StringBuilder（）追加在最後一次迭代的交易ID

Question

在Xls文件中我有下面的代碼上傳下面的方法調用，直到XLS的最後一行&我正在將值追加到StringBuilder。

 public boolean insertBatch(Connection con, int projectId, int venueId, String batchName, String examStartDate, String examStartTime, String examEndTime, String reportingStartTime, String reportingEndTime, int totalSeats) { 
    String this.query = new StringBuilder().append("insert into venue_batch (batch_code ,exam_venue_id ,exam_date ,exam_start_time ,exam_end_time ,reporting_start_time ,reporting_end_time ,total_seats,tranID) VALUES ('").append(batchName).append("' ,").append(venueId).append(" ,'").append(stDate).append("' ,'").append(examStartTime).append("' ,'").append(examEndTime).append("' ,'").append(reportingStartTime).append("' ,'").append(reportingEndTime).append("' ,").append(totalSeats).append(")").toString(); 
       try { 
        this.stmt = con.createStatement(); 
        count = this.stmt.executeUpdate(this.query); 
        this.stmt.close(); 
       } catch (SQLException ex) { 
        System.out.println(new StringBuilder().append("Venue # insertBatch # SQLException").append(ex.toString()).toString()); 
        onUploadFail(con, "Please try again!"); 
       } 
    } 

*I need to add Unique Transaction id(VenueTranId) to DB at the last during executeUpdate(this.query), in the above Query how to Proceed below is Transaction id code.Thanks All.. 

      Calendar calendar = Calendar.getInstance(); 
     Long lngTime = Long.valueOf(calendar.getTimeInMillis()); 
     String VenueTranId=lngTime.toString(); 

Answer 1

將StringBuilder存儲在一個變量中，以便稍後可以將任何所需的內容附加到該變量中。

public boolean insertBatch(Connection con, int projectId, int venueId, String batchName, String examStartDate, String examStartTime, String examEndTime, String reportingStartTime, String reportingEndTime, int totalSeats) { 
StringBuilder query = new StringBuilder(); 
query.append("insert "); 
query.append("more blabla "); 

try { 
    this.stmt = con.createStatement(); 
    count = this.stmt.executeUpdate(this.query.toString()); 
    this.stmt.close(); 
} catch (SQLException ex) { 
       query.append(" Failed: "+ex.getMessage()); 
} finally { 
    String VenueTranId = computeId(); 
    query.append(VenueTranId); 
}