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/*
* Copyright (c) 2017, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program 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 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import com.mysql.cj.conf.PropertyKey;
import com.mysql.cj.exceptions.ExceptionFactory;
import com.mysql.cj.exceptions.WrongArgumentException;
import com.mysql.cj.util.StringUtils;
/**
* Represents the "parsed" state of a prepared query, with the statement broken up into its static and dynamic (where parameters are bound) parts.
*/
public class ParseInfo {
protected static final String[] ON_DUPLICATE_KEY_UPDATE_CLAUSE = new String[] { "ON", "DUPLICATE", "KEY", "UPDATE" };
private char firstStmtChar = 0;
private boolean foundLoadData = false;
long lastUsed = 0;
int statementLength = 0;
int statementStartPos = 0;
boolean canRewriteAsMultiValueInsert = false;
byte[][] staticSql = null;
boolean hasPlaceholders = false;
public int numberOfQueries = 1;
boolean isOnDuplicateKeyUpdate = false;
int locationOfOnDuplicateKeyUpdate = -1;
String valuesClause;
boolean parametersInDuplicateKeyClause = false;
String charEncoding;
private ParseInfo batchHead;
private ParseInfo batchValues;
private ParseInfo batchODKUClause;
private ParseInfo(byte[][] staticSql, char firstStmtChar, boolean foundLoadData, boolean isOnDuplicateKeyUpdate, int locationOfOnDuplicateKeyUpdate,
int statementLength, int statementStartPos) {
this.firstStmtChar = firstStmtChar;
this.foundLoadData = foundLoadData;
this.isOnDuplicateKeyUpdate = isOnDuplicateKeyUpdate;
this.locationOfOnDuplicateKeyUpdate = locationOfOnDuplicateKeyUpdate;
this.statementLength = statementLength;
this.statementStartPos = statementStartPos;
this.staticSql = staticSql;
}
public ParseInfo(String sql, Session session, String encoding) {
this(sql, session, encoding, true);
}
public ParseInfo(String sql, Session session, String encoding, boolean buildRewriteInfo) {
try {
if (sql == null) {
throw ExceptionFactory.createException(WrongArgumentException.class, Messages.getString("PreparedStatement.61"),
session.getExceptionInterceptor());
}
this.charEncoding = encoding;
this.lastUsed = System.currentTimeMillis();
String quotedIdentifierString = session.getIdentifierQuoteString();
char quotedIdentifierChar = 0;
if ((quotedIdentifierString != null) && !quotedIdentifierString.equals(" ") && (quotedIdentifierString.length() > 0)) {
quotedIdentifierChar = quotedIdentifierString.charAt(0);
}
this.statementLength = sql.length();
ArrayList endpointList = new ArrayList<>();
boolean inQuotes = false;
char quoteChar = 0;
boolean inQuotedId = false;
int lastParmEnd = 0;
int i;
boolean noBackslashEscapes = session.getServerSession().isNoBackslashEscapesSet();
// we're not trying to be real pedantic here, but we'd like to skip comments at the beginning of statements, as frameworks such as Hibernate
// use them to aid in debugging
this.statementStartPos = findStartOfStatement(sql);
for (i = this.statementStartPos; i < this.statementLength; ++i) {
char c = sql.charAt(i);
if ((this.firstStmtChar == 0) && Character.isLetter(c)) {
// Determine what kind of statement we're doing (_S_elect, _I_nsert, etc.)
this.firstStmtChar = Character.toUpperCase(c);
// no need to search for "ON DUPLICATE KEY UPDATE" if not an INSERT statement
if (this.firstStmtChar == 'I') {
this.locationOfOnDuplicateKeyUpdate = getOnDuplicateKeyLocation(sql,
session.getPropertySet().getBooleanProperty(PropertyKey.dontCheckOnDuplicateKeyUpdateInSQL).getValue(),
session.getPropertySet().getBooleanProperty(PropertyKey.rewriteBatchedStatements).getValue(),
session.getServerSession().isNoBackslashEscapesSet());
this.isOnDuplicateKeyUpdate = this.locationOfOnDuplicateKeyUpdate != -1;
}
}
if (!noBackslashEscapes && c == '\\' && i < (this.statementLength - 1)) {
i++;
continue; // next character is escaped
}
// are we in a quoted identifier? (only valid when the id is not inside a 'string')
if (!inQuotes && (quotedIdentifierChar != 0) && (c == quotedIdentifierChar)) {
inQuotedId = !inQuotedId;
} else if (!inQuotedId) {
// only respect quotes when not in a quoted identifier
if (inQuotes) {
if (((c == '\'') || (c == '"')) && c == quoteChar) {
if (i < (this.statementLength - 1) && sql.charAt(i + 1) == quoteChar) {
i++;
continue; // inline quote escape
}
inQuotes = !inQuotes;
quoteChar = 0;
} else if (((c == '\'') || (c == '"')) && c == quoteChar) {
inQuotes = !inQuotes;
quoteChar = 0;
}
} else {
if (c == '#' || (c == '-' && (i + 1) < this.statementLength && sql.charAt(i + 1) == '-')) {
// run out to end of statement, or newline, whichever comes first
int endOfStmt = this.statementLength - 1;
for (; i < endOfStmt; i++) {
c = sql.charAt(i);
if (c == '\r' || c == '\n') {
break;
}
}
continue;
} else if (c == '/' && (i + 1) < this.statementLength) {
// Comment?
char cNext = sql.charAt(i + 1);
if (cNext == '*') {
i += 2;
for (int j = i; j < this.statementLength; j++) {
i++;
cNext = sql.charAt(j);
if (cNext == '*' && (j + 1) < this.statementLength) {
if (sql.charAt(j + 1) == '/') {
i++;
if (i < this.statementLength) {
c = sql.charAt(i);
}
break; // comment done
}
}
}
}
} else if ((c == '\'') || (c == '"')) {
inQuotes = true;
quoteChar = c;
}
}
}
if (!inQuotes && !inQuotedId) {
if ((c == '?')) {
endpointList.add(new int[] { lastParmEnd, i });
lastParmEnd = i + 1;
if (this.isOnDuplicateKeyUpdate && i > this.locationOfOnDuplicateKeyUpdate) {
this.parametersInDuplicateKeyClause = true;
}
} else if (c == ';') {
int j = i + 1;
if (j < this.statementLength) {
for (; j < this.statementLength; j++) {
if (!Character.isWhitespace(sql.charAt(j))) {
break;
}
}
if (j < this.statementLength) {
this.numberOfQueries++;
}
i = j - 1;
}
}
}
}
if (this.firstStmtChar == 'L') {
if (StringUtils.startsWithIgnoreCaseAndWs(sql, "LOAD DATA")) {
this.foundLoadData = true;
} else {
this.foundLoadData = false;
}
} else {
this.foundLoadData = false;
}
endpointList.add(new int[] { lastParmEnd, this.statementLength });
this.staticSql = new byte[endpointList.size()][];
this.hasPlaceholders = this.staticSql.length > 1;
for (i = 0; i < this.staticSql.length; i++) {
int[] ep = endpointList.get(i);
int end = ep[1];
int begin = ep[0];
int len = end - begin;
if (this.foundLoadData) {
this.staticSql[i] = StringUtils.getBytes(sql, begin, len);
} else if (encoding == null) {
byte[] buf = new byte[len];
for (int j = 0; j < len; j++) {
buf[j] = (byte) sql.charAt(begin + j);
}
this.staticSql[i] = buf;
} else {
this.staticSql[i] = StringUtils.getBytes(sql, begin, len, encoding);
}
}
} catch (StringIndexOutOfBoundsException oobEx) {
throw ExceptionFactory.createException(WrongArgumentException.class, Messages.getString("PreparedStatement.62", new Object[] { sql }), oobEx,
session.getExceptionInterceptor());
}
if (buildRewriteInfo) {
this.canRewriteAsMultiValueInsert = this.numberOfQueries == 1 && !this.parametersInDuplicateKeyClause
&& canRewrite(sql, this.isOnDuplicateKeyUpdate, this.locationOfOnDuplicateKeyUpdate, this.statementStartPos);
if (this.canRewriteAsMultiValueInsert && session.getPropertySet().getBooleanProperty(PropertyKey.rewriteBatchedStatements).getValue()) {
buildRewriteBatchedParams(sql, session, encoding);
}
}
}
public byte[][] getStaticSql() {
return this.staticSql;
}
public String getValuesClause() {
return this.valuesClause;
}
public int getLocationOfOnDuplicateKeyUpdate() {
return this.locationOfOnDuplicateKeyUpdate;
}
public boolean canRewriteAsMultiValueInsertAtSqlLevel() {
return this.canRewriteAsMultiValueInsert;
}
public boolean containsOnDuplicateKeyUpdateInSQL() {
return this.isOnDuplicateKeyUpdate;
}
private void buildRewriteBatchedParams(String sql, Session session, String encoding) {
this.valuesClause = extractValuesClause(sql, session.getIdentifierQuoteString());
String odkuClause = this.isOnDuplicateKeyUpdate ? sql.substring(this.locationOfOnDuplicateKeyUpdate) : null;
String headSql = null;
if (this.isOnDuplicateKeyUpdate) {
headSql = sql.substring(0, this.locationOfOnDuplicateKeyUpdate);
} else {
headSql = sql;
}
this.batchHead = new ParseInfo(headSql, session, encoding, false);
this.batchValues = new ParseInfo("," + this.valuesClause, session, encoding, false);
this.batchODKUClause = null;
if (odkuClause != null && odkuClause.length() > 0) {
this.batchODKUClause = new ParseInfo("," + this.valuesClause + " " + odkuClause, session, encoding, false);
}
}
private String extractValuesClause(String sql, String quoteCharStr) {
int indexOfValues = -1;
int valuesSearchStart = this.statementStartPos;
while (indexOfValues == -1) {
if (quoteCharStr.length() > 0) {
indexOfValues = StringUtils.indexOfIgnoreCase(valuesSearchStart, sql, "VALUES", quoteCharStr, quoteCharStr,
StringUtils.SEARCH_MODE__MRK_COM_WS);
} else {
indexOfValues = StringUtils.indexOfIgnoreCase(valuesSearchStart, sql, "VALUES");
}
if (indexOfValues > 0) {
/* check if the char immediately preceding VALUES may be part of the table name */
char c = sql.charAt(indexOfValues - 1);
if (!(Character.isWhitespace(c) || c == ')' || c == '`')) {
valuesSearchStart = indexOfValues + 6;
indexOfValues = -1;
} else {
/* check if the char immediately following VALUES may be whitespace or open parenthesis */
c = sql.charAt(indexOfValues + 6);
if (!(Character.isWhitespace(c) || c == '(')) {
valuesSearchStart = indexOfValues + 6;
indexOfValues = -1;
}
}
} else {
break;
}
}
if (indexOfValues == -1) {
return null;
}
int indexOfFirstParen = sql.indexOf('(', indexOfValues + 6);
if (indexOfFirstParen == -1) {
return null;
}
int endOfValuesClause = this.isOnDuplicateKeyUpdate ? this.locationOfOnDuplicateKeyUpdate : sql.length();
return sql.substring(indexOfFirstParen, endOfValuesClause);
}
/**
* Returns a ParseInfo for a multi-value INSERT for a batch of size numBatch (without parsing!).
*
* @param numBatch
* number of batched parameters
* @return {@link ParseInfo}
*/
public synchronized ParseInfo getParseInfoForBatch(int numBatch) {
AppendingBatchVisitor apv = new AppendingBatchVisitor();
buildInfoForBatch(numBatch, apv);
ParseInfo batchParseInfo = new ParseInfo(apv.getStaticSqlStrings(), this.firstStmtChar, this.foundLoadData, this.isOnDuplicateKeyUpdate,
this.locationOfOnDuplicateKeyUpdate, this.statementLength, this.statementStartPos);
return batchParseInfo;
}
/**
* Returns a preparable SQL string for the number of batched parameters; used by server-side prepared statements
* when re-writing batch INSERTs.
*
* @param numBatch
* number of batched parameters
* @return SQL string
* @throws UnsupportedEncodingException
* if an error occurs
*/
public String getSqlForBatch(int numBatch) throws UnsupportedEncodingException {
ParseInfo batchInfo = getParseInfoForBatch(numBatch);
return batchInfo.getSqlForBatch();
}
/**
* Used for filling in the SQL for getPreparedSql() - for debugging
*
* @return sql string
* @throws UnsupportedEncodingException
* if an error occurs
*/
public String getSqlForBatch() throws UnsupportedEncodingException {
int size = 0;
final byte[][] sqlStrings = this.staticSql;
final int sqlStringsLength = sqlStrings.length;
for (int i = 0; i < sqlStringsLength; i++) {
size += sqlStrings[i].length;
size++; // for the '?'
}
StringBuilder buf = new StringBuilder(size);
for (int i = 0; i < sqlStringsLength - 1; i++) {
buf.append(StringUtils.toString(sqlStrings[i], this.charEncoding));
buf.append("?");
}
buf.append(StringUtils.toString(sqlStrings[sqlStringsLength - 1]));
return buf.toString();
}
/**
* Builds a ParseInfo for the given batch size, without parsing. We use
* a visitor pattern here, because the if {}s make computing a size for the
* resultant byte[][] make this too complex, and we don't necessarily want to
* use a List for this, because the size can be dynamic, and thus we'll not be
* able to guess a good initial size for an array-based list, and it's not
* efficient to convert a LinkedList to an array.
*
* @param numBatch
* number of batched parameters
* @param visitor
* visitor
*/
private void buildInfoForBatch(int numBatch, BatchVisitor visitor) {
if (!this.hasPlaceholders) {
if (numBatch == 1) {
// ParseInfo for a multi-value INSERT that doesn't have any placeholder may require two or more batches (depends on if ODKU is present or not).
// The original sql should be able to handle it.
visitor.append(this.staticSql[0]);
return;
}
// Without placeholders, only the values segment of the query needs repeating.
final byte[] headStaticSql = this.batchHead.staticSql[0];
visitor.append(headStaticSql).increment();
int numValueRepeats = numBatch - 1; // First one is in the "head".
if (this.batchODKUClause != null) {
numValueRepeats--; // Last one is in the ODKU clause.
}
final byte[] valuesStaticSql = this.batchValues.staticSql[0];
for (int i = 0; i < numValueRepeats; i++) {
visitor.mergeWithLast(valuesStaticSql).increment();
}
if (this.batchODKUClause != null) {
final byte[] batchOdkuStaticSql = this.batchODKUClause.staticSql[0];
visitor.mergeWithLast(batchOdkuStaticSql).increment();
}
return;
}
// Placeholders require assembling all the parts in each segment of the query and repeat them as needed.
// Add the head section except the last part.
final byte[][] headStaticSql = this.batchHead.staticSql;
final int headStaticSqlLength = headStaticSql.length;
byte[] endOfHead = headStaticSql[headStaticSqlLength - 1];
for (int i = 0; i < headStaticSqlLength - 1; i++) {
visitor.append(headStaticSql[i]).increment();
}
// Repeat the values section as many times as needed.
int numValueRepeats = numBatch - 1; // First one is in the "head".
if (this.batchODKUClause != null) {
numValueRepeats--; // Last one is in the ODKU clause.
}
final byte[][] valuesStaticSql = this.batchValues.staticSql;
final int valuesStaticSqlLength = valuesStaticSql.length;
byte[] beginOfValues = valuesStaticSql[0];
byte[] endOfValues = valuesStaticSql[valuesStaticSqlLength - 1];
for (int i = 0; i < numValueRepeats; i++) {
visitor.merge(endOfValues, beginOfValues).increment();
for (int j = 1; j < valuesStaticSqlLength - 1; j++) {
visitor.append(valuesStaticSql[j]).increment();
}
}
// Append the last value and/or ending.
if (this.batchODKUClause != null) {
final byte[][] batchOdkuStaticSql = this.batchODKUClause.staticSql;
final int batchOdkuStaticSqlLength = batchOdkuStaticSql.length;
byte[] beginOfOdku = batchOdkuStaticSql[0];
byte[] endOfOdku = batchOdkuStaticSql[batchOdkuStaticSqlLength - 1];
if (numBatch > 1) {
visitor.merge(numValueRepeats > 0 ? endOfValues : endOfHead, beginOfOdku).increment();
for (int i = 1; i < batchOdkuStaticSqlLength; i++) {
visitor.append(batchOdkuStaticSql[i]).increment();
}
} else {
visitor.append(endOfOdku).increment();
}
} else {
visitor.append(endOfHead);
}
}
protected static int findStartOfStatement(String sql) {
int statementStartPos = 0;
if (StringUtils.startsWithIgnoreCaseAndWs(sql, "/*")) {
statementStartPos = sql.indexOf("*/");
if (statementStartPos == -1) {
statementStartPos = 0;
} else {
statementStartPos += 2;
}
} else if (StringUtils.startsWithIgnoreCaseAndWs(sql, "--") || StringUtils.startsWithIgnoreCaseAndWs(sql, "#")) {
statementStartPos = sql.indexOf('\n');
if (statementStartPos == -1) {
statementStartPos = sql.indexOf('\r');
if (statementStartPos == -1) {
statementStartPos = 0;
}
}
}
return statementStartPos;
}
public static int getOnDuplicateKeyLocation(String sql, boolean dontCheckOnDuplicateKeyUpdateInSQL, boolean rewriteBatchedStatements,
boolean noBackslashEscapes) {
return dontCheckOnDuplicateKeyUpdateInSQL && !rewriteBatchedStatements ? -1 : StringUtils.indexOfIgnoreCase(0, sql, ON_DUPLICATE_KEY_UPDATE_CLAUSE,
"\"'`", "\"'`", noBackslashEscapes ? StringUtils.SEARCH_MODE__MRK_COM_WS : StringUtils.SEARCH_MODE__ALL);
}
protected static boolean canRewrite(String sql, boolean isOnDuplicateKeyUpdate, int locationOfOnDuplicateKeyUpdate, int statementStartPos) {
// Needs to be INSERT or REPLACE.
// Can't have INSERT ... SELECT or INSERT ... ON DUPLICATE KEY UPDATE with an id=LAST_INSERT_ID(...).
if (StringUtils.startsWithIgnoreCaseAndWs(sql, "INSERT", statementStartPos)) {
if (StringUtils.indexOfIgnoreCase(statementStartPos, sql, "SELECT", "\"'`", "\"'`", StringUtils.SEARCH_MODE__MRK_COM_WS) != -1) {
return false;
}
if (isOnDuplicateKeyUpdate) {
int updateClausePos = StringUtils.indexOfIgnoreCase(locationOfOnDuplicateKeyUpdate, sql, " UPDATE ");
if (updateClausePos != -1) {
return StringUtils.indexOfIgnoreCase(updateClausePos, sql, "LAST_INSERT_ID", "\"'`", "\"'`", StringUtils.SEARCH_MODE__MRK_COM_WS) == -1;
}
}
return true;
}
return StringUtils.startsWithIgnoreCaseAndWs(sql, "REPLACE", statementStartPos)
&& StringUtils.indexOfIgnoreCase(statementStartPos, sql, "SELECT", "\"'`", "\"'`", StringUtils.SEARCH_MODE__MRK_COM_WS) == -1;
}
public boolean isFoundLoadData() {
return this.foundLoadData;
}
public char getFirstStmtChar() {
return this.firstStmtChar;
}
}
