尝试使用查询中的限制函数从 MYSql 数据库中获取记录时，我在 java 中遇到了这个奇怪的问题。不知道出了什么问题或做错了什么，这个查询让我很难过。
问题 - 当我通过我的 java 程序运行此查询时，它会返回所有记录，而不是将记录限制为 10，如限制中给出的那样。
在 MYSql 命令行中运行相同的查询时，它执行得非常好并且只获取了 10 个记录。
下面是java代码和查询。任何帮助或支持表示赞赏。！
Java 代码 -
public UserVO getApplUserDetailsList(UserVO userVO) throws CAPDAOException {
List<UserVO> returnList = null;
String methodName = "getApplUserDetails()";
Session session = null;
String queryString = null;
Transaction transaction = null;
PreparedStatement ps = null;
ResultSet rs = null;
if(userVO == null)
{
logger.writeToTivoliAlertLog(className, CAPConstants.ERROR, methodName, null, "userVO returned null. Busines validation error.!", null);
throw new CAPDAOException("userVO returned null. Busines validation error.!",CAPException.BUSINESS_VALIDATION_ERROR_SECURITY);
}
try {
returnList = new ArrayList<UserVO>();
System.out.println("");
String appusr = userVO.getAppUsrNm();
session = getSession();
transaction = session.beginTransaction();
if(userVO.getAppUsrRoleCd()!=null && !userVO.getAppUsrRoleCd().trim().equalsIgnoreCase(CAPConstants.DEFAULT_DROPDOWN_VALUE)){
queryString = "SELECT " +
"APPL_USR_ID,APPL_USR_NM,APPL_USR_FRST_NM, " +
"APPL_USR_LST_NM,ACCESS_ROLE_CD " +
"FROM APPL_USR " +
"WHERE " +
"APPL_USR_NM LIKE ?"+
" AND APPL_USR_FRST_NM LIKE ?"+
" AND APPL_USR_LST_NM LIKE ?"+
" AND ACCESS_ROLE_CD = ?"+
" AND APPL_USR_ID != ?";
ps = session.connection().prepareStatement(queryString);
ps.setString(1,userVO.getAppUsrNm()+CAPConstants.PERCENTILE_SYMBOL);
ps.setString(2,userVO.getAppUsrFirstNm()+CAPConstants.PERCENTILE_SYMBOL);
ps.setString(3,userVO.getAppUsrLastNm()+CAPConstants.PERCENTILE_SYMBOL);
ps.setString(4,userVO.getAppUsrRoleCd());
ps.setInt(5, 1);
}
else
{
queryString = "SELECT " +
"APPL_USR_ID,APPL_USR_NM,APPL_USR_FRST_NM, " +
"APPL_USR_LST_NM,ACCESS_ROLE_CD " +
"FROM APPL_USR " +
"WHERE " +
"APPL_USR_NM LIKE ?"+
" AND APPL_USR_FRST_NM LIKE ?"+
" AND APPL_USR_LST_NM LIKE ?"+
" AND APPL_USR_ID != ?";
ps = session.connection().prepareStatement(queryString);
ps.setString(1,userVO.getAppUsrNm()+CAPConstants.PERCENTILE_SYMBOL);
ps.setString(2,userVO.getAppUsrFirstNm()+CAPConstants.PERCENTILE_SYMBOL);
ps.setString(3,userVO.getAppUsrLastNm()+CAPConstants.PERCENTILE_SYMBOL);
ps.setInt(4, 1);
}
if(userVO.getQueryAction()!=null && userVO.getQueryAction().equals(CAPConstants.GET_DATA))
queryString += " ORDER BY APPL_USR_ID LIMIT " + userVO.getPAGE_MIN_LIMIT() + ", " + userVO.getPAGE_MAX_LIMIT();
else
queryString += " ORDER BY APPL_USR_ID";
rs = ps.executeQuery();
if(userVO.getQueryAction()!=null && userVO.getQueryAction().equals(CAPConstants.GET_DATA))
{
int tempCOunt = 0;
while(rs!=null && rs.next())
{
tempCOunt ++;
UserVO returnVO = new UserVO();
returnVO.setAppUsrId(rs.getInt("APPL_USR_ID"));
returnVO.setAppUsrNm(rs.getString("APPL_USR_NM"));
returnVO.setAppUsrFirstNm(rs.getString("APPL_USR_FRST_NM"));
returnVO.setAppUsrLastNm(rs.getString("APPL_USR_LST_NM"));
if (rs.getString("ACCESS_ROLE_CD")!=null && rs.getString("ACCESS_ROLE_CD").trim().equalsIgnoreCase(CAPConstants.ADMINISTRATOR_ROLE_CD))
returnVO.setApplicationLevelRole("Administrator");
else if (rs.getString("ACCESS_ROLE_CD")!=null && rs.getString("ACCESS_ROLE_CD").trim().equalsIgnoreCase(CAPConstants.MAINTAINER_ROLE_CD))
returnVO.setApplicationLevelRole("Maintainer");
else if (rs.getString("ACCESS_ROLE_CD")!=null && rs.getString("ACCESS_ROLE_CD").trim().equalsIgnoreCase(CAPConstants.VIEWER_ROLE_CD))
returnVO.setApplicationLevelRole("Viewer");
else
returnVO.setApplicationLevelRole("None");
returnList.add(returnVO);
}
System.out.println("Count >>>>>>>>>>>>>>>>>>> "+tempCOunt);
userVO.setReturnListFromDB(returnList);
}
else
{
int rowcount = 0;
if (rs.last()) {
rowcount = rs.getRow();
rs.beforeFirst(); // not rs.first() because the rs.next() below will move on, missing the first element
}
userVO.setTotalRecordCount(rowcount);
System.out.println("Total count of the records to be used for pagination >> "+rowcount);
rowcount = 0;
while(rs!=null && rs.next())
{
rowcount ++;
UserVO returnVO = new UserVO();
returnVO.setAppUsrId(rs.getInt("APPL_USR_ID"));
returnVO.setAppUsrNm(rs.getString("APPL_USR_NM"));
returnVO.setAppUsrFirstNm(rs.getString("APPL_USR_FRST_NM"));
returnVO.setAppUsrLastNm(rs.getString("APPL_USR_LST_NM"));
if (rs.getString("ACCESS_ROLE_CD")!=null && rs.getString("ACCESS_ROLE_CD").trim().equalsIgnoreCase(CAPConstants.ADMINISTRATOR_ROLE_CD))
returnVO.setApplicationLevelRole("Administrator");
else if (rs.getString("ACCESS_ROLE_CD")!=null && rs.getString("ACCESS_ROLE_CD").trim().equalsIgnoreCase(CAPConstants.MAINTAINER_ROLE_CD))
returnVO.setApplicationLevelRole("Maintainer");
else if (rs.getString("ACCESS_ROLE_CD")!=null && rs.getString("ACCESS_ROLE_CD").trim().equalsIgnoreCase(CAPConstants.VIEWER_ROLE_CD))
returnVO.setApplicationLevelRole("Viewer");
else
returnVO.setApplicationLevelRole("None");
returnList.add(returnVO);
System.out.println("Row count >>"+rowcount);
if(rowcount == CAPConstants.PAGINATION_MAX_VALUE)
break;
}
rowcount = 0;
userVO.setReturnListFromDB(returnList);
}
System.out.println("returnList >>"+returnList);
return userVO;
} catch (Throwable e) {
e.printStackTrace();
logger.writeToTivoliAlertLog(className, CAPConstants.ERROR, methodName, userVO.getAppUsrNm(), "Error occured while trying to fetch application user details. Printing stack trace to the log for analysis..", e);
throw new CAPDAOException("Error occured while trying to fetch application user details.",CAPException.SPEXECUTION_ERROR_CODE);
}
finally{
closeTransactionAndSession(session,transaction);
}
}
MYSQL 查询 -
SELECT APPL_USR_ID,APPL_USR_NM,APPL_USR_FRST_NM, APPL_USR_LST_NM,ACCESS_ROLE_CD
FROM APPL_USR WHERE APPL_USR_NM LIKE '%'
AND APPL_USR_FRST_NM LIKE '%'
AND APPL_USR_LST_NM LIKE '%'
AND APPL_USR_ID != 1
ORDER BY APPL_USR_ID
LIMIT 10, 10