麻煩準備數據庫查詢

Question

我正在寫一個java函數，我試圖建立一個數據庫查詢但字符串的元素不被替換。

這是我的查詢：

BOOK 

Host: 
Database: AVIATION 

Generation Time: May 12, 2015 at 07:32:00 AM 

Generated by: phpMyAdmin 3.5.7/MySQL 5.6.10 

SQL query: SHOW columns FROM BOOK 

Rows: 4 


Field Type Null Key Default Extra 

timestamp varchar(15) NO NULL 

concept varchar(50) NO NULL 

page varchar(5) YES NULL 

chapter varchar(20) NO NULL 

section varchar(20) YES NULL 

course varchar(10) NO NULL 

book varchar(20) YES NULL 

module varchar(2) YES NULL 

comments varchar(250) YES NULL 

Java函數

public String prepareQuery(String q) { 
    String[] array = q.split("\n"); 
    String q2 = " "; 

    q2 += "CREATE TABLE BOOK (\n"; 

    for (int i = 10; i < array.length; i++) { 
      q2 += array[i]; 
      q2 += ",\n"; 
    } 

    q2 += "\n);"; 
    // Replacing double spaces to single space 
    q2 = q2.replaceAll(" ", " "); 
    // this part is not working as if i see output YES NULL is still there 
    q2 = q2.replaceAll(" Yes NULL ,", ","); 
    // changing NO to NULL and working 
    q2 = q2.replaceAll("NO" , "NOT"); 

    return q2; 

} 

此功能將取代一切，除了 「是空」。

Answer 1

爲我工作，如果我這一行替換代碼：

public String prepareQuery(String q) { 
     String[] array = q.split("\n"); 
     String q2 = " "; 

     q2 += "CREATE TABLE BOOK (\n"; 

     for (int i = 10; i < array.length; i++) { 
      q2 += array[i]; 
      if (i == array.length - 1) 
       q2 += "\n"; 
      else 
       q2 += ",\n"; 
     } 

     q2 += "\n);"; 
     // Replacing double spaces to single space 
     q2 = q2.replaceAll(" ", " "); 
     // this part is not working as if i see output YES NULL is still there 
     q2 = q2.replaceAll(" YES NULL,", ","); 
     q2 = q2.replaceAll(" YES NULL ,", ","); 
     // changing NO to NULL and working 
     q2 = q2.replaceAll("NO" , "NOT"); 

     return q2; 

    }