Java 请回答nks，但您能否在第一种方法中澄清什么是processList（列表）？作为sb变量，你指的是列表？我有点困惑，processList只是一个想象中的方法，你可以用它做任何其他事情。看起来我用错了sb的名字。我会修好的。 String query=

---

请回答nks，但您能否在第一种方法中澄清什么是processList（列表）？作为sb变量，你指的是列表？我有点困惑，

processList

只是一个想象中的方法，你可以用它做任何其他事情。看起来我用错了sb的名字。我会修好的。

String query= "SELECT * FROM myTable";
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(query);
ResultSetMetaData rsmd = rs.getMetaData();
// how many columns it the table
int columnsNumber = rsmd.getColumnCount();
List<String> list = new ArrayList<String>();

            while (rs.next()) {
              for(int i=0;i<columnsNumber;i++){

                String row= ""
                String row= row + " "+ rs.getString(i);

            }

 list.add(row);
}

Integer limit = 50000;
Integer offset = 0;
String query= "SELECT COUNT(*) as total FROM myTable";
Statement st = conn.createStatement();
ResultSet rs = st.executeQuery(query);
Integer total = rs.getInt("total");
Integer itrCount = (int) Math.ceil((double) total/limit);

for(int i=0; i< itrCount; i++){
    String query1 = "SELECT * FROM myTable limit " + limit + " offset " + offset;
    Statement st1 = conn.createStatement();
    ResultSet rs1 = st1.executeQuery(query1);
    ResultSetMetaData rsmd =  rs1.getMetaData();
    int columnsNumber = rsmd.getColumnCount();
    List<String> list = new ArrayList<String>();

    while (rs1.next()) {
      for(int i=0;i<columnsNumber;i++){
            String row= ""
            String row= row + " "+ rs1.getString(i);
       }

       list.add(row);
    }        

    offset += limit;

    // do something with your list
}

int limit = 50000;
String sql = "select * from myTable";
PreparedStatement statement = conn.prepareStatement(sql);
ResultSet rs = statement.executeQuery();
int columnCount = rs.getResultSetMetaData().getColumnCount();
List<String> list = new ArrayList<String>();
while (rs.next()){
  if (list.size() == limit){
     processList(list);
     list = new ArrayList<String>();
  }
  StringBuilder row = new StringBuilder();
  for (int i=1; i <= columnCount; i++){ 
    row.append(rs.getString(i));
  }
  list.add(row.toString());
}
processList(list);

select * from
  (select ordered.*, rownum as r
   from (select * from myTable order by ... ) ordered
  ) where r >= 0 and r < 50000

int batchSize = 50000;
String sql = "select * from "
  + " (select ordered.*, rownum as r "
  + " from (select * from myTable order by ... ) ordered "
  + " ) where r >= ? and r < ? ";
PreparedStatement ps = conn.prepareStatement(sql);
int lowerBound = 0;
boolean keepTryingQuery = true;
while (keepTryingQuery){
  List<String> list = new ArrayList<String>();
  upperBound = lowerBound + batchSize;
  ps.setInt(1, lowerBound);
  ps.setInt(2, upperBound);
  ResultSet rs = ps.executeQuery();
  int columnCount = rs.getResultSetMetaData.getColumnCount();
  while (rs.next()){
    StringBuilder row = new StringBuilder();
    for (int i = 1; i <= columnCount; i++){
      row.append(rs.getString(i));
    }
    list.add(row.toString());
  }      
  processList(list);
  keepTryingQuery = list.size() > 0;
  lowerBound = upperBound;
}