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An JDBC datasource implementation.
/*
* Copyright 1999-2101 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 java.util.ArrayList;
import java.util.List;
import com.alibaba.druid.sql.ast.SQLExpr;
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.SQLSelect;
import com.alibaba.druid.sql.ast.statement.SQLSelectGroupByClause;
import com.alibaba.druid.sql.ast.statement.SQLSelectQuery;
import com.alibaba.druid.sql.ast.statement.SQLSelectQueryBlock;
import com.alibaba.druid.sql.ast.statement.SQLTableSource;
import com.alibaba.druid.sql.ast.statement.SQLUnionQuery;
import com.alibaba.druid.sql.dialect.mysql.ast.MySqlForceIndexHint;
import com.alibaba.druid.sql.dialect.mysql.ast.MySqlIgnoreIndexHint;
import com.alibaba.druid.sql.dialect.mysql.ast.MySqlIndexHint;
import com.alibaba.druid.sql.dialect.mysql.ast.MySqlIndexHintImpl;
import com.alibaba.druid.sql.dialect.mysql.ast.MySqlUseIndexHint;
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.MySqlSelectGroupBy;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlSelectQueryBlock.Limit;
import com.alibaba.druid.sql.dialect.mysql.ast.statement.MySqlUnionQuery;
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;
/**
*
* @Description: parse select into statement
* @author zz email:[email protected]
* @date 2015-9-14
* @version V1.0
*/
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() {
if (lexer.token() == (Token.LPAREN)) {
lexer.nextToken();
SQLSelectQuery select = query();
accept(Token.RPAREN);
return queryRest(select);
}
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 (identifierEquals("DISTINCTROW")) {
queryBlock.setDistionOption(SQLSetQuantifier.DISTINCTROW);
lexer.nextToken();
} else if (lexer.token() == (Token.ALL)) {
queryBlock.setDistionOption(SQLSetQuantifier.ALL);
lexer.nextToken();
}
if (identifierEquals("HIGH_PRIORITY")) {
queryBlock.setHignPriority(true);
lexer.nextToken();
}
if (identifierEquals("STRAIGHT_JOIN")) {
queryBlock.setStraightJoin(true);
lexer.nextToken();
}
if (identifierEquals("SQL_SMALL_RESULT")) {
queryBlock.setSmallResult(true);
lexer.nextToken();
}
if (identifierEquals("SQL_BIG_RESULT")) {
queryBlock.setBigResult(true);
lexer.nextToken();
}
if (identifierEquals("SQL_BUFFER_RESULT")) {
queryBlock.setBufferResult(true);
lexer.nextToken();
}
if (identifierEquals("SQL_CACHE")) {
queryBlock.setCache(true);
lexer.nextToken();
}
if (identifierEquals("SQL_NO_CACHE")) {
queryBlock.setCache(false);
lexer.nextToken();
}
if (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(parseLimit());
}
if (lexer.token() == Token.PROCEDURE) {
lexer.nextToken();
throw new ParserException("TODO");
}
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);
}
/**
* parser the select into arguments
* @return
*/
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 (identifierEquals("OUTFILE")) {
lexer.nextToken();
MySqlOutFileExpr outFile = new MySqlOutFileExpr();
outFile.setFile(expr());
queryBlock.setInto(outFile);
if (identifierEquals("FIELDS") || identifierEquals("COLUMNS")) {
lexer.nextToken();
if (identifierEquals("TERMINATED")) {
lexer.nextToken();
accept(Token.BY);
}
outFile.setColumnsTerminatedBy((SQLLiteralExpr) expr());
if (identifierEquals("OPTIONALLY")) {
lexer.nextToken();
outFile.setColumnsEnclosedOptionally(true);
}
if (identifierEquals("ENCLOSED")) {
lexer.nextToken();
accept(Token.BY);
outFile.setColumnsEnclosedBy((SQLLiteralExpr) expr());
}
if (identifierEquals("ESCAPED")) {
lexer.nextToken();
accept(Token.BY);
outFile.setColumnsEscaped((SQLLiteralExpr) expr());
}
}
if (identifierEquals("LINES")) {
lexer.nextToken();
if (identifierEquals("STARTING")) {
lexer.nextToken();
accept(Token.BY);
outFile.setLinesStartingBy((SQLLiteralExpr) expr());
} else {
identifierEquals("TERMINATED");
lexer.nextToken();
accept(Token.BY);
outFile.setLinesTerminatedBy((SQLLiteralExpr) expr());
}
}
} else {
queryBlock.setInto(this.exprParser.name());
}
}
}
protected void parseGroupBy(SQLSelectQueryBlock queryBlock) {
SQLSelectGroupByClause groupBy = null;
if (lexer.token() == Token.GROUP) {
groupBy = new SQLSelectGroupByClause();
lexer.nextToken();
accept(Token.BY);
while (true) {
groupBy.addItem(this.getExprParser().parseSelectGroupByItem());
if (!(lexer.token() == (Token.COMMA))) {
break;
}
lexer.nextToken();
}
if (lexer.token() == Token.WITH) {
lexer.nextToken();
acceptIdentifier("ROLLUP");
MySqlSelectGroupBy mySqlGroupBy = new MySqlSelectGroupBy();
for (SQLExpr sqlExpr : groupBy.getItems()) {
mySqlGroupBy.addItem(sqlExpr);
}
mySqlGroupBy.setRollUp(true);
groupBy = mySqlGroupBy;
}
}
if (lexer.token() == Token.HAVING) {
lexer.nextToken();
if (groupBy == null) {
groupBy = new SQLSelectGroupByClause();
}
groupBy.setHaving(this.exprParser.expr());
}
queryBlock.setGroupBy(groupBy);
}
protected SQLTableSource parseTableSourceRest(SQLTableSource tableSource) {
if (identifierEquals("USING")) {
return tableSource;
}
if (lexer.token() == Token.USE) {
lexer.nextToken();
MySqlUseIndexHint hint = new MySqlUseIndexHint();
parseIndexHint(hint);
tableSource.getHints().add(hint);
}
if (identifierEquals("IGNORE")) {
lexer.nextToken();
MySqlIgnoreIndexHint hint = new MySqlIgnoreIndexHint();
parseIndexHint(hint);
tableSource.getHints().add(hint);
}
if (identifierEquals("FORCE")) {
lexer.nextToken();
MySqlForceIndexHint hint = new MySqlForceIndexHint();
parseIndexHint(hint);
tableSource.getHints().add(hint);
}
return super.parseTableSourceRest(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);
}
protected MySqlUnionQuery createSQLUnionQuery() {
return new MySqlUnionQuery();
}
public SQLUnionQuery unionRest(SQLUnionQuery union) {
if (lexer.token() == Token.LIMIT) {
MySqlUnionQuery mysqlUnionQuery = (MySqlUnionQuery) union;
mysqlUnionQuery.setLimit(parseLimit());
}
return super.unionRest(union);
}
public Limit parseLimit() {
return ((MySqlExprParser) this.exprParser).parseLimit();
}
public MySqlExprParser getExprParser() {
return (MySqlExprParser) exprParser;
}
}