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Writing to database

Posted on 2011-09-28
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Last Modified: 2012-05-12
I have colums
Varchar , Date, varchar

I run this:

 public boolean registerFlight(String flightNo, String date, String planeName) {

        int val = 0;
            try {
                  val = mStmt.executeUpdate("INSERT INTO flight(flFligtNo, flDDate, flName) VALUES('"+flightNo +"," +date +"," +planeName +"'");



I get this:


com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1
      at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
      at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)


Do you see the error because I cant spot it.
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Question by:Mickeys
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20 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 36719199

Plane name is most probably string, so you need tyo add single quotes like that (at least you don't have single qouote befpre it in the snippet above )

 val = mStmt.executeUpdate("INSERT INTO flight(flFligtNo, flDDate, flName) VALUES('"+flightNo +"," +date +",'" +planeName +"' "); 

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LVL 47

Expert Comment

by:for_yan
ID: 36719207
The format of the date is a sepatare question - printourt how your date looks and I can check if it goes wit oracle or you need to do to_date(...)
0
 

Author Comment

by:Mickeys
ID: 36719290
I run mysql

2011-01-11
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Author Comment

by:Mickeys
ID: 36719304
running the above code makes it:


com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'Hera'' at line 1
      at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

So you are probably right about the date. :-/
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LVL 47

Expert Comment

by:for_yan
ID: 36719315

then you should use this with Orcale:

to_date('2011-01-11','YYYY-MM-DD')
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Expert Comment

by:for_yan
ID: 36719325
 val = mStmt.executeUpdate("INSERT INTO flight(flFligtNo, flDDate, flName) VALUES('"+flightNo +",to_date('" +date +"','YYYY-MM-DD'),'" +planeName +"' "); 

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Expert Comment

by:for_yan
ID: 36719334
Sorry, I forgot that you are on MySQL (there is simpulatneously anotythe question about Oraclele)- it may require different date format
0
 

Author Comment

by:Mickeys
ID: 36719378
yes it is.

I tried google but so far no luck
0
 
LVL 47

Accepted Solution

by:
for_yan earned 2000 total points
ID: 36719407
It looks like YYYY-MM-DD is defaul formatof the date for MySQL, so it should understand your date  in this way:

 val = mStmt.executeUpdate("INSERT INTO flight(flFligtNo, flDDate, flName) VALUES('"+flightNo +",'" + date +"','" +planeName +"' "); 

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0
 

Author Comment

by:Mickeys
ID: 36719418
I dont know if I am on the right track but I wrote this but it doesnt work correctlly yet. So I first need to fix this method

public void StringToDate ()
         {
        try {  String str_date="2011-01-01";
        DateFormat formatter ;
        Date date ;
         formatter = new SimpleDateFormat("yyyy-MMM-dd");
         date = (Date)formatter.parse(str_date);  
        System.out.println("Today is " +date );
         } catch (ParseException e)
         {System.out.println("Exception :"+e);  }  
        
        }




Exception :java.text.ParseException: Unparseable date: "2011-01-01"
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Expert Comment

by:for_yan
ID: 36719421


I read here:
http://www.tizag.com/mysqlTutorial/mysql-date.php

the forllowing:

The default way to store a date in MySQL is with the type DATE. Below is the proper format of a DATE.

    YYYY-MM-DD
    Date Range: 1000-01-01 to 9999-12-31
0
 
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Expert Comment

by:for_yan
ID: 36719432
But this is another story - this is about SimpleDateFormat

I think you have one extra "M" - you should have

      formatter = new SimpleDateFormat("yyyy-MM-dd");

let me try
0
 

Author Comment

by:Mickeys
ID: 36719434
Hmmm I found the error. One M to much in MMM

Now I get this

Today is Sat Jan 01 00:00:00 CET 2011


So I guess this wont work
0
 
LVL 47

Expert Comment

by:for_yan
ID: 36719458
This worked for me :

     SimpleDateFormat   formatter = new SimpleDateFormat("yyyy-MM-dd");

        java.util.Date ddm = formatter.parse("2011-01-11", new ParsePosition(0));

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Author Comment

by:Mickeys
ID: 36812931
well works yes but it dont gets to the correct date. The output is this:

Today is Sat Jan 01 00:00:00 CET 2011

when the output should be 2011-01-01

So I guess this is the wrong method.

So I think I need something else.

The big question is HOW can I make this to_date('2011-01-11','YYYY-MM-DD')  work with mysql?
0
 
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Expert Comment

by:for_yan
ID: 36812943

This will give you the output which you want, but I don't understand what is your goal
You had str_date in the first place in this format?
public void StringToDate ()
         {
        try {  String str_date="2011-01-01";
        DateFormat formatter ;
        Date date ;
         formatter = new SimpleDateFormat("yyyy-MMM-dd");
         date = (Date)formatter.parse(str_date);  
        System.out.println("Today is " + formatter.format(date) );
         } catch (ParseException e)
         {System.out.println("Exception :"+e);  }  
        
        }

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LVL 47

Expert Comment

by:for_yan
ID: 36812951


And why do you need " how to_date('2011-01-11','YYYY-MM-DD')  work with mysql?"

Did it work this way without error ?


 val = mStmt.executeUpdate("INSERT INTO flight(flFligtNo, flDDate, flName) VALUES('"+flightNo +",'" + str_date +"','" +planeName +"' ");

where str_date = "2011-01-01" ?

Did you try it this way?

0
 
LVL 47

Expert Comment

by:for_yan
ID: 36812956


When you use this operator:
     System.out.println("Today is " +date );

and date is instance of java.util.Date it will use the toString() method of Date
and it prints the same date but with hours, day of the week, etc.

If you want to print it in  different format you need to use SimpleDateFormat to format it the way you want

But if you want to print it the same wy you had it formatted originally,
then there is no reason to parse it first to a Date and the fomrat it again to the  same string
0
 

Author Closing Comment

by:Mickeys
ID: 36812983
Needed a little tweek.

Replaced - with / in my date string and then this

val = mStmt.executeUpdate("INSERT INTO flight(flFlightNo, flDDate, flName) VALUES('"+flightNo +"',STR_TO_DATE('" +date +"','%Y/%m/%d'),'" +planeName +"' "+")");
0
 
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Expert Comment

by:for_yan
ID: 36812991
Great, that  it worked.
0

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