What is the recommended method for escaping variables before inserting them into the database in Java?
As I understand, I can use PreparedStatement.setString() to escape the data, but PreparedStatement seems somewhat impractical ... |
I use
- Tomcat
- C3p0 (JNDI configured inside Tomcat)
- MySQL(InnoDB) / Derby(not embedded) as Database
- EHCache (in Memory)
- Hibernate
- Testmachine runs WinXP
I used Derby for development and wanted to switch to MySQL.
I was surprised to see, that with ... |
I have a problem in my code or connection I think...
I tried to connect to a MySQL database and web service, but when I run the program, it gives me the ... |
Presently, for each query, a Prepared Statement is created and reused. I am not using any connection pool. C3P0 is a widely recommended library for the same.
But, as a ... |
What is the best way to set up connection with mysql's jdbc?
And execute simple statement. How to do that?
Thank you.
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I have a machine running a java app talking to a mysql instance running on the same instance. the app
uses jdbc4 drivers from mysql. I keep getting com.mysql.jdbc.exceptions.jdbc4.CommunicationsException
at random ... |
Currently we are using 4 cpu windows box with 8gb RAM with MySQL 5.x installed on same box. We are using Weblogic application server for our application. We are targeting for ... |
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I have trying to check whether connection is valid or not and using isValid() method of java.sql.Connection. But this method doesn't return and hangs.
Is there anything I am missing or ... |
I have a java program running 24/7. It accesses mysql database every 3 seconds only from 9.am to 3.PM. In this case when should I should open and close the MySql ... |
My stack trace:
cbs.ui.OverallReportUI btnGenerateBillActionPerformed
SEVERE: null
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1055)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
...
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I am using MySQL 5.1 and my connector version is mysql-connector-java-5.1.7. I am getting following exception frequently. What is the issue?
Dec 24, 2009 10:29:20 AM org.apache.catalina.core.StandardHostValve status
WARNING: Exception Processing ErrorPage[errorCode=404, location=/error.jsp]
ClientAbortException: ...
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I am having issues trying to get a database connection using the code below:
try {
Class.forName("com.mysql.jdbc.Driver");
...
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My configuration files
project/WEB-INF/web.xml:
<resource-ref>
<description>ConnectionPool DataSource Reference</description>
<res-ref-name>jdbc/mysql</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>
project/WEB-INF/jetty-env.xml:
<New id="mysql" class="org.eclipse.jetty.plus.jndi.Resource">
<Arg></Arg>
<Arg>jdbc/mysql</Arg>
<Arg>
...
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I've ran through several examples over the web, and found that every single time I need something from the DB, I should write the following code:
try
{
// Step 1: Load ...
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I've been trying to get a c3p0 db connection pool configured for Jetty, but I keep getting a ClassNotFoundException:
2010-03-14 19:32:12.028:WARN::Failed startup of context WebAppContext@fccada@fccada/phpMyAdmin,file:/usr/local/jetty/webapps/phpMyAdmin/,file:/usr/local/jetty/webapps/phpMyAdmin/
java.lang.ClassNotFoundException: org.mortbay.jetty.webapp.WebAppContext
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
...
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i am writing stored procedures in MySQL that return values;
CREATE PROCEDURE getCustomerById (id int)
BEGIN
SELECT *
FROM customer
WHERE customer.id = id;
END;
and i get the error that the ... |
I am trying to connect to mysql from java web application in eclipse.
Connection con = null;
try {
//DriverManager.registerDriver(new com.mysql.jdbc.Driver());
Class.forName("com.mysql.jdbc.Driver");
...
|
I'm just getting my head around java (and OOP for that matter), the only thing I am familiar with is MySQL. I need to keep the DB connection open throughout the ... |
The output of netstat -an shows many mysql connections in CLOSE_WAIT state and when i checked the processlist in mysql using 'SHOW PROCESSLIST' the connections shown in netstat do not appear. ... |
I have one database. I executed a stored procedure on it. I wrote some JDBC code to connect to this database. When I am calling this stored procedure from my JDBC ... |
Is there anyway to check the Connection leakage in J2EE application ?
The application is running on my local machine. It uses MySQL database.
User Enters his details into the Database.
In my ... |
I get the following error when attempting to connect to the MySQL database on my employer's local server:
Unable to load database driver
Details : java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
BUILD ... |
From the examples that I have read and from the documentation on MysqlConnectionPoolDataSource at http://www.control.auc.dk/~04gr733/filer/javadoc-DB-driver/com/mysql/jdbc/jdbc2/optional/MysqlConnectionPoolDataSource.html it seems that Java SE applications cannot use connection pooling. Is this true? Can ... |
It's usually set to 60 seconds.
But I think con pool will hold the connection, so is there any conflict? Thank you.
|
I've tried to connect to mysql using DefaultHttpClient, but so far no success. Error connection refused.
I can telnet MySQL using telnet 127.0.0.1 3306
enter code here
I'am using this example from apache website
DefaultHttpClient ...
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I have a Java application running Win 7 connecting to MySQL on the same host. Eclipse IDE shows the following error every time after 8-10mins.
The ... |
I'm new to Java but even newer to java database connections. I've managed to create a database connection and query a table when I put it in the Main class. Now ... |
I want to write a JavaFX program with Database Connection(MYSQL). I did not know how to create a connection in program. And the methods I found on internet is not working ... |
import java.util.*;
import org.directwebremoting.util.Logger;
public class People
{
public People()
{
people = new HashSet();
random = new Random();
log.debug("Generating a new set of ...
|
I am getting this error:
FOR REAL Looking for database...
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The ...
|
Is it possible to make a Unix socket connection to MySql with Java to avoid JDBC's TCP/IP overhead?
Does anyone know a library (or a few libraries, perhaps) that makes this possible?
... |
I am using BasicDatasource in my application. This application is processing huge amount of raw data. Sometimes 1 query can take more than 15 minutes. (using mysql as db)
Here is my ... |
I am running a Spring MVC application, backed by a MySQL database which I am accessing using JDBC. I have been using the same code for a while, and have never ... |
i have a Java project connected to a MySQL database.
When I communicate between the two using executeQuery(query) everything seems to be fine with the encoding, BUT I have some autogenerated CRUD ... |
I can't seem to get a connection made on my Java program to java, I have started the MySQL Server, made a database in phpMyAdmin. But I'm confused on how I ... |
I have an application that connects to MySQL using JDBC. There are cases where the JDBC connection lies idle for hours (maybe even days) and its loosing its connection to ... |
Here is a part from my program:
try {
Class.forName("com.mysql.jdbc.Driver");
InitializeData data = new InitializeData();
...
|
I try to get some data form database. The connection method works for sure, but I have a problem getting any data form DB:
SQLConnect s = new ...
|
I just created a new project with NetBeans using the database template to connect to a MySQL database. After searching a while I got a question and hope anyone can help ... |
Was wondering why both Class.forName("com.mysql.jdbc.Driver"); and Class.forName("com.mysql.jdbc.Driver").newInstance(); work when i use them to connect to a database. By right, isn't the former not supposed to work, since no new instance was ... |
I'm running a database-heavy Java application on a cluster, using Connector/J 5.1.14. Therefore, I have up to 150 concurrent tasks accessing the same MySQL database. I get the following error:
Exception in ...
|
when using a connection pool,
will setting a connection's autocommit = false
affect this connection only?
if i close this connection without setting autocommit = true
and get a new connection will this connection's policy ... |
I am running my JAR file in linux (centos). All jar files work fine.
Now i am trying to connect to mysql server, but it gave me following
error.
Exception in thread "main" ...
|
Whenever I execute my code for accessing a database I get the following error:
:java.lang.ClassNotFoundException:
com.mysql.jdbc.DriverError
:java.lang.ClassNotFoundException:
com.mysql.jdbc.Driver
|
Our standard code section for using JDBC is...
Connection conn = getConnection(...);
Statement stmt = conn.conn.createStatement (ResultSet.TYPE_SCROLL_INSENSITIVE,
...
|
I am reviewing a big pile of existing code, trying to find unclosed connections that would cause the connection pool to run out or throw other erros.
In some places I see ... |
We are using a setup of JBoss 4.2.2.GA / Hibernate 3.2.4.sp1 / SpringMVC 2.5 / MySQL 5.0.27.
Below is the mysql-ds.xml file:
<datasources>
<local-tx-datasource>
<jndi-name>myDS</jndi-name>
<connection-url>jdbc:mysql://127.0.0.1:3306/database?zeroDateTimeBehavior=convertToNull&useConfigs=maxPerformance</connection-url>
...
|
Im trying to connect MYSQL db using Java where my SQL db is on localhost.
Im facing some issues regarding communication link failure.
public testfile() throws ClassNotFoundException, SQLException{
...
|
I am using CAS 3.4.5 on Apache tomcat 6 webserver with backend being mysql 5.1.37.
I am connecting from CAS which is written in Java spring framework to Backend using mysql-jdbc-connector version ... |
import java.sql.*;
public class MysqlConnect{
public static void main(String[] args) {
System.out.println("MySQL Connect Example.");
...
|
package cs352hw;
import java.sql.Connection;
import java.sql.DriverManager;
public class Main {
public static void main(String[] args) {
// TODO code application logic here
DB db ...
|
I am using Java+MySql. I am trying to add bulk data (around 40 million records). My application works fine for couple of hundred thousands records but after that it starts giving ... |
I am having a slight problem here.
basically I want to create a connection pool to DB using a class. This pool can be usable by other classes to execute queries. I ... |
I've been trying to get a c3p0 db connection pool configured for Jetty (7.4.1.v20110513), but I keep getting a java.lang.IllegalArgumentException :
C:\jetty7>java -jar start.jar
2011-05-29 00:29:51.843:INFO::jetty-7.4.1.v20110513
2011-05-29 00:29:51.875:INFO::Deployment monitor C:\jetty7\webapps at interval 1
2011-05-29 00:29:51.890:INFO::Deployable ...
|
My app seems to be hanging overnight because of the connection getting dropped(I think that's the problem.) How can I structure my app so that it can try to roll up ... |
I have created a simple database in MYSQL, which I am trying to pull data from in a java program written in Eclipse. When I run the program in eclipse, ... |
Hi I'm writing a java application which needs to create a persistent connection with a mysql database. I don't have access to the database server so I can't change anything on ... |
*UPDATE: I found a method which didn't close the session after openning. I think this might be the cause. Will test and report later. *
We are using MyBatis with our GWT ... |
How do you specify that the JDBC connection to mysql in the typical line
DriverManager.getConnection(url, username, password);
is via TCP?
Thanks
|
I am using the SphinxQL MySQL client which stores indexes as "tables" but has no real notion of a "database"...One specifies the port (9306 in my case) at which the sphinx ... |
I am still newbish to java development as I am mainly a C# developer. I'd like to know how to use or enable connection pooling when I do SQL requests from ... |
I think I need to understand the concept of connection pool a bit better. I'm working in java with ConnectorJ and I deploy my servlet on a Apache Tomcat server. I've ... |
i have installed MySql workbench. i want to create a database in MySql.
when i click New connection, it open a dialog, there are following default values:
- in connection method: there are ... |
Just curious, does a MySql connection with Broken Pipe or EOFException = null?
I'm asking cause it might be causing a logic error in my code. Or is there a way to ... |
How to connect MySQL db from another computer through internet. Where we can specify
the configurations. my.ini does not work?
|
I need help. I've got a Maven 3.0.3 project configured to run my webapp in Jetty for integration testing. The problem I'm having is that if I start jetty ... |
How do you specify that the JDBC connection to mysql in the typical line
DriverManager.getConnection("jdbc:mysql://mysql-o.sourceforge.net:4040/o582544_oopp", "user", "pass");
I requested the remote access from sourceforge but using the given port 4040 i no able ... |
I wrote my custom update handler for my solr installation, using jdbc to query a mysql database. Everything works fine: the updater queries the db, gets the data i need and ... |
I am using static variables pretty much heavily in my application. Now after the application status is finished I am facing a problem in garbage collection. The variables that are declares ... |
When i open a JDBC connection to a MySQL database i want to set some database server variable, so for example every time that a connection is established i want to ... |
I experienced some weird problem using MySQL connection pool in resin application server.
Earlier I used Connector-J supplied connection pool manager com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource in my web application.
I observed that upon concurrent connection ... |
I am connecting to MySQL in Java with Connector/J using Named Pipes. My connection and query are successful, but I am receiving a warning when I try to close the connection. ... |
I am trying to determine if I am actually using JDBC connection pooling. After doing some research, the implementation almost seems too easy. Easier than a regular connection in fact so ... |
Mysql run at GMT+8 but tomcat run at GMT.
when save datetime to database, seem run ok, when i check the datetime value in DB, i see the GMT value.
But when I ... |
I'm trying to connect to a mysql database from clojure. I'm using the example code taken from:
http://corfield.org/blog/post.cfm/connecting-clojure-and-mysql but I'm getting this error:
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
Last packet sent to the ...
|
Greeting, I've some problem with JDBC, it is so slow its unbeliveble.
Same code works perfect with Windows connection to a remote Database.
But with slackware, it takes like 30 seconds to connect, ... |
This is my first time try to connect to mysql using ipv6 host connection but it always return communication link failure. Can anyone suggest to me how to do that using ... |
DBCP let's you specify a min and max number for Idle connections See Link
I can't find a similar option in C3p0. I can specify a max and min pool ... |
SOLVED

Made my own dual familiar with the one on Oracle.
CREATE TABLE dual
(
x VARCHAR(1)
);
INSERT INTO dual(x) VALUES('y');
I have ... |
I am using logback and mysql like this:
<appender name="db" class="ch.qos.logback.classic.db.DBAppender">
<connectionSource class="ch.qos.logback.core.db.DataSourceConnectionSource">
<dataSource class="com.mchange.v2.c3p0.ComboPooledDataSource">
...
|
I am new to SOAPUI and have been trying to do query and procedure testing using SOAPUI.
I went through the SOAPUI documentation on net however I am not able to ... |
i am making a swing based desktop application that is initiated through a menu command in a runtime esclipe application.
- let me define the flow...
aC = main eclipse application project that ... |
I'm trying to connect to a server program i'm writing which I want it to connect to a MySQL DB and extract or insert information. I'm having a lot of trouble ... |
I have a very short Java application that just opens a connection to a remote MySQL database, reads some data, prints it, and exits. The most time-consuming part of the application ... |
The application I'm working on is a Java-based ETL process that loads data into multiple tables. The DBMS is Infobright (a MYSQL-based DBMS geared for data warehousing).
The data loading should be ... |
Hi NewJavaProgrammer! Welcome to bytes.com! ...However, when I use Java code to make a connection, I get the following exception message: Exception:com.mysql.jdbc.Driver I'm sure, that isn't the complete error you get, ... |
hi everyone,here is the way to connect to database from japplet on webpage if we are using netbeans ide the solution will be simple. just we need to sign the applet ... |
hiiii hello friends... pls help me.. me r new users to develop a new application with j2me using net beans IDE. pls help me to how to connect database with milet ... |
Hi. On my NetBeans database session, I have configured an MySQL instance. The instance is running. The configurations are correct. I have already commented the skip-network of my.cnf. I am in ... |
Hello everyone, I have an application in netbeans 6.8 to connect to Mysql when I get a series of mistakes, I need help because they can not find the error. thanks ... |
I am attempting to connect from Netbeans to MySL using the New Connection Dialog (from Services)IE NOT USING CODE.I have installed the connector. Following is the data filled in the dialog ... |
Hi, I cannot see the mysql under databases in netbeans. Here is the history of how my managed to get into trouble.. Initially I had earlier version of Netbeans installed. I ... |
Hi guys plz help me out, I've been googling this problem for two days and still don't have a clue I installed XAMPP and netbeans 6.9 on windows 7, the problem ... |
Please forgive my ignorance as I am new to learning these applications. I need help understanding how to create a database connection based on MY particular MAMP (Mac, Apache, MySQL, PHP) set up. Netbeans (6.9.1) and Zend Studio automatically creates the following as the database URL: jdbc:mysql://localhost:3306/database name This connection above finds old databases that I created but no longer use. ... |
public Connection conectar(String base) { try { Class.forName("com.mysql.jdbc.Driver").newInstance(); /*Stops when reach next line >>>*/ ... |
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at com.mysql.jdbc.Util.handleNewInstance(Util.java:409) at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1118) at com.mysql.jdbc.MysqlIO.(MysqlIO.java:343) at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2308) at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2122) at com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:774) at com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:49) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at com.mysql.jdbc.Util.handleNewInstance(Util.java:409) at ... |
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I use MySQL as my DB. When I did not schedule or fire a job for a long time, the DB connection will be closed. Then I get an exception: java.sql.SQLException: No operations allowed after connection closed.Connection was implicitly closed due to underlying exception/error: ** BEGIN NESTED EXCEPTION ** com.mysql.jdbc.CommunicationsException MESSAGE: Communications link failure due to underlying exception: ** BEGIN NESTED ... |
I have problem I run JDBC Request to myslql database when I put in filed : JDBC Driver class : com.mysql.jdbc.DriverI have in Jmeter.log : jmeter.protocol.jdbc.config.DataSourceElement: Could not load driver: com.mysql.jdbc java.lang.ClassNotFoundException: com.mysql.jdbc at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) ... |
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