在Java中,获得ResultSet的总行数的方法有以下几种。
第一种:利用ResultSet的getRow方法来获得ResultSet的总行数
- Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
- ResultSet rset = stmt.executeQuery("select * from yourTableName");
- rset.last();
- int rowCount = rset.getRow();
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rset = stmt.executeQuery("select * from yourTableName");
rset.last();
int rowCount = rset.getRow(); //获得ResultSet的总行数第二种:利用循环ResultSet的元素来获得ResultSet的总行数
- ResultSet rset = stmt.executeQuery("select * from yourTableName");
- int rowCount = 0;
- while(rset.next()) {
- rowCount++;
- }
ResultSet rset = stmt.executeQuery("select * from yourTableName");
int rowCount = 0;
while(rset.next()) {
rowCount++;
}rowCount就是ResultSet的总行数。
第三种:利用sql语句中的count函数获得ResultSet的总行数
- ResultSet rset = stmt.executeQuery("select count(*) totalCount from yourTableName");
- int rowCount = 0;
- if(rset.next()) {
- rowCount=rset .getInt("totalCount ");
- }
ResultSet rset = stmt.executeQuery("select count(*) totalCount from yourTableName");
int rowCount = 0;
if(rset.next()) {
rowCount=rset .getInt("totalCount ");
}rowCount就是ResultSet的总行数。
• Java中获得ResultSet的总列数是非常简单事情,因为Java中ResultSet提供了ResultSetMetaData工具类,ResultSetMetaData 是ResultSet的元数据的集合说明。
java获得ResultSet总列数的代码如下:
- Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
- ResultSet rset = stmt.executeQuery("select * from yourtable");
- ResultSetMetaData rsmd = rset.getMetaData() ;
- int columnCount = rsmd.getColumnCount();
Statement stmt = con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet rset = stmt.executeQuery("select * from yourtable");
ResultSetMetaData rsmd = rset.getMetaData() ;
int columnCount = rsmd.getColumnCount();columnCount 就是ResultSet的总列数。
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