Java Tutorial/Database/ResultSet Concurrency

Get ResultSet Concurrency

   <source lang="java">

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_INSENSITIVE,
       ResultSet.CONCUR_UPDATABLE);
   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 = conn.createStatement();
   ResultSet rs = st.executeQuery("SELECT * FROM survey");
   int rsConcurrency = rs.getConcurrency();
   if (rsConcurrency == java.sql.ResultSet.CONCUR_READ_ONLY) {
     System.out.println("java.sql.ResultSet.CONCUR_READ_ONLY");
   } else if (rsConcurrency == java.sql.ResultSet.CONCUR_UPDATABLE) {
     System.out.println("java.sql.ResultSet.CONCUR_UPDATABLE");
   } else {
     // it is an error
   }
   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", "");
 }

}</source>

java.sql.ResultSet.CONCUR_READ_ONLY

ResultSet Concurrency

1. Result sets have one of two concurrency types.
2. A read-only result set is of type ResultSet.CONCUR_READ_ONLY,
3. An updatable result set is of type ResultSet.CONCUR_UPDATABLE.

The java.sql.Connection interface has nine methods that set the result set concurrency. The default value (which is CONCUR_READ_ONLY).