Mega Code Archive
Create Statement and set the ResultSet type
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When creating a Statement object, you need to specify two arguments to the method
createStatement().
The first argument indicates the type of a ResultSet object:
ResultSet.TYPE_FORWARD_ONLY: cursor may move only forward
ResultSet.TYPE_SCROLL_INSENSITIVE: scrollable but generally not sensitive to changes made by others
ResultSet.TYPE_SCROLL_SENSITIVE: scrollable and generally sensitive to changes made by others
The second argument:
ResultSet.CONCUR_READ_ONLY: the concurrency mode that may not be updated
ResultSet.CONCUR_UPDATABLE: the concurrency mode that may be updated
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class Main {
public static void main(String[] args) throws Exception {
Connection conn = getConnection();
Statement st = conn.createStatement(
ResultSet.TYPE_SCROLL_SENSITIVE,
ResultSet.CONCUR_READ_ONLY);
st.executeUpdate("create table survey (id int,name varchar(30));");
st.executeUpdate("insert into survey (id,name ) values (1,'nameValue')");
st.executeUpdate("insert into survey (id,name ) values (2,null)");
st.executeUpdate("insert into survey (id,name ) values (3,'Tom')");
ResultSet rs = st.executeQuery("SELECT * FROM survey");
// extract data from the ResultSet scroll from top
while (rs.next()) {
String id = rs.getString(1);
String name = rs.getString(2);
System.out.println("id=" + id + " name=" + name);
}
System.out.println("---------");
// scroll from the bottom
rs.afterLast();
while (rs.previous()) {
String id = rs.getString(1);
String name = rs.getString(2);
System.out.println("id=" + id + " name=" + name);
}
rs.close();
st.close();
conn.close();
}
private static Connection getConnection() throws Exception {
Class.forName("org.hsqldb.jdbcDriver");
String url = "jdbc:hsqldb:mem:data/tutorial";
return DriverManager.getConnection(url, "sa", "");
}
}
id=1 name=nameValue
id=2 name=null
id=3 name=Tom
---------
id=3 name=Tom
id=2 name=null
id=1 name=nameValue
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