org.mariadb.jdbc.internal.util.dao.ClientPrepareResult Maven / Gradle / Ivy
/*
MariaDB Client for Java
Copyright (c) 2012-2014 Monty Program Ab.
This library is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by the Free
Software Foundation; either version 2.1 of the License, or (at your option)
any later version.
This library 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 Lesser General Public License
for more details.
You should have received a copy of the GNU Lesser General Public License along
with this library; if not, write to Monty Program Ab [email protected].
This particular MariaDB Client for Java file is work
derived from a Drizzle-JDBC. Drizzle-JDBC file which is covered by subject to
the following copyright and notice provisions:
Copyright (c) 2009-2011, Marcus Eriksson
Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list
of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.
Neither the name of the driver nor the names of its contributors may not be
used to endorse or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.
*/
package org.mariadb.jdbc.internal.util.dao;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
public class ClientPrepareResult implements PrepareResult {
private String sql;
private List queryParts;
private boolean isQueryMultiValuesRewritable = true;
private boolean isQueryMultipleRewritable = true;
private boolean rewriteType;
private int paramCount;
private ClientPrepareResult(String sql, List queryParts, boolean isQueryMultiValuesRewritable,
boolean isQueryMultipleRewritable, boolean rewriteType) {
this.sql = sql;
this.queryParts = queryParts;
this.isQueryMultiValuesRewritable = isQueryMultiValuesRewritable;
this.isQueryMultipleRewritable = isQueryMultipleRewritable;
this.paramCount = queryParts.size() - (rewriteType ? 3 : 1);
this.rewriteType = rewriteType;
}
public String getSql() {
return sql;
}
public List getQueryParts() {
return queryParts;
}
public boolean isQueryMultiValuesRewritable() {
return isQueryMultiValuesRewritable;
}
public boolean isQueryMultipleRewritable() {
return isQueryMultipleRewritable;
}
public boolean isRewriteType() {
return rewriteType;
}
public int getParamCount() {
return paramCount;
}
/**
* Separate query in a String list and set flag isQueryMultipleRewritable.
* The resulting string list is separed by ? that are not in comments.
* isQueryMultipleRewritable flag is set if query can be rewrite in one query
* (all case but if using "-- comment").
* example for query :
* "INSERT INTO tableName(id, name) VALUES (?, ?)"
* result list will be :
* {"INSERT INTO tableName(id, name) VALUES (",
* ", ",
* ")"}
*
* @param queryString query
* @param noBackslashEscapes escape mode
* @return ClientPrepareResult
*/
public static ClientPrepareResult createParameterParts(String queryString, boolean noBackslashEscapes) {
try {
boolean reWritablePrepare = false;
boolean multipleQueriesPrepare = true;
List partList = new ArrayList<>();
LexState state = LexState.Normal;
char lastChar = '\0';
boolean endingSemicolon = false;
boolean singleQuotes = false;
int lastParameterPosition = 0;
char[] query = queryString.toCharArray();
int queryLength = query.length;
for (int i = 0; i < queryLength; i++) {
if (state == LexState.Escape) state = LexState.String;
char car = query[i];
switch (car) {
case '*':
if (state == LexState.Normal && lastChar == '/') state = LexState.SlashStarComment;
break;
case '/':
if (state == LexState.SlashStarComment && lastChar == '*') {
state = LexState.Normal;
} else if (state == LexState.Normal && lastChar == '/') {
state = LexState.EOLComment;
}
break;
case '#':
if (state == LexState.Normal) state = LexState.EOLComment;
break;
case '-':
if (state == LexState.Normal && lastChar == '-') {
state = LexState.EOLComment;
multipleQueriesPrepare = false;
}
break;
case '\n':
if (state == LexState.EOLComment) {
multipleQueriesPrepare = true;
state = LexState.Normal;
}
break;
case '"':
if (state == LexState.Normal) {
state = LexState.String;
singleQuotes = false;
} else if (state == LexState.String && !singleQuotes) {
state = LexState.Normal;
}
break;
case '\'':
if (state == LexState.Normal) {
state = LexState.String;
singleQuotes = true;
} else if (state == LexState.String && singleQuotes) {
state = LexState.Normal;
}
break;
case '\\':
if (noBackslashEscapes) {
break;
}
if (state == LexState.String) state = LexState.Escape;
break;
case ';':
if (state == LexState.Normal) {
endingSemicolon = true;
multipleQueriesPrepare = false;
}
break;
case '?':
if (state == LexState.Normal) {
partList.add(queryString.substring(lastParameterPosition, i).getBytes("UTF-8"));
lastParameterPosition = i + 1;
}
break;
case '`':
if (state == LexState.Backtick) {
state = LexState.Normal;
} else if (state == LexState.Normal) {
state = LexState.Backtick;
}
break;
default:
//multiple queries
if (state == LexState.Normal && endingSemicolon && ((byte) car >= 40)) {
endingSemicolon = false;
multipleQueriesPrepare = true;
}
break;
}
lastChar = car;
}
if (lastParameterPosition == 0) {
partList.add(queryString.getBytes("UTF-8"));
} else {
partList.add(queryString.substring(lastParameterPosition, queryLength).getBytes("UTF-8"));
}
return new ClientPrepareResult(queryString, partList, reWritablePrepare, multipleQueriesPrepare, false);
} catch (UnsupportedEncodingException u) {
//cannot happen
return null;
}
}
/**
* Valid that query is valid (no ending semi colon, or end-of line comment ).
*
* @param queryString query
* @param noBackslashEscapes escape
* @return valid flag
*/
public static boolean isRewritableBatch(String queryString, boolean noBackslashEscapes) {
LexState state = LexState.Normal;
char lastChar = '\0';
boolean singleQuotes = false;
boolean endingSemicolon = false;
char[] query = queryString.toCharArray();
int queryLength = query.length;
for (int i = 0; i < queryLength; i++) {
if (state == LexState.Escape) state = LexState.String;
char car = query[i];
switch (car) {
case '*':
if (state == LexState.Normal && lastChar == '/') state = LexState.SlashStarComment;
break;
case '/':
if (state == LexState.SlashStarComment && lastChar == '*') {
state = LexState.Normal;
} else if (state == LexState.Normal && lastChar == '/') {
state = LexState.EOLComment;
}
break;
case '#':
if (state == LexState.Normal) state = LexState.EOLComment;
break;
case '-':
if (state == LexState.Normal && lastChar == '-') {
state = LexState.EOLComment;
}
break;
case ';':
if (state == LexState.Normal) {
endingSemicolon = true;
}
break;
case '\n':
if (state == LexState.EOLComment) {
state = LexState.Normal;
}
break;
case '"':
if (state == LexState.Normal) {
state = LexState.String;
singleQuotes = false;
} else if (state == LexState.String && !singleQuotes) {
state = LexState.Normal;
}
break;
case '\'':
if (state == LexState.Normal) {
state = LexState.String;
singleQuotes = true;
} else if (state == LexState.String && singleQuotes) {
state = LexState.Normal;
}
break;
case '\\':
if (noBackslashEscapes) {
break;
}
if (state == LexState.String) state = LexState.Escape;
break;
case '`':
if (state == LexState.Backtick) {
state = LexState.Normal;
} else if (state == LexState.Normal) {
state = LexState.Backtick;
}
break;
default:
//multiple queries
if (state == LexState.Normal && endingSemicolon && ((byte) car >= 40)) {
endingSemicolon = false;
}
break;
}
lastChar = car;
}
return state != LexState.EOLComment && !endingSemicolon;
}
/**
* Separate query in a String list and set flag isQueryMultiValuesRewritable
* The parameters "?" (not in comments) emplacements are to be known.
*
* The only rewritten queries follow these notation:
* INSERT [LOW_PRIORITY | DELAYED | HIGH_PRIORITY] [IGNORE] [INTO] tbl_name [PARTITION (partition_list)] [(col,...)]
* {VALUES | VALUE} (...) [ ON DUPLICATE KEY UPDATE col=expr [, col=expr] ... ]
* With expr without parameter.
*
* INSERT ... SELECT will not be rewritten.
*
* String list :
*
* - pre value part
* - After value and first parameter part
* - for each parameters :
* - part after parameter and before last parenthesis
* - Last query part
*
* example : INSERT INTO TABLE(col1,col2,col3,col4, col5) VALUES (9, ?, 5, ?, 8) ON DUPLICATE KEY UPDATE col2=col2+10
*
* - pre value part : INSERT INTO TABLE(col1,col2,col3,col4, col5) VALUES
* - after value part : " (9 "
* - part after parameter 1: ", 5,"
* - ", 5,"
* - ",8)"
* - last part : ON DUPLICATE KEY UPDATE col2=col2+10
*
* With 2 series of parameters, this query will be rewritten like
* [INSERT INTO TABLE(col1,col2,col3,col4, col5) VALUES][ (9, param0_1, 5, param0_2, 8)][, (9, param1_1, 5, param1_2, 8)][ ON DUPLICATE
* KEY UPDATE col2=col2+10]
*
* @param queryString query String
* @param noBackslashEscapes must backslash be escaped.
* @return List of query part.
*/
public static ClientPrepareResult createRewritableParts(String queryString, boolean noBackslashEscapes) {
try {
boolean reWritablePrepare = true;
boolean multipleQueriesPrepare = true;
List partList = new ArrayList<>();
LexState state = LexState.Normal;
char lastChar = '\0';
StringBuilder sb = new StringBuilder();
String preValuePart1 = null;
String preValuePart2 = null;
String postValuePart = null;
boolean singleQuotes = false;
int isInParenthesis = 0;
boolean skipChar = false;
boolean isFirstChar = true;
boolean isInsert = false;
boolean semicolon = false;
boolean hasParam = false;
char[] query = queryString.toCharArray();
int queryLength = query.length;
for (int i = 0; i < queryLength; i++) {
if (state == LexState.Escape) {
sb.append(query[i]);
state = LexState.String;
continue;
}
char car = query[i];
switch (car) {
case '*':
if (state == LexState.Normal && lastChar == '/') state = LexState.SlashStarComment;
break;
case '/':
if (state == LexState.SlashStarComment && lastChar == '*') {
state = LexState.Normal;
} else if (state == LexState.Normal && lastChar == '/') {
state = LexState.EOLComment;
}
break;
case '#':
if (state == LexState.Normal) state = LexState.EOLComment;
break;
case '-':
if (state == LexState.Normal && lastChar == '-') {
state = LexState.EOLComment;
multipleQueriesPrepare = false;
}
break;
case '\n':
if (state == LexState.EOLComment) state = LexState.Normal;
break;
case '"':
if (state == LexState.Normal) {
state = LexState.String;
singleQuotes = false;
} else if (state == LexState.String && !singleQuotes) {
state = LexState.Normal;
}
break;
case ';':
if (state == LexState.Normal) {
semicolon = true;
multipleQueriesPrepare = false;
}
break;
case '\'':
if (state == LexState.Normal) {
state = LexState.String;
singleQuotes = true;
} else if (state == LexState.String && singleQuotes) {
state = LexState.Normal;
}
break;
case '\\':
if (noBackslashEscapes) {
break;
}
if (state == LexState.String) state = LexState.Escape;
break;
case '?':
if (state == LexState.Normal) {
hasParam = true;
if (preValuePart1 == null) {
preValuePart1 = sb.toString();
sb.setLength(0);
}
if (preValuePart2 == null) {
preValuePart2 = sb.toString();
sb.setLength(0);
} else {
if (postValuePart != null) {
//having parameters after the last ")" of value is not rewritable
reWritablePrepare = false;
//add part
sb.insert(0, postValuePart);
postValuePart = null;
}
partList.add(sb.toString().getBytes("UTF-8"));
sb.setLength(0);
}
skipChar = true;
}
break;
case '`':
if (state == LexState.Backtick) {
state = LexState.Normal;
} else if (state == LexState.Normal) {
state = LexState.Backtick;
}
break;
case 's':
case 'S':
if (state == LexState.Normal) {
if (postValuePart == null
&& queryLength > i + 6
&& (query[i + 1] == 'e' || query[i + 1] == 'E')
&& (query[i + 2] == 'l' || query[i + 2] == 'L')
&& (query[i + 3] == 'e' || query[i + 3] == 'E')
&& (query[i + 4] == 'c' || query[i + 4] == 'C')
&& (query[i + 5] == 't' || query[i + 5] == 'T')) {
//SELECT queries, INSERT FROM SELECT not rewritable
reWritablePrepare = false;
}
}
break;
case 'v':
case 'V':
if (state == LexState.Normal) {
if (preValuePart1 == null
&& (lastChar == ')' || ((byte) lastChar <= 40))
&& queryLength > i + 7
&& (query[i + 1] == 'a' || query[i + 1] == 'A')
&& (query[i + 2] == 'l' || query[i + 2] == 'L')
&& (query[i + 3] == 'u' || query[i + 3] == 'U')
&& (query[i + 4] == 'e' || query[i + 4] == 'E')
&& (query[i + 5] == 's' || query[i + 5] == 'S')
&& (query[i + 6] == '(' || ((byte) query[i + 6] <= 40))) {
sb.append(car);
sb.append(query[i + 1]);
sb.append(query[i + 2]);
sb.append(query[i + 3]);
sb.append(query[i + 4]);
sb.append(query[i + 5]);
i = i + 5;
preValuePart1 = sb.toString();
sb.setLength(0);
skipChar = true;
}
}
break;
case '(':
if (state == LexState.Normal) isInParenthesis++;
break;
case ')':
if (state == LexState.Normal) {
isInParenthesis--;
if (isInParenthesis == 0 && preValuePart2 != null && postValuePart == null) {
sb.append(car);
postValuePart = sb.toString();
sb.setLength(0);
skipChar = true;
}
}
break;
default:
if (state == LexState.Normal && isFirstChar && ((byte) car >= 40)) {
if (car == 'I' || car == 'i') isInsert = true;
isFirstChar = false;
}
//multiple queries
if (state == LexState.Normal && semicolon && ((byte) car >= 40)) {
reWritablePrepare = false;
multipleQueriesPrepare = true;
}
break;
}
lastChar = car;
if (skipChar) {
skipChar = false;
} else {
sb.append(car);
}
}
if (!hasParam) {
//permit to have rewrite without parameter
if (preValuePart1 == null) {
partList.add(0, sb.toString().getBytes("UTF-8"));
partList.add(1, new byte[0]);
} else {
partList.add(0, preValuePart1.getBytes("UTF-8"));
partList.add(1, sb.toString().getBytes("UTF-8"));
}
sb.setLength(0);
} else {
partList.add(0, (preValuePart1 == null) ? new byte[0] : preValuePart1.getBytes("UTF-8"));
partList.add(1, (preValuePart2 == null) ? new byte[0] : preValuePart2.getBytes("UTF-8"));
}
if (!isInsert) reWritablePrepare = false;
//postValuePart is the value after the last parameter and parenthesis
//if no param, don't add to the list.
if (hasParam) partList.add((postValuePart == null) ? new byte[0] : postValuePart.getBytes("UTF-8"));
partList.add(sb.toString().getBytes("UTF-8"));
return new ClientPrepareResult(queryString, partList, reWritablePrepare, multipleQueriesPrepare, true);
} catch (UnsupportedEncodingException u) {
//cannot happen
return null;
}
}
enum LexState {
Normal, /* inside query */
String, /* inside string */
SlashStarComment, /* inside slash-star comment */
Escape, /* found backslash */
Parameter, /* parameter placeholder found */
EOLComment, /* # comment, or // comment, or -- comment */
Backtick /* found backtick */
}
}
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