阅读以下代码:
public class selectTable {
public static ResultSet rSet;
public static int total=0;
public static ResultSet onLoad_Opetations(Connection Conn, int rownum,String sql)
{
int rowNum=rownum;
int totalrec=0;
try
{
Conn=ConnectionODBC.getConnection();
Statement stmt = Conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
String sqlStmt = sql;
rSet = stmt.executeQuery(sqlStmt);
total = rSet.getRow();
}
catch(Exception e)
{
System.out.println(e.getMessage());
}
System.out.println("Total Number of Records="+totalrec);
return rSet;
}
}
下面的代码不显示实际总数:
total = rSet.getRow();
我的jTable显示4记录在jTable但总计= 0; 当我通过调试评估时,它显示:
total=(int)0;
而不是总数=(int)4如果我使用
rSet=last(); above from the code total = rSet.getRow();
总计显示准确值= 4但rSet什么都不返回.然后jTable是空的.告诉我!
我正在ResultSet查询Oracle查询.当我ResultSet在无限循环中迭代它时.
ResultSet rs = (ResultSet) // getting from statement
while (rs.next()) {
//
//
}
这个循环没有终止,所以我试着找到使用的记录数,rs.getFetchSize()并返回一个值10.我想知道这是否是找出ResultSet中记录数的正确方法,如果计数为10,为什么它会进入无限循环.请提出你的意见.
我有这个方法来获取一串行并打印它们.
另外,我要做while(Resultset.next())两次.第一个是获取行数,第二个是打印字符串.但是当方法第一次运行时Resultset.next(),方法会跳过第二次Resultset.next().
public static String[] gett() throws ClassNotFoundException, SQLException{
// this for get conneced to the database .......................
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:XE","hr","111");
Statement st = conn.createStatement();
ResultSet re = st.executeQuery("select location_id from DEPARTMENTS");
// Ok , now i have the ResultSet ...
// the num_row it's counter to get number of rows
int num_row = 0;
// this Arrar to store String values
String[] n = new String[num_row];
// this is the first …