我的代码有两个循环,对于外循环的第一行,我的外循环应该遍历内循环的所有行,而对于外循环的第二行,它应该遍历内排。
int y1,y2;
float t = 0,s1,s2;
while(rm.next())
{
int currentCol = 0;
cellNumber = new jxl.write.Number (currentCol++, currentRow, index, integerFormat);
index++;
sheet.addCell ( cellNumber );
cellLabel = new Label(currentCol++, currentRow, rs.getString("Name"));
sheet.addCell ( cellLabel );
y1 = rm.getInt("Year");
System.out.println("Year 1: " +y1);
cellNumber = new jxl.write.Number (currentCol++, currentRow, y1 , integerFormat);
sheet.addCell ( cellNumber );
s1 = rm.getFloat("Total_Price");
System.out.println("S1: "+s1);
while (rs.next())
{
y2 = rs.getInt("Year");
System.out.println("Year 2: " +y2);
s2 = rs.getFloat("Total_Price");
System.out.println("S2: " +s2);
if(y1==y2)
{
t = s1+s2;
System.out.println("Toatl Sales:" +t);
cellNumber = new jxl.write.Number (currentCol++, currentRow, t , priceformat);
sheet.addCell ( cellNumber );
}
}
int a = rs.getFetchDirection();
System.out.println("Direction: " +a);
rs.setFetchDirection(ResultSet.FETCH_REVERSE);
cellNumber = new jxl.write.Number (currentCol++, currentRow, s1 , priceformat);
sheet.addCell ( cellNumber );
currentRow++;
}
最佳答案
使用这个:
resultSet.beforeFirst()
来自文档:
Throws: SQLException - if a database access error occurs; this method is called on a closed result set or the result set type is TYPE_FORWARD_ONLY
关于java - 如何在循环 while 循环后将结果集重置为第一行,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/31880940/