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dble/src/main/java/io/mycat/server/parser/ServerParse.java

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/*
* Copyright (c) 2013, OpenCloudDB/MyCAT and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software;Designed and Developed mainly by many Chinese
* opensource volunteers. you can redistribute it and/or modify it under the
* terms of the GNU General Public License version 2 only, as published by the
* Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Any questions about this component can be directed to it's project Web address
* https://code.google.com/p/opencloudb/.
*
*/
package io.mycat.server.parser;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import io.mycat.config.Versions;
import io.mycat.route.parser.util.ParseUtil;
/**
* @author mycat
*/
public final class ServerParse {
public static final int OTHER = -1;
public static final int BEGIN = 1;
public static final int COMMIT = 2;
public static final int DELETE = 3;
public static final int INSERT = 4;
public static final int REPLACE = 5;
public static final int ROLLBACK = 6;
public static final int SELECT = 7;
public static final int SET = 8;
public static final int SHOW = 9;
public static final int START = 10;
public static final int UPDATE = 11;
public static final int KILL = 12;
public static final int SAVEPOINT = 13;
public static final int USE = 14;
public static final int EXPLAIN = 15;
public static final int EXPLAIN2 = 151;
public static final int KILL_QUERY = 16;
public static final int HELP = 17;
public static final int MYSQL_CMD_COMMENT = 18;
public static final int MYSQL_COMMENT = 19;
public static final int CALL = 20;
public static final int DESCRIBE = 21;
public static final int LOCK = 22;
public static final int UNLOCK = 23;
public static final int LOAD_DATA_INFILE_SQL = 99;
public static final int DDL = 100;
public static final int MIGRATE = 203;
private static final Pattern pattern = Pattern.compile("(load)+\\s+(data)+\\s+\\w*\\s*(infile)+",Pattern.CASE_INSENSITIVE);
private static final Pattern callPattern = Pattern.compile("\\w*\\;\\s*\\s*(call)+\\s+\\w*\\s*",Pattern.CASE_INSENSITIVE);
public static int parse(String stmt) {
int length = stmt.length();
//FIX BUG FOR SQL SUCH AS /XXXX/SQL
int rt = -1;
for (int i = 0; i < length; ++i) {
switch (stmt.charAt(i)) {
case ' ':
case '\t':
case '\r':
case '\n':
continue;
case '/':
// such as /*!40101 SET character_set_client = @saved_cs_client
// */;
if (i == 0 && stmt.charAt(1) == '*' && stmt.charAt(2) == '!' && stmt.charAt(length - 2) == '*'
&& stmt.charAt(length - 1) == '/') {
return MYSQL_CMD_COMMENT;
}
case '#':
i = ParseUtil.comment(stmt, i);
if (i + 1 == length) {
return MYSQL_COMMENT;
}
continue;
case 'A':
case 'a':
rt = aCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'B':
case 'b':
rt = beginCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'C':
case 'c':
rt = commitOrCallCheckOrCreate(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'D':
case 'd':
rt = deleteOrdCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'E':
case 'e':
rt = explainCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'I':
case 'i':
rt = insertCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'M':
case 'm':
rt = migrateCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'R':
case 'r':
rt = rCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'S':
case 's':
rt = sCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'T':
case 't':
rt = tCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'U':
case 'u':
rt = uCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'K':
case 'k':
rt = killCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'H':
case 'h':
rt = helpCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
case 'L':
case 'l':
rt = lCheck(stmt, i);
if (rt != OTHER) {
return rt;
}
continue;
default:
continue;
}
}
return OTHER;
}
static int lCheck(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
if ((c1 == 'O' || c1 == 'o') && (c2 == 'A' || c2 == 'a')
&& (c3 == 'D' || c3 == 'd')) {
Matcher matcher = pattern.matcher(stmt);
return matcher.find() ? LOAD_DATA_INFILE_SQL : OTHER;
} else if ((c1 == 'O' || c1 == 'o') && (c2 == 'C' || c2 == 'c')
&& (c3 == 'K' || c3 == 'k')){
return LOCK;
}
}
return OTHER;
}
private static int migrateCheck(String stmt, int offset) {
if (stmt.length() > offset + 7) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
if ((c1 == 'i' || c1 == 'I')
&& (c2 == 'g' || c2 == 'G')
&& (c3 == 'r' || c3 == 'R')
&& (c4 == 'a' || c4 == 'A')
&& (c5 == 't' || c5 == 'T')
&& (c6 == 'e' || c6 == 'E'))
{
return MIGRATE;
}
}
return OTHER;
}
//truncate
private static int tCheck(String stmt, int offset) {
if (stmt.length() > offset + 7) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
char c7 = stmt.charAt(++offset);
char c8 = stmt.charAt(++offset);
if ((c1 == 'R' || c1 == 'r')
&& (c2 == 'U' || c2 == 'u')
&& (c3 == 'N' || c3 == 'n')
&& (c4 == 'C' || c4 == 'c')
&& (c5 == 'A' || c5 == 'a')
&& (c6 == 'T' || c6 == 't')
&& (c7 == 'E' || c7 == 'e')
&& (c8 == ' ' || c8 == '\t' || c8 == '\r' || c8 == '\n')) {
return DDL;
}
}
return OTHER;
}
//alter table/view/...
private static int aCheck(String stmt, int offset) {
if (stmt.length() > offset + 4) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
if ((c1 == 'L' || c1 == 'l')
&& (c2 == 'T' || c2 == 't')
&& (c3 == 'E' || c3 == 'e')
&& (c4 == 'R' || c4 == 'r')
&& (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
return DDL;
}
}
return OTHER;
}
//create table/view/...
private static int createCheck(String stmt, int offset) {
if (stmt.length() > offset + 5) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
if ((c1 == 'R' || c1 == 'r')
&& (c2 == 'E' || c2 == 'e')
&& (c3 == 'A' || c3 == 'a')
&& (c4 == 'T' || c4 == 't')
&& (c5 == 'E' || c5 == 'e')
&& (c6 == ' ' || c6 == '\t' || c6 == '\r' || c6 == '\n')) {
return DDL;
}
}
return OTHER;
}
//drop
private static int dropCheck(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'R' || c1 == 'r')
&& (c2 == 'O' || c2 == 'o')
&& (c3 == 'P' || c3 == 'p')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n')) {
return DDL;
}
}
return OTHER;
}
// delete or drop
static int deleteOrdCheck(String stmt, int offset){
int sqlType = OTHER;
switch (stmt.charAt((offset + 1))) {
case 'E':
case 'e':
sqlType = dCheck(stmt, offset);
break;
case 'R':
case 'r':
sqlType = dropCheck(stmt, offset);
break;
default:
sqlType = OTHER;
}
return sqlType;
}
// HELP' '
static int helpCheck(String stmt, int offset) {
if (stmt.length() > offset + "ELP ".length()) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e') && (c2 == 'L' || c2 == 'l')
&& (c3 == 'P' || c3 == 'p')) {
return (offset << 8) | HELP;
}
}
return OTHER;
}
// EXPLAIN' '
static int explainCheck(String stmt, int offset) {
if (stmt.length() > offset + "XPLAIN ".length()) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
char c7 = stmt.charAt(++offset);
if ((c1 == 'X' || c1 == 'x') && (c2 == 'P' || c2 == 'p')
&& (c3 == 'L' || c3 == 'l') && (c4 == 'A' || c4 == 'a')
&& (c5 == 'I' || c5 == 'i') && (c6 == 'N' || c6 == 'n')
&& (c7 == ' ' || c7 == '\t' || c7 == '\r' || c7 == '\n')) {
return (offset << 8) | EXPLAIN;
}
}
if(stmt != null && stmt.toLowerCase().startsWith("explain2")){
return (offset << 8) | EXPLAIN2;
}
return OTHER;
}
// KILL' '
static int killCheck(String stmt, int offset) {
if (stmt.length() > offset + "ILL ".length()) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'I' || c1 == 'i') && (c2 == 'L' || c2 == 'l')
&& (c3 == 'L' || c3 == 'l')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
case '\t':
case '\r':
case '\n':
continue;
case 'Q':
case 'q':
return killQueryCheck(stmt, offset);
default:
return (offset << 8) | KILL;
}
}
return OTHER;
}
}
return OTHER;
}
// KILL QUERY' '
static int killQueryCheck(String stmt, int offset) {
if (stmt.length() > offset + "UERY ".length()) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
if ((c1 == 'U' || c1 == 'u') && (c2 == 'E' || c2 == 'e')
&& (c3 == 'R' || c3 == 'r') && (c4 == 'Y' || c4 == 'y')
&& (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
while (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case ' ':
case '\t':
case '\r':
case '\n':
continue;
default:
return (offset << 8) | KILL_QUERY;
}
}
return OTHER;
}
}
return OTHER;
}
// BEGIN
static int beginCheck(String stmt, int offset) {
if (stmt.length() > offset + 4) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e')
&& (c2 == 'G' || c2 == 'g')
&& (c3 == 'I' || c3 == 'i')
&& (c4 == 'N' || c4 == 'n')
&& (stmt.length() == ++offset || ParseUtil.isEOF(stmt
.charAt(offset)))) {
return BEGIN;
}
}
return OTHER;
}
// COMMIT
static int commitCheck(String stmt, int offset) {
if (stmt.length() > offset + 5) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
if ((c1 == 'O' || c1 == 'o')
&& (c2 == 'M' || c2 == 'm')
&& (c3 == 'M' || c3 == 'm')
&& (c4 == 'I' || c4 == 'i')
&& (c5 == 'T' || c5 == 't')
&& (stmt.length() == ++offset || ParseUtil.isEOF(stmt
.charAt(offset)))) {
return COMMIT;
}
}
return OTHER;
}
// CALL
static int callCheck(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
if ((c1 == 'A' || c1 == 'a') && (c2 == 'L' || c2 == 'l')
&& (c3 == 'L' || c3 == 'l')) {
return CALL;
}
}
return OTHER;
}
static int commitOrCallCheckOrCreate(String stmt, int offset) {
int sqlType = OTHER;
switch (stmt.charAt((offset + 1))) {
case 'O':
case 'o':
sqlType = commitCheck(stmt, offset);
break;
case 'A':
case 'a':
sqlType = callCheck(stmt, offset);
break;
case 'R':
case 'r':
sqlType = createCheck(stmt, offset);
break;
default:
sqlType = OTHER;
}
return sqlType;
}
// DESCRIBE or desc or DELETE' '
static int dCheck(String stmt, int offset) {
if (stmt.length() > offset + 4) {
int res = describeCheck(stmt, offset);
if (res == DESCRIBE) {
return res;
}
}
// continue check
if (stmt.length() > offset + 6) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e') && (c2 == 'L' || c2 == 'l')
&& (c3 == 'E' || c3 == 'e') && (c4 == 'T' || c4 == 't')
&& (c5 == 'E' || c5 == 'e')
&& (c6 == ' ' || c6 == '\t' || c6 == '\r' || c6 == '\n')) {
return DELETE;
}
}
return OTHER;
}
// DESCRIBE' ' 或 desc' '
static int describeCheck(String stmt, int offset) {
//desc
if (stmt.length() > offset + 4) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e') && (c2 == 'S' || c2 == 's')
&& (c3 == 'C' || c3 == 'c')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n')) {
return DESCRIBE;
}
//describe
if (stmt.length() > offset + 4) {
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
char c7 = stmt.charAt(++offset);
char c8 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e') && (c2 == 'S' || c2 == 's')
&& (c3 == 'C' || c3 == 'c') && (c4 == 'R' || c4 == 'r')
&& (c5 == 'I' || c5 == 'i') && (c6 == 'B' || c6 == 'b')
&& (c7 == 'E' || c7 == 'e')
&& (c8 == ' ' || c8 == '\t' || c8 == '\r' || c8 == '\n')) {
return DESCRIBE;
}
}
}
return OTHER;
}
// INSERT' '
static int insertCheck(String stmt, int offset) {
if (stmt.length() > offset + 6) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
if ((c1 == 'N' || c1 == 'n') && (c2 == 'S' || c2 == 's')
&& (c3 == 'E' || c3 == 'e') && (c4 == 'R' || c4 == 'r')
&& (c5 == 'T' || c5 == 't')
&& (c6 == ' ' || c6 == '\t' || c6 == '\r' || c6 == '\n')) {
return INSERT;
}
}
return OTHER;
}
static int rCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'E':
case 'e':
return replaceCheck(stmt, offset);
case 'O':
case 'o':
return rollabckCheck(stmt, offset);
default:
return OTHER;
}
}
return OTHER;
}
// REPLACE' '
static int replaceCheck(String stmt, int offset) {
if (stmt.length() > offset + 6) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
if ((c1 == 'P' || c1 == 'p') && (c2 == 'L' || c2 == 'l')
&& (c3 == 'A' || c3 == 'a') && (c4 == 'C' || c4 == 'c')
&& (c5 == 'E' || c5 == 'e')
&& (c6 == ' ' || c6 == '\t' || c6 == '\r' || c6 == '\n')) {
return REPLACE;
}
}
return OTHER;
}
// ROLLBACK
static int rollabckCheck(String stmt, int offset) {
if (stmt.length() > offset + 6) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
if ((c1 == 'L' || c1 == 'l')
&& (c2 == 'L' || c2 == 'l')
&& (c3 == 'B' || c3 == 'b')
&& (c4 == 'A' || c4 == 'a')
&& (c5 == 'C' || c5 == 'c')
&& (c6 == 'K' || c6 == 'k')
&& (stmt.length() == ++offset || ParseUtil.isEOF(stmt
.charAt(offset)))) {
return ROLLBACK;
}
}
return OTHER;
}
static int sCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'A':
case 'a':
return savepointCheck(stmt, offset);
case 'E':
case 'e':
return seCheck(stmt, offset);
case 'H':
case 'h':
return showCheck(stmt, offset);
case 'T':
case 't':
return startCheck(stmt, offset);
default:
return OTHER;
}
}
return OTHER;
}
// SAVEPOINT
static int savepointCheck(String stmt, int offset) {
if (stmt.length() > offset + 8) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
char c6 = stmt.charAt(++offset);
char c7 = stmt.charAt(++offset);
char c8 = stmt.charAt(++offset);
if ((c1 == 'V' || c1 == 'v') && (c2 == 'E' || c2 == 'e')
&& (c3 == 'P' || c3 == 'p') && (c4 == 'O' || c4 == 'o')
&& (c5 == 'I' || c5 == 'i') && (c6 == 'N' || c6 == 'n')
&& (c7 == 'T' || c7 == 't')
&& (c8 == ' ' || c8 == '\t' || c8 == '\r' || c8 == '\n')) {
return SAVEPOINT;
}
}
return OTHER;
}
static int seCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'L':
case 'l':
return selectCheck(stmt, offset);
case 'T':
case 't':
if (stmt.length() > ++offset) {
//支持一下语句
// /*!mycat: sql=SELECT * FROM test where id=99 */set @pin=1;
// call p_test(@pin,@pout);
// select @pout;
if(stmt.startsWith("/*!"+ Versions.ANNOTATION_NAME)||stmt.startsWith("/*#"+ Versions.ANNOTATION_NAME)||stmt.startsWith("/*"+ Versions.ANNOTATION_NAME))
{
Matcher matcher = callPattern.matcher(stmt);
if (matcher.find()) {
return CALL;
}
}
char c = stmt.charAt(offset);
if (c == ' ' || c == '\r' || c == '\n' || c == '\t'
|| c == '/' || c == '#') {
return (offset << 8) | SET;
}
}
return OTHER;
default:
return OTHER;
}
}
return OTHER;
}
// SELECT' '
static int selectCheck(String stmt, int offset) {
if (stmt.length() > offset + 4) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e')
&& (c2 == 'C' || c2 == 'c')
&& (c3 == 'T' || c3 == 't')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n'
|| c4 == '/' || c4 == '#')) {
return (offset << 8) | SELECT;
}
}
return OTHER;
}
// SHOW' '
static int showCheck(String stmt, int offset) {
if (stmt.length() > offset + 3) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
if ((c1 == 'O' || c1 == 'o') && (c2 == 'W' || c2 == 'w')
&& (c3 == ' ' || c3 == '\t' || c3 == '\r' || c3 == '\n')) {
return (offset << 8) | SHOW;
}
}
return OTHER;
}
// START' '
static int startCheck(String stmt, int offset) {
if (stmt.length() > offset + 4) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
if ((c1 == 'A' || c1 == 'a') && (c2 == 'R' || c2 == 'r')
&& (c3 == 'T' || c3 == 't')
&& (c4 == ' ' || c4 == '\t' || c4 == '\r' || c4 == '\n')) {
return (offset << 8) | START;
}
}
return OTHER;
}
// UPDATE' ' | USE' '
static int uCheck(String stmt, int offset) {
if (stmt.length() > ++offset) {
switch (stmt.charAt(offset)) {
case 'P':
case 'p':
if (stmt.length() > offset + 5) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
if ((c1 == 'D' || c1 == 'd')
&& (c2 == 'A' || c2 == 'a')
&& (c3 == 'T' || c3 == 't')
&& (c4 == 'E' || c4 == 'e')
&& (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
return UPDATE;
}
}
break;
case 'S':
case 's':
if (stmt.length() > offset + 2) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
if ((c1 == 'E' || c1 == 'e')
&& (c2 == ' ' || c2 == '\t' || c2 == '\r' || c2 == '\n')) {
return (offset << 8) | USE;
}
}
break;
case 'N':
case 'n':
if (stmt.length() > offset + 5) {
char c1 = stmt.charAt(++offset);
char c2 = stmt.charAt(++offset);
char c3 = stmt.charAt(++offset);
char c4 = stmt.charAt(++offset);
char c5 = stmt.charAt(++offset);
if ((c1 == 'L' || c1 == 'l')
&& (c2 == 'O' || c2 == 'o')
&& (c3 == 'C' || c3 == 'c')
&& (c4 == 'K' || c4 == 'k')
&& (c5 == ' ' || c5 == '\t' || c5 == '\r' || c5 == '\n')) {
return UNLOCK;
}
}
break;
default:
return OTHER;
}
}
return OTHER;
}
}
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