/*
* 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.sqlserver.parser;
import java.util.Collection;
import java.util.List;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLName;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLDeclareItem;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.expr.SQLIdentifierExpr;
import com.alibaba.druid.sql.ast.expr.SQLQueryExpr;
import com.alibaba.druid.sql.ast.statement.*;
import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerOutput;
import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerTop;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerCommitStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerDeclareStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerExecStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerExecStatement.SQLServerParameter;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerInsertStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerRollbackStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerSetStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerSetTransactionIsolationLevelStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerUpdateStatement;
import com.alibaba.druid.sql.dialect.sqlserver.ast.stmt.SQLServerWaitForStatement;
import com.alibaba.druid.sql.parser.Lexer;
import com.alibaba.druid.sql.parser.ParserException;
import com.alibaba.druid.sql.parser.SQLSelectParser;
import com.alibaba.druid.sql.parser.SQLStatementParser;
import com.alibaba.druid.sql.parser.Token;
public class SQLServerStatementParser extends SQLStatementParser {
public SQLServerStatementParser(String sql){
super(new SQLServerExprParser(sql));
}
public SQLSelectParser createSQLSelectParser() {
return new SQLServerSelectParser(this.exprParser);
}
public SQLServerStatementParser(Lexer lexer){
super(new SQLServerExprParser(lexer));
}
public boolean parseStatementListDialect(List<SQLStatement> statementList) {
if (lexer.token() == Token.WITH) {
SQLStatement stmt = parseSelect();
statementList.add(stmt);
return true;
}
if (identifierEquals("EXEC") || identifierEquals("EXECUTE")) {
lexer.nextToken();
SQLServerExecStatement execStmt = new SQLServerExecStatement();
if (lexer.token() == Token.LPAREN) {
lexer.nextToken();
this.parseExecParameter(execStmt.getParameters(), execStmt);
accept(Token.RPAREN);
} else {
SQLName sqlNameName = this.exprParser.name();
if (lexer.token() == Token.EQ) {
lexer.nextToken();
execStmt.setReturnStatus(sqlNameName);
execStmt.setModuleName(this.exprParser.name());
} else {
execStmt.setModuleName(sqlNameName);
}
this.parseExecParameter(execStmt.getParameters(), execStmt);
}
statementList.add(execStmt);
return true;
}
if (lexer.token() == Token.DECLARE) {
statementList.add(this.parseDeclare());
return true;
}
if (lexer.token() == Token.IF) {
statementList.add(this.parseIf());
return true;
}
if (lexer.token() == Token.BEGIN) {
statementList.add(this.parseBlock());
return true;
}
if (lexer.token() == Token.COMMIT) {
statementList.add(this.parseCommit());
return true;
}
if (identifierEquals("WAITFOR")) {
statementList.add(this.parseWaitFor());
return true;
}
return false;
}
/**
* SQLServer parse Parameter statement support out type
* @author zz [455910092@qq.com]
*/
public void parseExecParameter(Collection<SQLServerParameter> exprCol, SQLObject parent) {
if (lexer.token() == Token.RPAREN || lexer.token() == Token.RBRACKET) {
return;
}
if (lexer.token() == Token.EOF) {
return;
}
SQLServerParameter param = new SQLServerParameter();
SQLExpr expr = this.exprParser.expr();
expr.setParent(parent);
param.setExpr(expr);
if (lexer.token() == Token.OUT) {
param.setType(true);
accept(Token.OUT);
}
exprCol.add(param);
while (lexer.token() == Token.COMMA) {
lexer.nextToken();
param = new SQLServerParameter();
expr = this.exprParser.expr();
expr.setParent(parent);
param.setExpr(expr);
if (lexer.token() == Token.OUT) {
param.setType(true);
accept(Token.OUT);
}
exprCol.add(param);
}
}
public SQLStatement parseDeclare() {
this.accept(Token.DECLARE);
SQLServerDeclareStatement declareStatement = new SQLServerDeclareStatement();
for (;;) {
SQLDeclareItem item = new SQLDeclareItem();
declareStatement.addItem(item);
item.setName(this.exprParser.name());
if (lexer.token() == Token.AS) {
lexer.nextToken();
}
if (lexer.token() == Token.TABLE) {
lexer.nextToken();
item.setType(SQLDeclareItem.Type.TABLE);
if (lexer.token() == Token.LPAREN) {
lexer.nextToken();
for (;;) {
if (lexer.token() == Token.IDENTIFIER //
|| lexer.token() == Token.LITERAL_ALIAS) {
SQLColumnDefinition column = this.exprParser.parseColumn();
item.getTableElementList().add(column);
} else if (lexer.token() == Token.PRIMARY //
|| lexer.token() == Token.UNIQUE //
|| lexer.token() == Token.CHECK //
|| lexer.token() == Token.CONSTRAINT) {
SQLConstraint constraint = this.exprParser.parseConstaint();
constraint.setParent(item);
item.getTableElementList().add((SQLTableElement) constraint);
} else if (lexer.token() == Token.TABLESPACE) {
throw new ParserException("TODO " + lexer.token());
} else {
SQLColumnDefinition column = this.exprParser.parseColumn();
item.getTableElementList().add(column);
}
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
if (lexer.token() == Token.RPAREN) {
break;
}
continue;
}
break;
}
accept(Token.RPAREN);
}
break;
} else if (lexer.token() == Token.CURSOR) {
item.setType(SQLDeclareItem.Type.CURSOR);
lexer.nextToken();
} else {
item.setType(SQLDeclareItem.Type.LOCAL);
item.setDataType(this.exprParser.parseDataType());
if (lexer.token() == Token.EQ) {
lexer.nextToken();
item.setValue(this.exprParser.expr());
}
}
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
} else {
break;
}
}
return declareStatement;
}
public SQLStatement parseInsert() {
SQLServerInsertStatement insertStatement = new SQLServerInsertStatement();
if (lexer.token() == Token.INSERT) {
accept(Token.INSERT);
}
parseInsert0(insertStatement);
return insertStatement;
}
protected void parseInsert0(SQLInsertInto insert, boolean acceptSubQuery) {
SQLServerInsertStatement insertStatement = (SQLServerInsertStatement) insert;
SQLServerTop top = this.getExprParser().parseTop();
if (top != null) {
insertStatement.setTop(top);
}
if (lexer.token() == Token.INTO) {
lexer.nextToken();
}
SQLName tableName = this.exprParser.name();
insertStatement.setTableName(tableName);
if (lexer.token() == Token.LITERAL_ALIAS) {
insertStatement.setAlias(tableAlias());
}
parseInsert0_hinits(insertStatement);
if (lexer.token() == Token.IDENTIFIER && !lexer.stringVal().equalsIgnoreCase("OUTPUT")) {
insertStatement.setAlias(lexer.stringVal());
lexer.nextToken();
}
if (lexer.token() == (Token.LPAREN)) {
lexer.nextToken();
this.exprParser.exprList(insertStatement.getColumns(), insertStatement);
accept(Token.RPAREN);
}
SQLServerOutput output = this.getExprParser().parserOutput();
if (output != null) {
insertStatement.setOutput(output);
}
if (lexer.token() == Token.VALUES) {
lexer.nextToken();
for (;;) {
accept(Token.LPAREN);
SQLInsertStatement.ValuesClause values = new SQLInsertStatement.ValuesClause();
this.exprParser.exprList(values.getValues(), values);
insertStatement.getValuesList().add(values);
accept(Token.RPAREN);
if (!parseCompleteValues && insertStatement.getValuesList().size() >= parseValuesSize) {
lexer.skipToEOF();
break;
}
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
continue;
} else {
break;
}
}
} else if (acceptSubQuery && (lexer.token() == Token.SELECT || lexer.token() == Token.LPAREN)) {
SQLQueryExpr queryExpr = (SQLQueryExpr) this.exprParser.expr();
insertStatement.setQuery(queryExpr.getSubQuery());
} else if (lexer.token() == Token.DEFAULT) {
lexer.nextToken();
accept(Token.VALUES);
insertStatement.setDefaultValues(true);
}
}
protected SQLServerUpdateStatement createUpdateStatement() {
return new SQLServerUpdateStatement();
}
public SQLUpdateStatement parseUpdateStatement() {
SQLServerUpdateStatement udpateStatement = createUpdateStatement();
accept(Token.UPDATE);
SQLServerTop top = this.getExprParser().parseTop();
if (top != null) {
udpateStatement.setTop(top);
}
SQLTableSource tableSource = this.exprParser.createSelectParser().parseTableSource();
udpateStatement.setTableSource(tableSource);
parseUpdateSet(udpateStatement);
SQLServerOutput output = this.getExprParser().parserOutput();
if (output != null) {
udpateStatement.setOutput(output);
}
if (lexer.token() == Token.FROM) {
lexer.nextToken();
SQLTableSource from = this.exprParser.createSelectParser().parseTableSource();
udpateStatement.setFrom(from);
}
if (lexer.token() == (Token.WHERE)) {
lexer.nextToken();
udpateStatement.setWhere(this.exprParser.expr());
}
return udpateStatement;
}
public SQLServerExprParser getExprParser() {
return (SQLServerExprParser) exprParser;
}
public SQLStatement parseSet() {
accept(Token.SET);
if (identifierEquals("TRANSACTION")) {
lexer.nextToken();
acceptIdentifier("ISOLATION");
acceptIdentifier("LEVEL");
SQLServerSetTransactionIsolationLevelStatement stmt = new SQLServerSetTransactionIsolationLevelStatement();
if (identifierEquals("READ")) {
lexer.nextToken();
if (identifierEquals("UNCOMMITTED")) {
stmt.setLevel("READ UNCOMMITTED");
lexer.nextToken();
} else if (identifierEquals("COMMITTED")) {
stmt.setLevel("READ COMMITTED");
lexer.nextToken();
} else {
throw new ParserException("UNKOWN TRANSACTION LEVEL : " + lexer.stringVal());
}
} else if (identifierEquals("SERIALIZABLE")) {
stmt.setLevel("SERIALIZABLE");
lexer.nextToken();
} else if (identifierEquals("SNAPSHOT")) {
stmt.setLevel("SNAPSHOT");
lexer.nextToken();
} else if (identifierEquals("REPEATABLE")) {
lexer.nextToken();
if (identifierEquals("READ")) {
stmt.setLevel("REPEATABLE READ");
lexer.nextToken();
} else {
throw new ParserException("UNKOWN TRANSACTION LEVEL : " + lexer.stringVal());
}
} else {
throw new ParserException("UNKOWN TRANSACTION LEVEL : " + lexer.stringVal());
}
return stmt;
}
if (identifierEquals("STATISTICS")) {
lexer.nextToken();
SQLServerSetStatement stmt = new SQLServerSetStatement();
if (identifierEquals("IO") || identifierEquals("XML") || identifierEquals("PROFILE")
|| identifierEquals("TIME")) {
stmt.getItem().setTarget(new SQLIdentifierExpr("STATISTICS " + lexer.stringVal().toUpperCase()));
lexer.nextToken();
if (lexer.token() == Token.ON) {
stmt.getItem().setValue(new SQLIdentifierExpr("ON"));
lexer.nextToken();
} else if (identifierEquals("OFF")) {
stmt.getItem().setValue(new SQLIdentifierExpr("OFF"));
lexer.nextToken();
}
}
return stmt;
}
if (lexer.token() == Token.VARIANT) {
SQLSetStatement stmt = new SQLSetStatement(getDbType());
parseAssignItems(stmt.getItems(), stmt);
return stmt;
} else {
SQLServerSetStatement stmt = new SQLServerSetStatement();
stmt.getItem().setTarget(this.exprParser.expr());
if (lexer.token() == Token.ON) {
stmt.getItem().setValue(new SQLIdentifierExpr("ON"));
lexer.nextToken();
} else if (identifierEquals("OFF")) {
stmt.getItem().setValue(new SQLIdentifierExpr("OFF"));
lexer.nextToken();
} else {
stmt.getItem().setValue(this.exprParser.expr());
}
return stmt;
}
}
public SQLIfStatement parseIf() {
accept(Token.IF);
SQLIfStatement stmt = new SQLIfStatement();
stmt.setCondition(this.exprParser.expr());
this.parseStatementList(stmt.getStatements(), 1);
if(lexer.token() == Token.SEMI) {
lexer.nextToken();
}
if (lexer.token() == Token.ELSE) {
lexer.nextToken();
SQLIfStatement.Else elseItem = new SQLIfStatement.Else();
this.parseStatementList(elseItem.getStatements(), 1);
stmt.setElseItem(elseItem);
}
return stmt;
}
public SQLStatement parseBlock() {
accept(Token.BEGIN);
if (identifierEquals("TRANSACTION") || identifierEquals("TRAN")) {
lexer.nextToken();
SQLStartTransactionStatement startTrans = new SQLStartTransactionStatement();
if (lexer.token() == Token.IDENTIFIER) {
SQLName name = this.exprParser.name();
startTrans.setName(name);
}
return startTrans;
}
SQLBlockStatement block = new SQLBlockStatement();
parseStatementList(block.getStatementList());
accept(Token.END);
return block;
}
public SQLServerCommitStatement parseCommit() {
acceptIdentifier("COMMIT");
SQLServerCommitStatement stmt = new SQLServerCommitStatement();
if (identifierEquals("WORK")) {
lexer.nextToken();
stmt.setWork(true);
}
if (identifierEquals("TRAN") || identifierEquals("TRANSACTION")) {
lexer.nextToken();
if (lexer.token() == Token.IDENTIFIER || lexer.token() == Token.VARIANT) {
stmt.setTransactionName(this.exprParser.expr());
}
if (lexer.token() == Token.WITH) {
lexer.nextToken();
accept(Token.LPAREN);
acceptIdentifier("DELAYED_DURABILITY");
accept(Token.EQ);
stmt.setDelayedDurability(this.exprParser.expr());
accept(Token.RPAREN);
}
}
return stmt;
}
public SQLServerRollbackStatement parseRollback() {
acceptIdentifier("ROLLBACK");
SQLServerRollbackStatement stmt = new SQLServerRollbackStatement();
if (identifierEquals("WORK")) {
lexer.nextToken();
stmt.setWork(true);
}
if (identifierEquals("TRAN") || identifierEquals("TRANSACTION")) {
lexer.nextToken();
if (lexer.token() == Token.IDENTIFIER || lexer.token() == Token.VARIANT) {
stmt.setName(this.exprParser.expr());
}
}
return stmt;
}
public SQLServerWaitForStatement parseWaitFor() {
acceptIdentifier("WAITFOR");
SQLServerWaitForStatement stmt = new SQLServerWaitForStatement();
if (identifierEquals("DELAY")) {
lexer.nextToken();
stmt.setDelay(this.exprParser.expr());
}
if (identifierEquals("TIME")) {
lexer.nextToken();
stmt.setTime(this.exprParser.expr());
}
if (lexer.token() == Token.COMMA) {
lexer.nextToken();
if (identifierEquals("TIMEOUT")) {
lexer.nextToken();
stmt.setTimeout(this.exprParser.expr());
}
}
return stmt;
}
}