content: /*
   * Copyright 1999-2018 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.oracle.demo;
  
  import com.alibaba.druid.sql.SQLUtils;
  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.SQLIdentifierExpr;
  import com.alibaba.druid.sql.ast.expr.SQLNumericLiteralExpr;
  import com.alibaba.druid.sql.ast.expr.SQLPropertyExpr;
  import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
  import com.alibaba.druid.sql.ast.statement.SQLExprTableSource;
  import com.alibaba.druid.sql.dialect.mysql.parser.MySqlStatementParser;
  import com.alibaba.druid.sql.dialect.mysql.visitor.MySqlASTVisitorAdapter;
  import com.alibaba.druid.sql.parser.SQLStatementParser;
  import junit.framework.TestCase;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class Demo2 extends TestCase {
      public void test_0() throws Exception {
          String sql = "select * from user where uid = 2 and uname = ?";
          List<Object> parameters = new ArrayList<Object>();
          parameters.add(1);
          parameters.add("wenshao");
  
          SQLStatementParser parser = new MySqlStatementParser(sql);
          List<SQLStatement> stmtList = parser.parseStatementList();
  
          SQLStatement first = (SQLStatement) stmtList.get(0);
  
          MyVisitor visitor = new MyVisitor();
          first.accept(visitor);
  
          SQLExpr firstVar = visitor.getVariantList().get(0);
  
          int userId;
          if (firstVar instanceof SQLVariantRefExpr) {
              int varIndex = (Integer) firstVar.getAttribute("varIndex");
              userId = (Integer) parameters.get(varIndex);
          } else {
              userId = ((SQLNumericLiteralExpr) firstVar).getNumber().intValue();
          }
  
          String tableName;
          if (userId == 1) {
              tableName = "user_1";
          } else {
              tableName = "user_x";
          }
  
          for (SQLExprTableSource tableSource : visitor.getTableSourceList()) {
              SQLExpr expr = tableSource.getExpr();
              if (expr instanceof SQLIdentifierExpr) {
                  SQLIdentifierExpr identExpr = (SQLIdentifierExpr) expr;
                  String ident = identExpr.getName();
  
                  if (ident.equals("user")) {
                      tableSource.setExpr(tableName);
                  }
              } else if (expr instanceof SQLPropertyExpr) {
                  SQLPropertyExpr proExpr = (SQLPropertyExpr) expr;
                  String ident = proExpr.getName();
  
                  if (ident.equals("user")) {
                      proExpr.setName(tableName);
                  }
              }
          }
  
          String realSql = SQLUtils.toOracleString(first);
          System.out.println(realSql);
      }
  
      private static class MyVisitor extends MySqlASTVisitorAdapter {
          private int varIndex;
          private List<SQLExpr> variantList = new ArrayList<SQLExpr>();
          private List<SQLExprTableSource> tableSourceList = new ArrayList<SQLExprTableSource>();
  
          public boolean visit(SQLVariantRefExpr x) {
              x.getAttributes().put("varIndex", varIndex++);
              return true;
          }
  
          public boolean visit(SQLBinaryOpExpr x) {
              if (x.getLeft() instanceof SQLIdentifierExpr) {
                  if (x.getRight() instanceof SQLVariantRefExpr) {
                      SQLIdentifierExpr identExpr = (SQLIdentifierExpr) x.getLeft();
                      String ident = identExpr.getName();
                      if (ident.equals("uid")) {
                          variantList.add(x.getRight());
                      }
                  } else if (x.getRight() instanceof SQLNumericLiteralExpr) {
                      variantList.add(x.getRight());
                  }
              }
  
              return true;
          }
  
          public boolean visit(SQLExprTableSource x) {
              tableSourceList.add(x);
              return true;
          }
  
          public int getVarIndex() {
              return varIndex;
          }
  
          public void setVarIndex(int varIndex) {
              this.varIndex = varIndex;
          }
  
          public List<SQLExpr> getVariantList() {
              return variantList;
          }
  
          public List<SQLExprTableSource> getTableSourceList() {
              return tableSourceList;
          }
  
      }
  }
  