JDBC之ResultSet

ResultSet is a interface
More gnerally,ResultSet is a class involves a table returned by executeQuery cluase from jdbc,which includes the whole information we wanna get from our query,however if we want to retrive these info in java applet ,jdbc provides us a cursor.Let's see how Java API explain it
JDBC之ResultSet
After reading this explanation , we can understand the meaning of whlie (rs.next()) {...}
 JDBC之ResultSet
In the while loop,we use cursor to access each row,but here comes the problem:how could we convert the underlying data in the set pointed by cursor to Java type?Here are the explanation from Java API:
JDBC之ResultSet
 JDBC之ResultSet
We must provide a parameter to getter methods we invoke,which stands for the column that we wanna get information from.As for the parameter,API also give us some details about it.Let's take a look at it:
JDBC之ResultSet
 JDBC之ResultSet
The last thing I think that our attention should be paid to is that the lifecycle of the ResultSet
JDBC之ResultSet
 JDBC之ResultSet
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