First, then, last previous operation?

Hi experts,

am using the java code, one of the taken java ide supported. I need to get the first, next, previous, last data from the database...

I had a query. He performed time params. When I using the rs.first I came across the problem.

code follows...

package project1;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;


public class SMain {
    public static void main(String[] args) throws Exception {
    try {
    String url = "jdbc:oracle:thin:@xxx.xxx.x.xxx:1521:xxxx";
    String driver = "oracle.jdbc.driver.OracleDriver";
    String user = "xxx";
    String password = "xxx";
    Class.forName(driver);
    Connection connection = DriverManager.getConnection(url, user, password);
   
      PreparedStatement st = connection.prepareStatement("select  name , name1, name2 , name3 from table_name where nx = :1 ");
      st.setString(1, "x");
      ResultSet rs1 = st.executeQuery();
      rs1.first();
      String no = "1x : " + rs.getString(1) +  "2x: " + rs.getString(2) + "3x: " + rs.getString(3) + "4x: " +  rs.getString(4);
      System.out.println(quoteno);
      rs1.close();
      st.close();
    connection.close();
    } catch (Exception e) {
    System.err.println(e);
    }
    }
}

by using this code: get this error

java.sql.SQLException: invalid operation for the results before game only: first

of this code I don't get any error... value of the first row is
code follows.

package project1;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;


public class SMain {
    public static void main(String[] args) throws Exception {
    try {
    String url = "jdbc:oracle:thin:@xxx.xxx.x.xxx:1521:xxxx";
    String driver = "oracle.jdbc.driver.OracleDriver";
    String user = "xxx";
    String password = "xxx";
    Class.forName(driver);
    Connection connection = DriverManager.getConnection(url, user, password);
    Statement stmt = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
    ResultSet.CONCUR_READ_ONLY);
    String sqlQuery = "select name,name1,name2,name3 from table_name;
    ResultSet rs = stmt.executeQuery(sqlQuery);
    rs.first();
    String no = "1x : " + rs.getString(1) +  "2x: " + rs.getString(2) + "3x: " + rs.getString(3) + "4x: " +  rs.getString(4);
    System.out.println(no);
    }
    rs.close();
    stmt.close();
    connection.close();
    } catch (Exception e) {
    System.err.println(e);
    }
    }
}

{code}

different between two codes are prepared statement & statement with ResultSet.TYPE_SCROLL_INSENSITIVE.

i found out the doc regarding statement vs prepared statment here http://docs.oracle.com/javase/tutorial/jdbc/basics/processingsqlstatements.html

my need is so simple . i need to use run time parameters and also i should get the value of the first row using rs.first.

anyhowi understood what doc says.. am unable to complete my need. can anyone guide me...

>
Here, I summarize once again if you does me not correctly

first part of the code says

1 class preparedstatement with params
2. with the help of rs.first ().

Here I don't get out. stuck with the error.
>
Yes - and if you read the API for the method 'first' it tells you why you are getting this exception.

You cannot use the 'first' method if the result set type is TYPE_FORWARD_ONLY.

http://docs.Oracle.com/javase/6/docs/API/Java/SQL/ResultSet.html#first)
>
first
Boolean first()
throws SQLExceptionMoves the cursor to the first line of this ResultSet object.

Returns:
true if the cursor is on a line valid; False if there are no rows in the result set
Throws:
SQLException - access database error; This method is called on a closed result set or the result set type is TYPE_FORWARD_ONLY
SQLFeatureNotSupportedException - if the JDBC driver does not support this method
Since:
1.2
>
And even if you say that
>
so I jumped to the second part of the code.

second part of the code said.

1 statement with no params
2. with the help of rs.first ().

get out... but I need to pass the parameter it is important...
>
Yes - that works. But NOT because you have used a 'statement' instead of a 'preparedStatement.

This works because you used it

    Statement stmt = connection.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
    ResultSet.CONCUR_READ_ONLY);

The result set is TYPE_SCROLL_INSENSITIVE then, as the quote from the API above explains the method "first" don't will NOT raise an exception.

If you look at the summary of field at the top of the link I provided you will see this

static int TYPE_SCROLL_INSENSITIVE
          The constant indicating the type for a ResultSet object that is scrollable but generally not sensitive to changes to the data that underlies the ResultSet.

With the help of a constant will produce a result "scroll." You can use 'first', 'last' as you have seen him.

Has NOTHING to do with the statement against preparedStatement.

Tags: Java

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I have a query which can be simplified to the following data, if
Assume that it is my dataset, with THE_VALUE of
Sign (Anum) therefore,-1, 0 or 1.

* (Sorry for crushed registration. "I can't understand this website's rich text formatting.) *

THE_VALUE THE_DATE THE_MEMBER
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1 0 1 February 2007
1 0 1 March 2007
1. 1 April 1, 2007
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1. 1 July 1, 2007
1. 1 August 1, 2007
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3. 1 May 1, 2007
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3. 1 July 1, 2007
3. 1 August 1, 2007
3 0 01 - sep - 2007

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first_value (the_date)
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last_value (the_date)
during the last_date (PARTITION the_member, ORDER BY the_member the_value, the_date)
OF togola
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the_date;

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1. 1 May 1, 2007 April 1, 2007 may 1, 2007
1-0 June 1, 2007 January 1, 2007 June 1, 2007
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3. 1 August 1, 2007 February 1, 2007 August 1, 2007
3 0 01 - sep - 2007 1 January 2007 01-Sep-2007

That's what I need to get in the end.

THE_MEMBER FIRST DAY DATE OF LAST
July 2 1 2007-01 - Sep - 2007

Any ideas would be really appreciated.

Published by: user10700981 on December 17, 2008 13:57
Hello

We'll call the lines whose the_value =-1 'good' lines and lines with the_value! =-1 ranks of 'bad '.

For each value of the_value, we need the first and last values of the_date where
the last row in the group is good
(b) the current line is good
(c) there is a lot of lines from the current line to the end of the Group
Condition (a) is just a special case of (c).
Conditions (b) and (c) are similar: (b) if applied to the current line, (c) applies to all lines after him. They can easily be combined into a single test that counts the number of lines after the current line or bad.

Which produces the results you requested of the sample data that you provided:
```
WITH     count_bad     AS
(
     SELECT     the_member
     ,     the_date
     ,     COUNT     ( CASE
                    WHEN  the_value != -1 -- assuming the_value is never NULL
                    THEN  1
                 END
               ) OVER     ( PARTITION BY     the_member
                      ORDER BY     the_date     DESC
                    )     AS bad_cnt
     FROM     table_x
)
SELECT     the_member
,     MIN (the_date)     AS first_date
,     MAX (the_date)     AS last_date
FROM     count_bad
WHERE     bad_cnt     = 0
GROUP BY     the_member
ORDER BY     the_member;
```

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