报表查询参数问题

yaodudu

demo参数查询案例中， if(!"".equals(name))不明白意思。！代表什么""代表什么.equals代表什么？个人开始理解为判断name参数是否为空，不为空执行，但是在实际应用中，我没有设置name的参数框，同样执行了此条件判断中的语句。附案例脚本如下：
public static Table parameterFilterQuery(String name, String id){
  
  String oracle = "SELECT RPRODUCTID , RPRODUCTNAME , (SELECT RCATEGORYNAME FROM DEMO_REPORTPRODUCTCATEGORY WHERE DEMO_REPORTPRODUCTCATEGORY.RCATEGORYID = DEMO_REPORTPRODUCTS.RCATEGORYID) AS RCATEGORYNAME , (SELECT RCOMPANYNAME FROM DEMO_REPORTSUPPLIERS WHERE DEMO_REPORTSUPPLIERS.RSUPPLIERID = DEMO_REPORTPRODUCTS.RSUPPLIERID)AS RCOMPANYNAME,RQUANTITYPERUNIT,RUNITPRICE,RUNITSINSTOCK FROM DEMO_REPORTPRODUCTS";
  String mssql = "SELECT RPRODUCTID , RPRODUCTNAME , (SELECT RCATEGORYNAME FROM DEMO_REPORTPRODUCTCATEGORY WHERE DEMO_REPORTPRODUCTCATEGORY.RCATEGORYID = DEMO_REPORTPRODUCTS.RCATEGORYID) AS RCATEGORYNAME , (SELECT RCOMPANYNAME FROM DEMO_REPORTSUPPLIERS WHERE DEMO_REPORTSUPPLIERS.RSUPPLIERID = DEMO_REPORTPRODUCTS.RSUPPLIERID)AS RCOMPANYNAME,RQUANTITYPERUNIT,RUNITPRICE,RUNITSINSTOCK FROM DEMO_REPORTPRODUCTS";
  
  oracle += " WHERE 1=1 ";
  mssql += " WHERE 1=1 ";
  
  if(!"".equals(name)){
   oracle += "and RPRODUCTNAME like '%"+name+"%' ";
   mssql += "and RPRODUCTNAME like '%"+name+"%' ";
  }
  if(!"".equals(id)){
   oracle += String.format("and RPRODUCTID = '%s' ", id);
   mssql += String.format("and RPRODUCTID = '%s' ", id);
  }

腹部流出的肉

if(!"".equals(name))表示name不是空串时执行if里面的