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An JDBC datasource implementation.
/*
* Copyright 1999-2017 Alibaba Group Holding Ltd.
*
* 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.alibaba.druid.sql.dialect.mysql.parser;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLSetQuantifier;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.expr.SQLLiteralExpr;
import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
import com.alibaba.druid.sql.ast.statement.*;
import com.alibaba.druid.sql.dialect.mysql.ast.*;
import com.alibaba.druid.sql.dialect.mysql.ast.clause.MySqlSelectIntoStatement;
import com.alibaba.druid.sql.dialect.mysql.ast.expr.MySqlOutFileExpr;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
import com.alibaba.druid.sql.parser.ParserException;
import com.alibaba.druid.sql.parser.SQLExprParser;
import com.alibaba.druid.sql.parser.SQLSelectParser;
import com.alibaba.druid.sql.parser.Token;
import com.alibaba.druid.util.FnvHash;
import java.util.ArrayList;
import java.util.List;
/**
* @author zz [[email protected]]
*/
public class MySqlSelectIntoParser extends SQLSelectParser {
private List argsList;
public MySqlSelectIntoParser(SQLExprParser exprParser) {
super(exprParser);
}
public MySqlSelectIntoParser(String sql) {
this(new MySqlExprParser(sql));
}
public MySqlSelectIntoStatement parseSelectInto() {
SQLSelect select = select();
MySqlSelectIntoStatement stmt = new MySqlSelectIntoStatement();
stmt.setSelect(select);
stmt.setVarList(argsList);
return stmt;
}
@Override
public SQLSelectQuery query(SQLObject parent, boolean acceptUnion) {
if (lexer.token() == (Token.LPAREN)) {
lexer.nextToken();
SQLSelectQuery select = query();
accept(Token.RPAREN);
return queryRest(select, acceptUnion);
}
MySqlSelectQueryBlock queryBlock = new MySqlSelectQueryBlock();
if (lexer.token() == Token.SELECT) {
lexer.nextToken();
if (lexer.token() == Token.HINT) {
this.exprParser.parseHints(queryBlock.getHints());
}
if (lexer.token() == Token.COMMENT) {
lexer.nextToken();
}
if (lexer.token() == (Token.DISTINCT)) {
queryBlock.setDistionOption(SQLSetQuantifier.DISTINCT);
lexer.nextToken();
} else if (lexer.identifierEquals("DISTINCTROW")) {
queryBlock.setDistionOption(SQLSetQuantifier.DISTINCTROW);
lexer.nextToken();
} else if (lexer.token() == (Token.ALL)) {
queryBlock.setDistionOption(SQLSetQuantifier.ALL);
lexer.nextToken();
}
if (lexer.identifierEquals("HIGH_PRIORITY")) {
queryBlock.setHignPriority(true);
lexer.nextToken();
}
if (lexer.identifierEquals("STRAIGHT_JOIN")) {
queryBlock.setStraightJoin(true);
lexer.nextToken();
}
if (lexer.identifierEquals("SQL_SMALL_RESULT")) {
queryBlock.setSmallResult(true);
lexer.nextToken();
}
if (lexer.identifierEquals("SQL_BIG_RESULT")) {
queryBlock.setBigResult(true);
lexer.nextToken();
}
if (lexer.identifierEquals("SQL_BUFFER_RESULT")) {
queryBlock.setBufferResult(true);
lexer.nextToken();
}
if (lexer.identifierEquals("SQL_CACHE")) {
queryBlock.setCache(true);
lexer.nextToken();
}
if (lexer.identifierEquals("SQL_NO_CACHE")) {
queryBlock.setCache(false);
lexer.nextToken();
}
if (lexer.identifierEquals("SQL_CALC_FOUND_ROWS")) {
queryBlock.setCalcFoundRows(true);
lexer.nextToken();
}
parseSelectList(queryBlock);
argsList = parseIntoArgs();
}
parseFrom(queryBlock);
parseWhere(queryBlock);
parseGroupBy(queryBlock);
queryBlock.setOrderBy(this.exprParser.parseOrderBy());
if (lexer.token() == Token.LIMIT) {
queryBlock.setLimit(this.exprParser.parseLimit());
}
if (lexer.token() == Token.PROCEDURE) {
lexer.nextToken();
throw new ParserException("TODO. " + lexer.info());
}
parseInto(queryBlock);
if (lexer.token() == Token.FOR) {
lexer.nextToken();
accept(Token.UPDATE);
queryBlock.setForUpdate(true);
}
if (lexer.token() == Token.LOCK) {
lexer.nextToken();
accept(Token.IN);
acceptIdentifier("SHARE");
acceptIdentifier("MODE");
queryBlock.setLockInShareMode(true);
}
return queryRest(queryBlock, acceptUnion);
}
/**
* Parses the arguments for the INTO clause and returns a list of SQL expressions.
*
* @return a list of SQL expressions representing the arguments passed to the INTO clause
*/
protected List parseIntoArgs() {
List args = new ArrayList();
if (lexer.token() == (Token.INTO)) {
accept(Token.INTO);
//lexer.nextToken();
for (; ; ) {
SQLExpr var = exprParser.primary();
if (var instanceof SQLIdentifierExpr) {
var = new SQLVariantRefExpr(
((SQLIdentifierExpr) var).getName());
}
args.add(var);
if (lexer.token() == Token.COMMA) {
accept(Token.COMMA);
continue;
} else {
break;
}
}
}
return args;
}
protected void parseInto(SQLSelectQueryBlock queryBlock) {
if (lexer.token() == (Token.INTO)) {
lexer.nextToken();
if (lexer.identifierEquals("OUTFILE")) {
lexer.nextToken();
MySqlOutFileExpr outFile = new MySqlOutFileExpr();
outFile.setFile(expr());
queryBlock.setInto(outFile);
if (lexer.identifierEquals("FIELDS") || lexer.identifierEquals("COLUMNS")) {
lexer.nextToken();
if (lexer.identifierEquals("TERMINATED")) {
lexer.nextToken();
accept(Token.BY);
}
outFile.setColumnsTerminatedBy((SQLLiteralExpr) expr());
if (lexer.identifierEquals("OPTIONALLY")) {
lexer.nextToken();
outFile.setColumnsEnclosedOptionally(true);
}
if (lexer.identifierEquals("ENCLOSED")) {
lexer.nextToken();
accept(Token.BY);
outFile.setColumnsEnclosedBy((SQLLiteralExpr) expr());
}
if (lexer.identifierEquals("ESCAPED")) {
lexer.nextToken();
accept(Token.BY);
outFile.setColumnsEscaped((SQLLiteralExpr) expr());
}
}
if (lexer.identifierEquals("LINES")) {
lexer.nextToken();
if (lexer.identifierEquals("STARTING")) {
lexer.nextToken();
accept(Token.BY);
outFile.setLinesStartingBy((SQLLiteralExpr) expr());
} else {
lexer.identifierEquals("TERMINATED");
lexer.nextToken();
accept(Token.BY);
outFile.setLinesTerminatedBy((SQLLiteralExpr) expr());
}
}
} else {
queryBlock.setInto(this.exprParser.name());
}
}
}
public SQLTableSource parseTableSourceRest(SQLTableSource tableSource) {
if (lexer.identifierEquals("USING")) {
return tableSource;
}
parseIndexHintList(tableSource);
return super.parseTableSourceRest(tableSource);
}
private void parseIndexHintList(SQLTableSource tableSource) {
if (lexer.token() == Token.USE) {
lexer.nextToken();
MySqlUseIndexHint hint = new MySqlUseIndexHint();
parseIndexHint(hint);
tableSource.getHints().add(hint);
parseIndexHintList(tableSource);
}
if (lexer.identifierEquals("IGNORE")) {
lexer.nextToken();
MySqlIgnoreIndexHint hint = new MySqlIgnoreIndexHint();
parseIndexHint(hint);
tableSource.getHints().add(hint);
parseIndexHintList(tableSource);
}
if (lexer.identifierEquals(FnvHash.Constants.FORCE)) {
lexer.nextToken();
MySqlForceIndexHint hint = new MySqlForceIndexHint();
parseIndexHint(hint);
tableSource.getHints().add(hint);
parseIndexHintList(tableSource);
}
}
private void parseIndexHint(MySqlIndexHintImpl hint) {
if (lexer.token() == Token.INDEX) {
lexer.nextToken();
} else {
accept(Token.KEY);
}
if (lexer.token() == Token.FOR) {
lexer.nextToken();
if (lexer.token() == Token.JOIN) {
lexer.nextToken();
hint.setOption(MySqlIndexHint.Option.JOIN);
} else if (lexer.token() == Token.ORDER) {
lexer.nextToken();
accept(Token.BY);
hint.setOption(MySqlIndexHint.Option.ORDER_BY);
} else {
accept(Token.GROUP);
accept(Token.BY);
hint.setOption(MySqlIndexHint.Option.GROUP_BY);
}
}
accept(Token.LPAREN);
if (lexer.token() == Token.PRIMARY) {
lexer.nextToken();
hint.getIndexList().add(new SQLIdentifierExpr("PRIMARY"));
} else {
this.exprParser.names(hint.getIndexList());
}
accept(Token.RPAREN);
}
public SQLUnionQuery unionRest(SQLUnionQuery union) {
if (lexer.token() == Token.LIMIT) {
union.setLimit(this.exprParser.parseLimit());
}
return super.unionRest(union);
}
public MySqlExprParser getExprParser() {
return (MySqlExprParser) exprParser;
}
}