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ob-sql-parser parses an SQL statement into a Java classes.
/*
* Copyright (c) 2023 OceanBase.
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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 com.oceanbase.tools.sqlparser.adapter.oracle;
import java.util.List;
import java.util.stream.Collectors;
import org.antlr.v4.runtime.ParserRuleContext;
import org.antlr.v4.runtime.RuleContext;
import org.antlr.v4.runtime.tree.TerminalNode;
import com.oceanbase.tools.sqlparser.adapter.StatementFactory;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.ExprContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.From_listContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Groupby_clauseContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Query_expression_option_listContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_clauseContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_clause_setContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_clause_set_leftContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_clause_set_rightContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_expr_listContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_no_parensContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_with_hierarchical_queryContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Select_with_parensContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Set_expression_optionContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Set_typeContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.Simple_selectContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.SubqueryContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.With_clauseContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParser.With_selectContext;
import com.oceanbase.tools.sqlparser.oboracle.OBParserBaseVisitor;
import com.oceanbase.tools.sqlparser.statement.Expression;
import com.oceanbase.tools.sqlparser.statement.select.FromReference;
import com.oceanbase.tools.sqlparser.statement.select.GroupBy;
import com.oceanbase.tools.sqlparser.statement.select.OrderBy;
import com.oceanbase.tools.sqlparser.statement.select.Projection;
import com.oceanbase.tools.sqlparser.statement.select.RelatedSelectBody;
import com.oceanbase.tools.sqlparser.statement.select.RelationType;
import com.oceanbase.tools.sqlparser.statement.select.SelectBody;
import com.oceanbase.tools.sqlparser.statement.select.WithTable;
import com.oceanbase.tools.sqlparser.statement.select.oracle.Fetch;
import lombok.NonNull;
/**
* {@link OracleSelectBodyFactory}
*
* @author yh263208
* @date 2022-11-25 16:13
* @since ODC_release_4.1.0
* @see OBParserBaseVisitor
*/
public class OracleSelectBodyFactory extends OBParserBaseVisitor implements StatementFactory {
private SubqueryContext subqueryContext = null;
private Select_no_parensContext selectNoParensContext = null;
private With_selectContext withSelectContext = null;
private Select_with_parensContext selectWithParensContext = null;
public OracleSelectBodyFactory(@NonNull With_selectContext withSelectContext) {
this.withSelectContext = withSelectContext;
}
public OracleSelectBodyFactory(@NonNull Select_no_parensContext selectNoParensContext) {
this.selectNoParensContext = selectNoParensContext;
}
public OracleSelectBodyFactory(@NonNull SubqueryContext subqueryContext) {
this.subqueryContext = subqueryContext;
}
public OracleSelectBodyFactory(@NonNull Select_with_parensContext selectWithParensContext) {
this.selectWithParensContext = selectWithParensContext;
}
@Override
public SelectBody generate() {
if (this.selectNoParensContext != null) {
return visit(this.selectNoParensContext);
} else if (this.subqueryContext != null) {
return visit(this.subqueryContext);
} else if (this.selectWithParensContext != null) {
return visit(this.selectWithParensContext);
} else if (this.withSelectContext != null) {
return visit(this.withSelectContext);
}
throw new IllegalStateException("No Context available");
}
@Override
public SelectBody visitSubquery(SubqueryContext ctx) {
if (ctx.select_no_parens() != null) {
return visit(ctx.select_no_parens());
} else if (ctx.select_with_parens() != null) {
return visit(ctx.select_with_parens());
} else if (ctx.with_select() != null) {
return visit(ctx.with_select());
}
throw new IllegalStateException("No alternative node");
}
@Override
public SelectBody visitSelect_with_parens(Select_with_parensContext ctx) {
if (ctx.select_with_parens() != null) {
return visit(ctx.select_with_parens());
}
SelectBody select;
if (ctx.select_no_parens() != null) {
select = new SelectBody(ctx, visit(ctx.select_no_parens()));
} else if (ctx.with_select() != null) {
select = new SelectBody(ctx, visit(ctx.with_select()));
} else {
throw new IllegalStateException("No alternative node");
}
if (ctx.order_by() != null) {
StatementFactory factory = new OracleOrderByFactory(ctx.order_by());
select.getLastSelectBody().setOrderBy(factory.generate());
}
if (ctx.fetch_next_clause() != null) {
StatementFactory factory = new OracleFetchFactory(ctx.fetch_next_clause());
select.getLastSelectBody().setFetch(factory.generate());
}
return select;
}
@Override
public SelectBody visitSelect_no_parens(Select_no_parensContext ctx) {
if (ctx.select_clause() != null) {
return visit(ctx.select_clause());
}
return visit(ctx.select_clause_set());
}
@Override
public SelectBody visitWith_select(With_selectContext ctx) {
SelectBody select;
if (ctx.select_no_parens() != null) {
select = new SelectBody(ctx, visit(ctx.select_no_parens()));
} else {
select = new SelectBody(ctx, visit(ctx.select_with_parens()));
}
With_clauseContext withClause = ctx.with_clause();
if (withClause.RECURSIVE() != null) {
select.setRecursive(true);
}
if (withClause.common_table_expr() != null) {
StatementFactory factory = new OracleWithTableFactory(withClause.common_table_expr());
select.getWith().add(factory.generate());
} else if (withClause.with_list() != null) {
withClause.with_list().common_table_expr().forEach(c -> {
StatementFactory factory = new OracleWithTableFactory(c);
select.getWith().add(factory.generate());
});
}
return select;
}
@Override
public SelectBody visitSelect_clause_set(Select_clause_setContext ctx) {
SelectBody left;
SelectBody right = visit(ctx.select_clause_set_right());
if (ctx.select_clause_set() != null) {
left = new SelectBody(ctx, visit(ctx.select_clause_set()));
} else if (ctx.select_clause_set_left() != null) {
left = new SelectBody(ctx, visit(ctx.select_clause_set_left()));
} else {
throw new IllegalStateException("Node is not found");
}
Set_typeContext type = ctx.set_type();
if (type == null) {
throw new IllegalStateException("Missing set top node");
}
RelationType relationType;
if (type.set_type_other() != null) {
relationType = RelationType.valueOf(type.set_type_other().getText());
} else {
Set_expression_optionContext o = type.set_expression_option();
relationType = RelationType.UNION;
if (o != null && o.ALL() != null) {
relationType = RelationType.UNION_ALL;
}
}
left.getLastSelectBody().setRelatedSelect(new RelatedSelectBody(right, relationType));
return left;
}
@Override
public SelectBody visitSelect_clause_set_right(Select_clause_set_rightContext ctx) {
if (ctx.simple_select() != null) {
return visit(ctx.simple_select());
} else if (ctx.select_with_hierarchical_query() != null) {
return visit(ctx.select_with_hierarchical_query());
}
return visit(ctx.select_with_parens());
}
@Override
public SelectBody visitSelect_clause_set_left(Select_clause_set_leftContext ctx) {
return visit(ctx.select_clause_set_right());
}
@Override
public SelectBody visitSelect_clause(Select_clauseContext ctx) {
if (ctx.simple_select() != null) {
return visit(ctx.simple_select());
}
return visit(ctx.select_with_hierarchical_query());
}
@Override
public SelectBody visitSelect_with_hierarchical_query(Select_with_hierarchical_queryContext ctx) {
SelectBody select = visitSelect(new SelectContext() {
@Override
public ParserRuleContext getTarget() {
return ctx;
}
@Override
public Select_expr_listContext projectionList() {
return ctx.select_expr_list();
}
@Override
public From_listContext fromList() {
return ctx.from_list();
}
@Override
public Groupby_clauseContext groupClause() {
return ctx.groupby_clause();
}
@Override
public TerminalNode whereNode() {
return ctx.WHERE();
}
@Override
public TerminalNode havingNode() {
return ctx.HAVING();
}
@Override
public List exprList() {
return ctx.expr();
}
@Override
public Query_expression_option_listContext queryOptionList() {
return ctx.query_expression_option_list();
}
});
if (ctx.start_with() != null) {
StatementFactory factory = new OracleExpressionFactory(ctx.start_with().expr());
select.setStartWith(factory.generate());
}
if (ctx.connect_by() != null) {
StatementFactory factory = new OracleExpressionFactory(ctx.connect_by().expr());
select.setConnectBy(factory.generate());
}
return select;
}
@Override
public SelectBody visitSimple_select(Simple_selectContext ctx) {
return visitSelect(new SelectContext() {
@Override
public ParserRuleContext getTarget() {
return ctx;
}
@Override
public Select_expr_listContext projectionList() {
return ctx.select_expr_list();
}
@Override
public From_listContext fromList() {
return ctx.from_list();
}
@Override
public Groupby_clauseContext groupClause() {
return ctx.groupby_clause();
}
@Override
public TerminalNode whereNode() {
return ctx.WHERE();
}
@Override
public TerminalNode havingNode() {
return ctx.HAVING();
}
@Override
public List exprList() {
return ctx.expr();
}
@Override
public Query_expression_option_listContext queryOptionList() {
return ctx.query_expression_option_list();
}
});
}
private SelectBody visitSelect(SelectContext ctx) {
List selectItems = visitProjectionList(ctx.projectionList());
List froms = visitFromList(ctx.fromList());
SelectBody select = new SelectBody(ctx.getTarget(), selectItems, froms);
ExprContext where = null;
ExprContext having = null;
if (ctx.whereNode() != null && ctx.havingNode() != null) {
// 既有 where 子句，也有 having 子句，此时第一个 expr 是 where 的，第二个是 having 的
where = ctx.exprList().get(0);
if (where == null) {
throw new IllegalStateException("Missing where clause");
}
having = ctx.exprList().get(1);
if (having == null) {
throw new IllegalStateException("Missing having clause");
}
} else if (ctx.whereNode() == null && ctx.havingNode() != null) {
having = ctx.exprList().get(0);
} else if (ctx.havingNode() == null && ctx.whereNode() != null) {
where = ctx.exprList().get(0);
}
if (where != null) {
StatementFactory factory = new OracleExpressionFactory(where);
select.setWhere(factory.generate());
}
if (having != null) {
StatementFactory factory = new OracleExpressionFactory(having);
select.setHaving(factory.generate());
}
if (ctx.groupClause() != null) {
select.setGroupBy(visitGroupByClause(ctx.groupClause()));
}
if (ctx.queryOptionList() != null) {
select.setQueryOptions(getQueryExpr(ctx.queryOptionList()));
}
return select;
}
private String getQueryExpr(Query_expression_option_listContext context) {
return context.query_expression_option().stream().map(RuleContext::getText).collect(Collectors.joining(" "));
}
private List visitProjectionList(Select_expr_listContext context) {
return context.projection().stream().map(child -> {
OracleProjectionFactory factory = new OracleProjectionFactory(child);
return factory.generate();
}).collect(Collectors.toList());
}
private List visitFromList(From_listContext context) {
return context.table_references().table_reference().stream().map(c -> {
StatementFactory factory = new OracleFromReferenceFactory(c);
return factory.generate();
}).collect(Collectors.toList());
}
private List visitGroupByClause(Groupby_clauseContext context) {
return context.groupby_element_list().groupby_element().stream().map(c -> {
StatementFactory factory = new OracleGroupByFactory(c);
return factory.generate();
}).collect(Collectors.toList());
}
/**
* {@link SelectContext}
*
* @author yh263208
* @date 2022-12-07 18:21
* @since ODC_release_4.1.0
*/
interface SelectContext {
ParserRuleContext getTarget();
Select_expr_listContext projectionList();
From_listContext fromList();
Groupby_clauseContext groupClause();
TerminalNode whereNode();
TerminalNode havingNode();
List exprList();
Query_expression_option_listContext queryOptionList();
}
}
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