ibatis in 1000 仅供参考

 SQL的動態where 拼寫實現

	/**
	 * or　拼 in(num个)
	 * 列名
	 * list
	 * in中多少个元素
	 */
	public String createSql(String col, List<String> partners, int num) {

		StringBuffer sb = new StringBuffer();
		
		// COL in (1,2,3,4,5,6) 
		// or
		// COL in (7,8,9,10,11,12)
		
		// ->
		// COL in (
		// 1,2,3,4,5,6) 
		// or COL in (
		// 7,8,9,10,11,12)
		sb.append(col + " in (");
		
		int size = partners.size();
		for (int i=1;i<(size+1);i++) {
			
			int shang = i/num;
			int yushu = i%num;
			
			
			if(yushu == 0){
				
				sb.append("'" + partners.get(i-1) + "')");
				
				if((i!=size)&&(shang != 0)){
					sb.append(" or ");
					sb.append(col + " in (");
				}
			}else{
				
				if(i==size){
					
					sb.append("'" + partners.get(i-1) + "')");
				}else{
					
					sb.append("'" + partners.get(i-1) + "',");
				}
				
			}
			
		}
		
		
		return sb.toString();
	}

測試用例

@Test
	public void test() {

		List partners = new ArrayList();
		partners.clear();
		for (int i = 1; i < 9; i++) {
			
			partners.add(String.valueOf(i));
		}
		
		String s = createSql("COL", partners, 10);
		System.out.println(s);

		/////////////////////////////////////////////////////////////////////////////////
		
		partners.clear();
		for (int i = 1; i < 10; i++) {
			
			partners.add(String.valueOf(i));
		}
		
		s = createSql("COL", partners, 10);
		System.out.println(s);
		
		/////////////////////////////////////////////////////////////////////////////////
		
		partners.clear();
		for (int i = 1; i < 11; i++) {

			partners.add(String.valueOf(i));
		}

		s = createSql("COL", partners, 10);
		System.out.println(s);
		
		/////////////////////////////////////////////////////////////////////////////////
		
		partners.clear();
		for (int i = 1; i < 12; i++) {

			partners.add(String.valueOf(i));
		}

		s = createSql("COL", partners, 10);
		System.out.println(s);
		
		/////////////////////////////////////////////////////////////////////////////////
				
		partners.clear();
		for (int i = 1; i < 13; i++) {
		
			partners.add(String.valueOf(i));
		}
		
		s = createSql("COL", partners, 10);
		System.out.println(s);
		
		/////////////////////////////////////////////////////////////////////////////////
		
		partners.clear();
		for (int i = 1; i < 20; i++) {
		
			partners.add(String.valueOf(i));
		}
		
		s = createSql("COL", partners, 10);
		System.out.println(s);
		
		/////////////////////////////////////////////////////////////////////////////////
		
		partners.clear();
		for (int i = 1; i < 21; i++) {
		
			partners.add(String.valueOf(i));
		}
		
		s = createSql("COL", partners, 10);
		System.out.println(s);
		
		/////////////////////////////////////////////////////////////////////////////////
		
		partners.clear();
		for (int i = 1; i < 22; i++) {
		
			partners.add(String.valueOf(i));
		}
		
		s = createSql("COL", partners, 10);
		System.out.println(s);
		
	}

實行結果

COL in ('1','2','3','4','5','6','7','8')
COL in ('1','2','3','4','5','6','7','8','9')
COL in ('1','2','3','4','5','6','7','8','9','10')
COL in ('1','2','3','4','5','6','7','8','9','10') or COL in ('11')
COL in ('1','2','3','4','5','6','7','8','9','10') or COL in ('11','12')
COL in ('1','2','3','4','5','6','7','8','9','10') or COL in ('11','12','13','14','15','16','17','18','19')
COL in ('1','2','3','4','5','6','7','8','9','10') or COL in ('11','12','13','14','15','16','17','18','19','20')
COL in ('1','2','3','4','5','6','7','8','9','10') or COL in ('11','12','13','14','15','16','17','18','19','20') or COL in ('21')

 

来源：CSDN

作者：猛吃仙子

链接：https://blog.csdn.net/MENGCHIXIANZI/article/details/104180547