Maven地址：

<dependency>
    <groupId>com.github.pagehelper</groupId>
    <artifactId>pagehelper</artifactId>
    <version>4.2.0</version>
</dependency>

測試：

import com.github.pagehelper.parser.SqlServer;

public class Test{
	public static final SqlServer sqlServer = new SqlServer();//初始化
	
	@Test  
	public void testSqlUnion() throws JSQLParserException {
		String originalSql = "select distinct countrycode,countryname from country order by countrycode";
		System.out.println(sqlServer.convertToPageSql(originalSql, 1, 10));
	}  
}
 

測試結果（已格式化）：

SELECT TOP 10 PAGE_TABLE_ALIAS.countrycode, PAGE_TABLE_ALIAS.countryname  
  FROM (SELECT DISTINCT ROW_NUMBER() OVER(ORDER BY countrycode) PAGE_ROW_NUMBER,  
                        countrycode,  
                        countryname  
          FROM country) AS PAGE_TABLE_ALIAS  
 WHERE PAGE_ROW_NUMBER > 1  
 ORDER BY PAGE_ROW_NUMBER  
 

注意：

1.由於需要提取order by，所以儘可能保證最外層的SQL包含order by
2.如果沒有order by，那麼上面呼叫的convertToPageSql還有第四個引數orderBy

public String convertToPageSql(String sql, int offset, int limit, String orderBy)

如果原來的sql有order by，那麼通過該方法指定orderBy之後會覆蓋原sql中的order by
人為指定的時候很難把握欄位名字的寫法，所以建議在sql中帶上order by