1))
.append(" IN ")
.append(PlainSelect.getStringList(pivot.getInItems(), true, true))
.append(")");
}
public void visit(PivotXml pivot) {
List forColumns = pivot.getForColumns();
buffer.append(" PIVOT XML (")
.append(PlainSelect.getStringList(pivot.getFunctionItems()))
.append(" FOR ")
.append(PlainSelect.getStringList(forColumns, true, forColumns != null && forColumns.size() > 1))
.append(" IN (");
if (pivot.isInAny()) {
buffer.append("ANY");
} else if (pivot.getInSelect() != null) {
buffer.append(pivot.getInSelect());
} else {
buffer.append(PlainSelect.getStringList(pivot.getInItems()));
}
buffer.append("))");
}
public void deparseOrderBy(List orderByElements) {
deparseOrderBy(false, orderByElements);
}
public void deparseOrderBy(boolean oracleSiblings, List orderByElements) {
if (oracleSiblings) {
buffer.append(" ORDER SIBLINGS BY ");
} else {
buffer.append(" ORDER BY ");
}
for (Iterator iter = orderByElements.iterator(); iter.hasNext();) {
OrderByElement orderByElement = iter.next();
orderByElement.accept(this);
if (iter.hasNext()) {
buffer.append(", ");
}
}
}
public void deparseLimit(Limit limit) {
// LIMIT n OFFSET skip
if (limit.isRowCountJdbcParameter()) {
buffer.append(" LIMIT ");
buffer.append("?");
} else if (limit.getRowCount() >= 0) {
buffer.append(" LIMIT ");
buffer.append(limit.getRowCount());
} else if (limit.isLimitNull()) {
buffer.append(" LIMIT NULL");
}
if (limit.isOffsetJdbcParameter()) {
buffer.append(" OFFSET ?");
} else if (limit.getOffset() != 0) {
buffer.append(" OFFSET ").append(limit.getOffset());
}
}
public void deparseOffset(Offset offset) {
// OFFSET offset
// or OFFSET offset (ROW | ROWS)
if (offset.isOffsetJdbcParameter()) {
buffer.append(" OFFSET ?");
} else if (offset.getOffset() != 0) {
buffer.append(" OFFSET ");
buffer.append(offset.getOffset());
}
if (offset.getOffsetParam() != null) {
buffer.append(" ").append(offset.getOffsetParam());
}
}
public void deparseFetch(Fetch fetch) {
// FETCH (FIRST | NEXT) row_count (ROW | ROWS) ONLY
buffer.append(" FETCH ");
if (fetch.isFetchParamFirst()) {
buffer.append("FIRST ");
} else {
buffer.append("NEXT ");
}
if (fetch.isFetchJdbcParameter()) {
buffer.append("?");
} else {
buffer.append(fetch.getRowCount());
}
buffer.append(" ").append(fetch.getFetchParam()).append(" ONLY");
}
public StringBuilder getBuffer() {
return buffer;
}
public void setBuffer(StringBuilder buffer) {
this.buffer = buffer;
}
public ExpressionVisitor getExpressionVisitor() {
return expressionVisitor;
}
public void setExpressionVisitor(ExpressionVisitor visitor) {
expressionVisitor = visitor;
}
public void visit(SubJoin subjoin) {
buffer.append("(");
subjoin.getLeft().accept(this);
deparseJoin(subjoin.getJoin());
buffer.append(")");
if (subjoin.getPivot() != null) {
subjoin.getPivot().accept(this);
}
}
public void deparseJoin(Join join) {
if (join.isSimple()) {
buffer.append(", ");
} else {
if (join.isRight()) {
buffer.append(" RIGHT");
} else if (join.isNatural()) {
buffer.append(" NATURAL");
} else if (join.isFull()) {
buffer.append(" FULL");
} else if (join.isLeft()) {
buffer.append(" LEFT");
} else if (join.isCross()) {
buffer.append(" CROSS");
}
if (join.isOuter()) {
buffer.append(" OUTER");
} else if (join.isInner()) {
buffer.append(" INNER");
}
buffer.append(" JOIN ");
}
FromItem fromItem = join.getRightItem();
fromItem.accept(this);
if (join.getOnExpression() != null) {
buffer.append(" ON ");
join.getOnExpression().accept(expressionVisitor);
}
if (join.getUsingColumns() != null) {
buffer.append(" USING (");
for (Iterator iterator = join.getUsingColumns().iterator(); iterator.hasNext();) {
Column column = iterator.next();
buffer.append(column.getFullyQualifiedName());
if (iterator.hasNext()) {
buffer.append(", ");
}
}
buffer.append(")");
}
}
public void visit(SetOperationList list) {
for (int i = 0; i < list.getPlainSelects().size(); i++) {
if (i != 0) {
buffer.append(' ').append(list.getOperations().get(i - 1)).append(' ');
}
buffer.append("(");
PlainSelect plainSelect = list.getPlainSelects().get(i);
plainSelect.accept(this);
buffer.append(")");
}
if (list.getOrderByElements() != null) {
deparseOrderBy(list.getOrderByElements());
}
if (list.getLimit() != null) {
deparseLimit(list.getLimit());
}
if (list.getOffset() != null) {
deparseOffset(list.getOffset());
}
if (list.getFetch() != null) {
deparseFetch(list.getFetch());
}
}
public void visit(WithItem withItem) {
buffer.append(withItem.getName());
if (withItem.getWithItemList()!=null) {
buffer.append(" ").append(PlainSelect.getStringList(withItem.getWithItemList(), true, true));
}
buffer.append(" AS (");
withItem.getSelectBody().accept(this);
buffer.append(")");
}
public void visit(LateralSubSelect lateralSubSelect) {
buffer.append(lateralSubSelect.toString());
}
public void visit(ValuesList valuesList) {
buffer.append(valuesList.toString());
}
public void visit(AllColumns allColumns) {
buffer.append('*');
}
}
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