/*
* 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.SQLExpr;
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.SQLInListExpr;
import com.alibaba.druid.sql.ast.expr.SQLLiteralExpr;
import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
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.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();
SQLStatement statemen = statementList.get(0);
StringBuilder out = new StringBuilder();
SQLASTOutputVisitor visitor = createParameterizedOutputVisitor(out, dbType);
statemen.accept(visitor);
return out.toString();
}
public static SQLASTOutputVisitor 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.H2.equals(dbType)) {
return new MySqlParameterizedOutputVisitor(out);
}
if (JdbcUtils.POSTGRESQL.equals(dbType)) {
return new PGParameterizedOutputVisitor(out);
}
return new ParameterizedOutputVisitor(out);
}
public static boolean visit(SQLASTOutputVisitor v, SQLInListExpr x) {
x.getExpr().accept(v);
if (x.isNot()) {
v.print(" NOT IN (?)");
} else {
v.print(" IN (?)");
}
return false;
}
public static SQLBinaryOpExpr merge(SQLBinaryOpExpr x) {
if (x.getLeft() instanceof SQLLiteralExpr && x.getRight() instanceof SQLLiteralExpr) {
if (x.getOperator() == SQLBinaryOperator.Equality || x.getOperator() == SQLBinaryOperator.NotEqual) {
x.getLeft().getAttributes().put(ATTR_PARAMS_SKIP, true);
x.getRight().getAttributes().put(ATTR_PARAMS_SKIP, true);
}
return x;
}
if (x.getRight() instanceof SQLLiteralExpr) {
x = new SQLBinaryOpExpr(x.getLeft(), x.getOperator(), new SQLVariantRefExpr("?"));
}
if (x.getLeft() instanceof SQLLiteralExpr) {
x = new SQLBinaryOpExpr(new SQLVariantRefExpr("?"), x.getOperator(), x.getRight());
}
for (;;) {
if (x.getRight() instanceof SQLBinaryOpExpr) {
if (x.getLeft() instanceof SQLBinaryOpExpr) {
SQLBinaryOpExpr leftBinaryExpr = (SQLBinaryOpExpr) x.getLeft();
if (leftBinaryExpr.getRight().equals(x.getRight())) {
x = leftBinaryExpr;
continue;
}
}
x = new SQLBinaryOpExpr(x.getLeft(), x.getOperator(), merge((SQLBinaryOpExpr) x.getRight()));
}
break;
}
if (x.getLeft() instanceof SQLBinaryOpExpr) {
x = new SQLBinaryOpExpr(merge((SQLBinaryOpExpr) x.getLeft()), x.getOperator(), x.getRight());
}
// ID = ? OR ID = ? => ID = ?
if (x.getOperator() == SQLBinaryOperator.BooleanOr) {
if ((x.getLeft() instanceof SQLBinaryOpExpr) && (x.getRight() instanceof SQLBinaryOpExpr)) {
SQLBinaryOpExpr left = (SQLBinaryOpExpr) x.getLeft();
SQLBinaryOpExpr right = (SQLBinaryOpExpr) x.getRight();
if (mergeEqual(left, right)) {
return left;
}
if (isLiteralExpr(left.getLeft()) && left.getOperator() == SQLBinaryOperator.BooleanOr) {
if (mergeEqual(left.getRight(), right)) {
return left;
}
}
}
}
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;
}
}