/*
* Copyright 1999-2011 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.visitor;
import java.util.List;
import com.alibaba.druid.sql.ast.SQLDataType;
import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLStatement;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOpExpr;
import com.alibaba.druid.sql.ast.expr.SQLBinaryOperator;
import com.alibaba.druid.sql.ast.expr.SQLCharExpr;
import com.alibaba.druid.sql.ast.expr.SQLHexExpr;
import com.alibaba.druid.sql.ast.expr.SQLInListExpr;
import com.alibaba.druid.sql.ast.expr.SQLIntegerExpr;
import com.alibaba.druid.sql.ast.expr.SQLLiteralExpr;
import com.alibaba.druid.sql.ast.expr.SQLNCharExpr;
import com.alibaba.druid.sql.ast.expr.SQLNullExpr;
import com.alibaba.druid.sql.ast.expr.SQLNumberExpr;
import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
import com.alibaba.druid.sql.ast.statement.SQLAssignItem;
import com.alibaba.druid.sql.ast.statement.SQLColumnDefinition;
import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
import com.alibaba.druid.sql.dialect.db2.visitor.DB2ParameterizedOutputVisitor;
import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlParameterizedOutputVisitor;
import com.alibaba.druid.sql.dialect.oracle.visitor.OracleParameterizedOutputVisitor;
import com.alibaba.druid.sql.dialect.postgresql.visitor.PGParameterizedOutputVisitor;
import com.alibaba.druid.sql.dialect.sqlserver.ast.SQLServerTop;
import com.alibaba.druid.sql.dialect.sqlserver.visitor.SQLServerParameterizedOutputVisitor;
import com.alibaba.druid.sql.parser.SQLParserUtils;
import com.alibaba.druid.sql.parser.SQLStatementParser;
import com.alibaba.druid.util.JdbcUtils;
public class ParameterizedOutputVisitorUtils {
public static final String ATTR_PARAMS_SKIP = "druid.parameterized.skip";
public static String parameterize(String sql, String dbType) {
SQLStatementParser parser = SQLParserUtils.createSQLStatementParser(sql, dbType);
List<SQLStatement> statementList = parser.parseStatementList();
if (statementList.size() == 0) {
return sql;
}
StringBuilder out = new StringBuilder();
ParameterizedVisitor visitor = createParameterizedOutputVisitor(out, dbType);
for (int i = 0; i < statementList.size(); i++) {
if (i > 0) {
out.append(";\n");
}
SQLStatement stmt = statementList.get(i);
stmt.accept(visitor);
}
if (visitor.getReplaceCount() == 0 && !parser.getLexer().isHasComment()) {
return sql;
}
return out.toString();
}
public static ParameterizedVisitor createParameterizedOutputVisitor(Appendable out, String dbType) {
if (JdbcUtils.ORACLE.equals(dbType) || JdbcUtils.ALI_ORACLE.equals(dbType)) {
return new OracleParameterizedOutputVisitor(out);
}
if (JdbcUtils.MYSQL.equals(dbType)) {
return new MySqlParameterizedOutputVisitor(out);
}
if (JdbcUtils.MARIADB.equals(dbType)) {
return new MySqlParameterizedOutputVisitor(out);
}
if (JdbcUtils.H2.equals(dbType)) {
return new MySqlParameterizedOutputVisitor(out);
}
if (JdbcUtils.POSTGRESQL.equals(dbType)) {
return new PGParameterizedOutputVisitor(out);
}
if (JdbcUtils.SQL_SERVER.equals(dbType) || JdbcUtils.JTDS.equals(dbType)) {
return new SQLServerParameterizedOutputVisitor(out);
}
if (JdbcUtils.DB2.equals(dbType)) {
return new DB2ParameterizedOutputVisitor(out);
}
return new ParameterizedOutputVisitor(out);
}
public static boolean visit(ParameterizedVisitor v, SQLInListExpr x) {
List<SQLExpr> targetList = x.getTargetList();
boolean changed = true;
if (targetList.size() == 1 && targetList.get(0) instanceof SQLVariantRefExpr) {
changed = false;
}
x.getExpr().accept(v);
if (x.isNot()) {
v.print(" NOT IN (?)");
} else {
v.print(" IN (?)");
}
if (changed) {
v.incrementReplaceCunt();
}
return false;
}
public static boolean visit(ParameterizedVisitor v, SQLIntegerExpr x) {
if (!checkParameterize(x)) {
return SQLASTOutputVisitorUtils.visit(v, x);
}
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static boolean visit(ParameterizedVisitor v, SQLNumberExpr x) {
if (!checkParameterize(x)) {
return SQLASTOutputVisitorUtils.visit(v, x);
}
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static boolean visit(ParameterizedVisitor v, SQLCharExpr x) {
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static boolean checkParameterize(SQLObject x) {
if (Boolean.TRUE.equals(x.getAttribute(ParameterizedOutputVisitorUtils.ATTR_PARAMS_SKIP))) {
return false;
}
SQLObject parent = x.getParent();
if (parent instanceof SQLDataType //
|| parent instanceof SQLColumnDefinition //
|| parent instanceof SQLServerTop //
|| parent instanceof SQLAssignItem //
|| parent instanceof SQLSelectOrderByItem //
) {
return false;
}
return true;
}
public static boolean visit(ParameterizedVisitor v, SQLNCharExpr x) {
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static boolean visit(ParameterizedVisitor v, SQLNullExpr x) {
SQLObject parent = x.getParent();
if (parent instanceof SQLBinaryOpExpr) {
SQLBinaryOpExpr binaryOpExpr = (SQLBinaryOpExpr) parent;
if (binaryOpExpr.getOperator() == SQLBinaryOperator.IsNot
|| binaryOpExpr.getOperator() == SQLBinaryOperator.Is) {
v.print("NULL");
return false;
}
}
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static boolean visit(ParameterizedVisitor v, SQLVariantRefExpr x) {
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static boolean visit(ParameterizedVisitor v, SQLHexExpr x) {
v.print('?');
v.incrementReplaceCunt();
return false;
}
public static SQLBinaryOpExpr merge(ParameterizedVisitor v, SQLBinaryOpExpr x) {
SQLExpr left = x.getLeft();
SQLExpr right = x.getRight();
SQLObject parent = x.getParent();
if (left instanceof SQLLiteralExpr && right instanceof SQLLiteralExpr) {
if (x.getOperator() == SQLBinaryOperator.Equality //
|| x.getOperator() == SQLBinaryOperator.NotEqual) {
if((left instanceof SQLIntegerExpr) && (right instanceof SQLIntegerExpr) ) {
if (((SQLIntegerExpr) left).getNumber().intValue() < 100) {
left.putAttribute(ATTR_PARAMS_SKIP, true);
}
if (((SQLIntegerExpr) right).getNumber().intValue() < 100) {
right.putAttribute(ATTR_PARAMS_SKIP, true);
}
} else {
left.putAttribute(ATTR_PARAMS_SKIP, true);
right.putAttribute(ATTR_PARAMS_SKIP, true);
}
}
return x;
}
for (;;) {
if (x.getRight() instanceof SQLBinaryOpExpr) {
if (x.getLeft() instanceof SQLBinaryOpExpr) {
SQLBinaryOpExpr leftBinaryExpr = (SQLBinaryOpExpr) x.getLeft();
if (leftBinaryExpr.getRight().equals(x.getRight())) {
x = leftBinaryExpr;
v.incrementReplaceCunt();
continue;
}
}
SQLExpr mergedRight = merge(v, (SQLBinaryOpExpr) x.getRight());
if (mergedRight != x.getRight()) {
x = new SQLBinaryOpExpr(x.getLeft(), x.getOperator(), mergedRight);
v.incrementReplaceCunt();
}
x.setParent(parent);
}
break;
}
if (x.getLeft() instanceof SQLBinaryOpExpr) {
SQLExpr mergedLeft = merge(v, (SQLBinaryOpExpr) x.getLeft());
if (mergedLeft != x.getLeft()) {
x = new SQLBinaryOpExpr(mergedLeft, x.getOperator(), x.getRight());
v.incrementReplaceCunt();
}
x.setParent(parent);
}
// ID = ? OR ID = ? => ID = ?
if (x.getOperator() == SQLBinaryOperator.BooleanOr) {
if ((left instanceof SQLBinaryOpExpr) && (right instanceof SQLBinaryOpExpr)) {
SQLBinaryOpExpr leftBinary = (SQLBinaryOpExpr) x.getLeft();
SQLBinaryOpExpr rightBinary = (SQLBinaryOpExpr) x.getRight();
if (mergeEqual(leftBinary, rightBinary)) {
v.incrementReplaceCunt();
return leftBinary;
}
if (isLiteralExpr(leftBinary.getLeft()) //
&& leftBinary.getOperator() == SQLBinaryOperator.BooleanOr) {
if (mergeEqual(leftBinary.getRight(), right)) {
v.incrementReplaceCunt();
return leftBinary;
}
}
}
}
return x;
}
private static boolean mergeEqual(SQLExpr a, SQLExpr b) {
if (!(a instanceof SQLBinaryOpExpr)) {
return false;
}
if (!(b instanceof SQLBinaryOpExpr)) {
return false;
}
SQLBinaryOpExpr binaryA = (SQLBinaryOpExpr) a;
SQLBinaryOpExpr binaryB = (SQLBinaryOpExpr) b;
if (binaryA.getOperator() != SQLBinaryOperator.Equality) {
return false;
}
if (binaryB.getOperator() != SQLBinaryOperator.Equality) {
return false;
}
if (!(binaryA.getRight() instanceof SQLLiteralExpr || binaryA.getRight() instanceof SQLVariantRefExpr)) {
return false;
}
if (!(binaryB.getRight() instanceof SQLLiteralExpr || binaryB.getRight() instanceof SQLVariantRefExpr)) {
return false;
}
return binaryA.getLeft().toString().equals(binaryB.getLeft().toString());
}
private static boolean isLiteralExpr(SQLExpr expr) {
if (expr instanceof SQLLiteralExpr) {
return true;
}
if (expr instanceof SQLBinaryOpExpr) {
SQLBinaryOpExpr binary = (SQLBinaryOpExpr) expr;
return isLiteralExpr(binary.getLeft()) && isLiteralExpr(binary.getRight());
}
return false;
}
}