content: package com.alibaba.druid.support.opds.udf;
  
  import com.alibaba.druid.DbType;
  import com.alibaba.druid.sql.parser.ParserException;
  import com.alibaba.druid.sql.visitor.ParameterizedOutputVisitorUtils;
  import com.alibaba.druid.support.json.JSONUtils;
  import com.aliyun.odps.udf.UDF;
  
  import java.util.ArrayList;
  import java.util.List;
  
  public class SqlParams extends UDF {
      public String evaluate(String sql) {
          return evaluate(sql, null, false);
      }
  
      public String evaluate(String sql, String dbTypeName) {
          return evaluate(sql, dbTypeName, false);
      }
  
      public String evaluate(String sql, String dbTypeName, boolean throwError) {
          try {
              DbType dbType = dbTypeName == null ? null : DbType.valueOf(dbTypeName);
              List<Object> outParameters = new ArrayList<Object>();
              ParameterizedOutputVisitorUtils.parameterize(sql, dbType, outParameters);
              return JSONUtils.toJSONString(outParameters);
          } catch (ParserException ex) {
              if (throwError) {
                  throw new IllegalArgumentException("error sql : \n" + sql, ex);
              }
  
              return null;
          }
      }
  }
  