SQL Queries in Java

I am trying to do a SQL query to look into a table and see if a name already exists in the table, and if it doesn't then I want to add in that name. Here is what I have:
ResultSet result = statement.executeQuery("SELECT EventName FROM Items WHERE EventName=" +event.getEventName());
Now if the event name is not in the table, then I want to add it. But unforuately this line throws an SQLException error. I am thinking this is because the table I am quering is empty and it does not find the event name I am looking for. I was wondering if anyone knew how to get around this.
Thanks.

Now I am gettting a Syntax error on my INSERT Into
Statement. Here it is:
"INSERT INTO Items(EventName, Location, Price,
TotalQuantity, Date) VALUES ('" + event.getEventName()
+ "', '" + event.getLocation() + "', '" +
event.getPrice() + "', '" +
event.getTotalTicketQuantity() + "', '" +
event.getEventDate() + "')";
Not sure why. Items is my table. Here is my code too:
statement.executeUpdate(insert);I wouldn't expect columns which get filled with price, quantity and EventDate to be character columns. So why do you quote the values with single quotes?

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Performing sql queries in java without using java libraries

i wonder whether its possible to perform sql queries beginning from create table to updating queries without using the java sql library.
has anyone written such code.

You could use JNI to talk to a native driver like the Oracle OCI driver. Doing this is either exiting or asking for trouble depending on your attitude to lots of low level bugs.

SQL Queries from Java to Access

Does anyone know why it is that when i send a SQL query from a Java class to Access using the equals ( = ) function, it works fine, but when i send a query using the LIKE function, it does not work?
If i manually copy and paste the LIKE query from Java into an Access query, the query works fine yet when i send it from the Java class, it does not work.
An ideas would be most welcome

Access uses a different token for the %-sign (a * I believe). When you want to do a 'like-query' through JDBC, you have to use the %-sign:
LIKE '%text_to_search%'

Parameterised SQL queries in Java

Hiya,
Please can someone help?
I have a simple mysql database which is accessed through a java app.
At the moment the code I have allows the user to select a parameter for the query from a drop down box on the gui, from data already in the database.
I would like the user to be able to input their own parameter or partial parameter.
Eg entries can be identified by an accession number AAH14253, BCC62738, ZP_536498, AAC54628 etc.
I would like the user to be able to enter just AA and it would bring up all entries of this type. Is this possible?

well u can use a query like-----
PrepaaredStatement stmt=con.prepareStatment(select * from students where name =?");
stmt.setString(1,textNAME.getText()+"%");
execute this query....
hope u can do it...now

Convert SQL statements to JAVA Code ?

Using SQL queries Can I convert SQL statements to JAVA Code ?
Edited by: user11238895 on Jun 7, 2009 10:54 PM
Edited by: user11238895 on Jun 7, 2009 11:12 PM

Me very new to Oracle.
can we convert SQL Queries to JAVA Code using simple built in SQL queries ?
Which SWISS SQL Tool does [Converting SQL Queries to JAVA Code]

SQL Queries in Code V/s Stored Procedures

Hi Friend,
Can any one of you guide me with following..
What is faster ? using SQL Queries in Java code or using Stored Procedures which are called from code?
I understnd Stroed Procedures are faster and definitely it provides more maintainability.
If any one can give me any links or resources which outlines pros and cons of using Stored Proc and SQL Queries embedded in Java than it would be a great help..
If there are any articles which proves either of the above is a preferred way, that would also help..
Appreciate the effort in advance !!
Thanks
Gurudatt

Well one benefit of Stored Procs is that you "compile" it on the database whereas you might build your query on the fly in java... test coverage is important in order not to have such things as a typo in a column name....
Still, if you change a table, you have to go through all the procedures in SQL and likely to do so in some of your business object... and trust me, that can be hell!
It all depends on the use of the app...
From my experience, Stored procedure are much faster than built-on-the-fly SQL (and quite faster than prepared statements depending on the JDBC driver, the re-use of connections etc...)....
IMHO, you'd probably be wise to start of with prepared statements, and when the schema seems stable enough (ie unlikely to change), look for the slower queries and convert them to stroed procedures.
If you don't have to support several databases and are tight on performance, you can even include some logic in your stored procedure (e.g. update several tables, based on various selects...etc...). The language is usually quite powerful, and that can save you the run-time of selecting, converting to object , process and update (i.e. several roud-trip between DB and app)...
Tshcuss!
Chris

How to write a JAVA program to execute the SQL queries

I have a database in the Microsoft Access queries and I need to execute the query by some how write the Java program to make it execute the query. because I need to get the different of time so I know how fast each query run.
Thank you

You need jdbc-driver for MSAccess for run this example:
JDBCClient.java
import java.util.Properties;
import java.lang.String;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.BufferedOutputStream;
import java.lang.System;
import java.lang.Class;
import java.sql.SQLException;
import java.util.Date;
import java.util.Locale;
import java.text.DateFormat;
import java.sql.Time;
public class JDBCClient{
    private String DriverName = new String();
    private String DatabaseURL = new String();
    private String UserName = new String();
    private String Password = new String();
    private String SQLFile = new String();
    private String OutputFile = new String();
    private String Separator = new String();
    private boolean NeedColumnHeaders;
    private String EncodingParamName = new String();
    private String EncodingValue = new String();
    private String OutputEncoding = new String();
    private boolean AfterLastColumnSeparator;
    JDBCClient( String propfilename){
     System.out.println( "Initializing...");
     Properties properties = new Properties();
     try{
         properties.load( new FileInputStream( propfilename));
     catch( Exception e){
             System.out.println( "Error: " + e.toString());
         System.exit( 0);
     DriverName = properties.getProperty( "DriverName");
     DatabaseURL = properties.getProperty( "DatabaseURL");
     UserName = properties.getProperty( "UserName");
     Password = properties.getProperty( "Password");
     SQLFile = properties.getProperty( "SQLFile");
     OutputFile = properties.getProperty( "OutputFile");
     Separator = properties.getProperty( "Separator");
     if( properties.getProperty( "NeedColumnHeaders").compareToIgnoreCase( "yes") == 0 ||
         properties.getProperty( "NeedColumnHeaders").compareToIgnoreCase( "true") == 0)
         NeedColumnHeaders = true;
     else
     if( properties.getProperty( "NeedColumnHeaders").compareToIgnoreCase( "no") == 0 ||
         properties.getProperty( "NeedColumnHeaders").compareToIgnoreCase( "false") == 0)
         NeedColumnHeaders = false;
     else{
             System.out.println( "Invalid value for \"NeedColumnHeaders\" property (logical expected)");
         System.exit( 0);
     EncodingParamName = properties.getProperty( "EncodingParamName");
     EncodingValue = properties.getProperty( "EncodingValue");
     OutputEncoding = properties.getProperty( "OutputEncoding");
     if( properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "yes") == 0 ||
         properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "true") == 0)
         AfterLastColumnSeparator = true;
     else
     if( properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "no") == 0 ||
         properties.getProperty( "AfterLastColumnSeparator").compareToIgnoreCase( "false") == 0)
         AfterLastColumnSeparator = false;
     else{
             System.out.println( "Invalid value for \"AfterLastColumnSeparator\" property (logical expected)");
         System.exit( 0);
     try{
         byte[] EOL = new byte[2];
         EOL[0] = 13;
         EOL[1] = 10;
         Class.forName( DriverName);
         Properties connInfo = new Properties();
         connInfo.put( "user", UserName);
         connInfo.put( "password", Password);
         if( EncodingParamName.length() != 0 && EncodingValue.length() != 0)
          connInfo.put( EncodingParamName, EncodingValue);
             Connection connection = DriverManager.getConnection( DatabaseURL, connInfo);
         FileInputStream in = new FileInputStream( SQLFile);
         byte[] buffer = new byte[in.available()];
         in.read( buffer);
         in.close();
         String SQL = new String( buffer);
             PreparedStatement statement = connection.prepareStatement( SQL);
         Date d1 = new Date();
             System.out.println( "Database connected at " + d1 + " Executing statement...");
            ResultSet resultSet = null;
         if( statement.execute())
          resultSet = statement.getResultSet();
         else{
              System.out.println( "Script updates " + statement.getUpdateCount() + " records.");
          System.exit( 0);
             ResultSetMetaData metaData = resultSet.getMetaData();
             BufferedOutputStream out = new BufferedOutputStream( new FileOutputStream( OutputFile));
         if( NeedColumnHeaders && metaData.getColumnCount() > 0){
          String head = new String();
          for( int i = 1; i < metaData.getColumnCount(); i++)
              head += metaData.getColumnName( i) + Separator;
          head += metaData.getColumnName( metaData.getColumnCount());
          out.write( head.getBytes( OutputEncoding), 0, head.length());
          out.write( EOL, 0, 2);
         String record = new String();
         while( resultSet.next()){
          record = "";
          for( int i = 1; i < metaData.getColumnCount(); i++)
              record += resultSet.getString( i) + Separator;
          record += resultSet.getString( metaData.getColumnCount());
          if( AfterLastColumnSeparator)
              record += Separator;
          out.write( record.getBytes( OutputEncoding), 0, record.length());
          out.write( EOL, 0, 2);
         out.close();
         Date d2 = new Date();
             System.out.println( "Done at " + d2);
             System.out.println( "Executing time " + new Time( d2.getTime() - d1.getTime() - 10800000));
     catch( ClassNotFoundException e){
             System.out.println( e.toString());
     catch( SQLException e){
             System.out.println( e.toString());
     catch( java.io.IOException e){
             System.out.println( e.toString());
     System.exit( 0);
    public static void main( String args[]){
     if( args.length == 1)
         new JDBCClient( args[0]);
     else
         System.out.println( "Usage JDBCClient <properties_file>");
}JDBCClient.properties ( for Oracle database)
DriverName=oracle.jdbc.driver.OracleDriver
DatabaseURL=jdbc:oracle:thin:@192.168.1.1:1521:test
UserName=test
Password=test
SQLFile=test.sql
OutputFile=test.csv
Separator=*
NeedColumnHeaders=yes
EncodingParamName=
EncodingValue=
OutputEncoding=windows-1251
AfterLastColumnSeparator=yestest.sql
select * from users;

Retrieving SQL queries used in BO reports using BO Java SDKs

Hi,
Is it possible to retrieve SQL queries generated by Canned Reports? I have 200+ reports saved in my local system and i need to retrieve SQL queries from them, this is required for documentation purpose. Please let me know if it is possible thru BO java SDKs.

This is the code I am using to retrieve the SQL values.
IEnterpriseSession boEnterpriseSession = null;
              boEnterpriseSession = CrystalEnterprise.getSessionMgr().logon( boUser, boPassword, boCmsName, boAuthType);
               // Get the Report Application Factory service from Crystal Enterprise
               IReportAppFactory rptAppFactory = (IReportAppFactory)boEnterpriseSession.getService("", "RASReportService");
               // Get the InfoStore service from Crystal Enterprise
               IInfoStore boInfoStore = (IInfoStore)boEnterpriseSession.getService("", "InfoStore");
               // Retrieve the report by name from Crystal Enterprise
               IInfoObjects boInfoObjects = boInfoStore.query("Select SI_ID From CI_INFOOBJECTS Where SI_NAME = '" + reportName + "'");
               // Open the report into a Report Document object
               ReportClientDocument rcd = rptAppFactory.openDocument((IInfoObject)boInfoObjects.get(0), 0, Locale.ENGLISH);
               System.out.println("SQL query \n \n");
               System.out.println(rcd.getRowsetController().getSQLStatement(null, ""));
I am a newbie and I dont understand where the error lies.. Please help me out.
regards,
nitin
When run the code gives the following errors
com.crystaldecisions.sdk.occa.managedreports.ras.internal.ManagedRASException: Cannot open report document. --- 0x80004005
Unspecified error
cause:com.crystaldecisions.sdk.occa.report.lib.ReportSDKServerException: 0x80004005
Unspecified error---- Error code:-2147467259 Error code name:failed
detail: 0x80004005
Unspecified error
     at com.crystaldecisions.sdk.occa.managedreports.ras.internal.RASReportAppFactory.a(Unknown Source)
     at com.crystaldecisions.sdk.occa.managedreports.ras.internal.RASReportAppFactory.a(Unknown Source)
     at com.crystaldecisions.sdk.occa.managedreports.ras.internal.RASReportAppFactory.openDocument(Unknown Source)
     at com.crystaldecisions.sdk.occa.managedreports.ras.internal.RASReportAppFactory.openDocument(Unknown Source)
     at com.hcl.BO.retrieveSql.RetrieveSQL.main(RetrieveSQL.java:44)
Caused by: com.crystaldecisions.sdk.occa.report.lib.ReportSDKServerException: 0x80004005
Unspecified error---- Error code:-2147467259 Error code name:failed
     at com.crystaldecisions.sdk.occa.report.lib.ReportSDKServerException.throwReportSDKServerException(Unknown Source)
     at com.crystaldecisions.proxy.remoteagent.s.a(Unknown Source)
     at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.if(Unknown Source)
     at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.if(Unknown Source)
     at com.crystaldecisions.sdk.occa.report.application.ReportClientDocument.a(Unknown Source)
     at com.crystaldecisions.sdk.occa.report.application.ClientDocument.open(Unknown Source)
     ... 4 more
I am a newbie and

Recursive Java programming method for executing recursive SQL queries

Anybody has a Java/JDBC example method to execute recursive SQL queries and print results? The method has to work for any number of queries and levels and the first query passes the parameter to the second query.
Edited by: user4316962 on Jun 12, 2011 1:59 PM

user4316962 wrote:
Guys, the problem what I am trying to solve is much more complex and I don’t think SQL level recursion is enough. I am looking for Java solution with SQL queries in it to make it more flexible and DB independent.
If you want to do recursion in SQL then it has nothing to do with Java.
And if you want to do recursion in Java then the idiom itself has nothing to do with SQL.
Other than that you have provided enough detail for anyone to even guess at what you are asking.
As a start I am not even sure that you understand what recursion is nor how JDBC works. (But it could be that you are using the terms to mean something else.)
And looking at your original post it could be nothing more than that you are looking for a design pattern - perhaps the interpreter.

SQL Queries changes from Java 6 beta2 to Java6 RC

Hi All,
I was using new classes and annotations for database access, like java.sql.BaseQuery, java.sql.Select in Java 6 beta2.
I've just upgraded to Java 6 RC and...oops these classes cannot be found? What is changed? How can I refactor my application?
Thanks in advance,
Antonio

there's nothing about that in the release notes...
google result's on sun's site are 404...
bad luck

Need help in SQL Queries using GUI controls or variables

Hello, all
I have a big problem (I have already had with Visual Basic a few mounths ago) with Java while writing my SQL Queries.
I would like to know how I must do to use variable data or GUI control data in my SQL Query to select only some records.
Here, my first Query that works without any problem (no WHERE clause !!!) :
Statement requeteBedes = connectBedes.createStatement();
ResultSet resultatSeries = requeteBedes.executeQuery("SELECT * FROM Series");
initComboBoxSeries(resultatSeries);the method "initComboBoxSeries" fills a JComboBox with all the names of the series in my database.
Here comes my problem.I would like to use the value of the selected "series" in the JComboBox to search in another table of the same Database. I made another statement but it returns a Null ResultSet :
ResultSet resultatSearchAlbumsFromSeries = requeteBedes.executeQuery("SELECT * FROM bandes_dess WHERE ser_nom = '" + strComboBoxSeriesSelected + "' "); The variable strComboBoxSeriesSelected contains the value of the selected line in the combobox with all the series, filled after the first query that is here above and that works very well.
Could some one help me and tell me how I must use variables or GUI controls values in my SQL Queries or tell me if there is a place where I could find an explanation of that kind of problems (like more "advanced SQL Queries", as the ones currently used in all the Learning Java 2 books)
Thank you all for your help.
Christian.

executeQuery() will never return null. At least that's what the spec says. You are probably catching an exception (probably a syntax error caused by a single quote in strComboBoxSeriesSelected) and ignoring it. Or do you mean the ResultSet contains no rows?
Anyway, to use parameterized queries, take a look at PreparedStatements. Your code should look like this using PreparedStatement:Statement requeteBedes = connectBedes.prepareStatement("SELECT * FROM bandes_dess WHERE ser_nom = ?");
requeteBedes.setString(1, strComboBoxSeriesSelected);
ResultSet resultatSeries = requeteBedes.executeQuery();Alin.

Executing SQL command in Java on Linux OS

when i am running a java class file from cmd line,
in that java file i am using a SQL statement, like
select * from emp where empname='uday'
here its not accepting the single quote('), its ignoring single quotes
can any one help me

when i am running a java class file from cmd line,
in that java file i am using a SQL statement, like
select * from emp where empname='uday'
here its not accepting the single quote('), its
ignoring single quotes
can any one help meIf you were using a prepared statement then this would be irrelevant. I suggest you take a look at one before you have to right some larger queries.
http://java.sun.com/docs/books/tutorial/jdbc/basics/prepared.html
http://www.javaworld.com/javaworld/jw-01-2002/jw-0125-overpower.html

SQL queries in JSP

Does anyone know how to create a JSP which allows the user to input data into a simple database and then allow the user to input SQL queries? I can do this in a servlet but must hard code the query. It would be great to be able to type in differnet queries to see the results.
Thanks
Michael

hai,
I am giving u a small example which allows user to enter data in the html page and the same is submitted by the Jsp page in the database.
<%@ page language="java" import="java.sql.*" %>
<html>
<body bgcolor="#FFd08d" >
<%!     Connection conn;
     Statement st,st1;
     ResultSet rs,rs1;
     int i,j;
%>
<%
     try{
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          conn=DriverManager.getConnection("jdbc:odbc:--DSNName--","--DataBaseUserName--","--DataBasePassword--");
     catch(Exception e)
%>
     Error in Saving : <%=e%>
<%
     try
     String email_address=request.getParameter("email_address");
     String query_text=request.getParameter("query_text");
     PreparedStatement st=null;
     String inst="insert into databasename..DataBaseTableName(email_address,query_text) values (?,?)";
     st=conn.prepareStatement(inst);
     st.setString(1,email_address);
     st.setString(2,query_text);
     st.executeUpdate();
     conn.close();
%>
Your query is Submitted.<br>
Thanks.
<%
     catch(SQLException e)
%>
Error in Saving : <%=e%>
<%
%>
</body>
</html>
I think this will solve ur query.
bye
sameer

Maintaining SQL Queries in a separate text file

Hi,
I am working on web based project using Spring MVC framework and I am maintaining all SQL queries in a separate text file so that I can change them any time when needed. I just want to know am I doing right, it this a optmistict way of coding??

>
I am working on web based project using Spring MVC framework and I am maintaining all SQL queries in a separate text file so that I can change them any time when needed. I just want to know am I doing right, it this a optmistict way of coding??
>
The best place to store the queries, and HOW to store them depends on your architecture and on how your application is being used.
Is this a single-user application on a user's pc? Or is your application located on an application server in the middle-tier?
The queries should be stored where they will be used. Your queries should be stored in the tier where your application code will reside. On the client PC for a single-user app, on the application server for a 3-tier app and incorporated into stored procedures/functions/packages if part of a database app.
If your application is totally external to the database (e.g. a reporting app) then it doesn't make sense for you to become part of the database architecture. An org isn't going to let you create objects in the database to store your queries when your queries are not part of the database application. That puts the burden on them to backup your objects, restore them for your and provide support to you and your application.
What format to store the queries in is a different issue. A major criteria is the type of queries you are using and how they are used. Many apps that query the database cannot just use hard-coded queries that are never modified. Users need to be able to provide parameters (e.g. name, ID, state, etc) to select just the data that they want.
That means the base query itself may not even be valid syntax but needs to have a WHERE clause added. Prepared statements and queries that use bind variables ('WHERE ID = ?') are typically used for these.
One method of storage is to use Java property files that use name=value pairs. Using property files makes it easy to use Java to find a query by name and load it for you. Then your code would have functionality to modify the query to provide the parameter 'bind' values and execute it.
There are also frameworks available for handling database related functionality. There is no need for you to write your own libraries for this. I suggest you locate a suitable framework to use.

SQL queries in JDBC log?

Hi all.
I am using CMP entity beans on Weblogic 7.0 and would like to see the SQL queries
which the EJB container is executing. I would think that I should be able to see
these in the JDBC log file, but all I see there is DB connection logging.
I've seen discussion in docs and various newsgroups that implies that these queries
should be logged in the JDBC log. Do I have to change some parameter in order
to see the SQL queries in the log file?
Thanks.
AL

I'm using Sybase 12.5 with JConnect 4.5. Since I posted my question, I've found
a suggestion to define weblogic.ejb20.cmp.rdbms.codegen.verbose=true on the java
command line when I'm booting WLS. I can now see queries (as well as a bunch of
other stuff) in the stdout of the weblogic server. But I would still like to have
the queries logged. Of course, I could redirect stdout, etc. But I thought there
should be another way, esp considering that the is a JDBC log file. Any suggestions
would be appreciated.
AL
Joe Weinstein <[email protected]> wrote:
>
>
AL wrote:
Hi all.
I am using CMP entity beans on Weblogic 7.0 and would like to see theSQL queries
which the EJB container is executing. I would think that I should beable to see
these in the JDBC log file, but all I see there is DB connection logging.
I've seen discussion in docs and various newsgroups that implies thatthese queries
should be logged in the JDBC log. Do I have to change some parameterin order
to see the SQL queries in the log file?For 7.0 we do not intercept, copy or log application SQL. Typically jdbc
logging
is left to the particular JDBC driver being used. Some drivers can be
very informative
or even over chatty, while others will log very little. What DBMS and
driver are you
using?
Joe
Thanks.
AL

SQL Queries in Java

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