How do I manually configure a DataSource in Java

Question

I m trying to follow Sun s JDBC tutorial at http   java sun com docs books tutorial jdbc basics connecting html  It gives the following example code   DataSource ds    DataSource  org apache derby jdbc ClientDataSource   ds setPort 1527   ds setHost  localhost    ds setUser  APP   ds setPassword  APP     Connection con   ds getConnection      This code doesn t compile because the DataSource interface has none of these methods  except for the getConnection   method invoked last      Here s the javadoc   http   java sun com javase 6 docs api javax sql DataSource html   What am I missing   Edit  I m actually trying to connect to MySQL  com mysql jdbc  and I can t find the javadoc for that   I ll accept an answer that points me to either    1  documentation for com mysql jdbc regarding a DataSource that I can understand  or  2  gives an example to follow for what the tutorial s code should be  for any database

User · Answer

The javadoc for DataSource you refer to is of the wrong package. You should look at javax.sql.DataSource. As you can see this is an interface. The host and port name configuration depends on the implementation, i.e. the JDBC driver you are using.

I have not checked the Derby javadocs but I suppose the code should compile like this:

ClientDataSource ds = org.apache.derby.jdbc.ClientDataSource()
ds.setHost etc....

User · Answer

One thing you might want to look at is the Commons DBCP project  It provides a BasicDataSource that is configured fairly similarly to your example  To use that you need the database vendor s JDBC JAR in your classpath and you have to specify the vendor s driver class name and the database URL in the proper format   Edit   If you want to configure a BasicDataSource for MySQL  you would do something like this   BasicDataSource dataSource   new BasicDataSource     dataSource setDriverClassName  com mysql jdbc Driver    dataSource setUsername  username    dataSource setPassword  password    dataSource setUrl  jdbc mysql    lt host gt   lt port gt   lt database gt     dataSource setMaxActive 10   dataSource setMaxIdle 5   dataSource setInitialSize 5   dataSource setValidationQuery  SELECT 1      Code that needs a DataSource can then use that

User · Answer

I think the example is wrong - javax sql DataSource doesn t have these properties either  Your DataSource needs to be of the type org apache derby jdbc ClientDataSource  which should have those properties

User · Answer

use MYSQL as Example  1  use database connection pools  for Example  Apache Commons DBCP   also  you need basicDataSource jar package in your classpath   Bean public BasicDataSource dataSource         BasicDataSource ds   new BasicDataSource        ds setDriverClassName  com mysql jdbc Driver        ds setUrl  jdbc mysql   localhost 3306 gene        ds setUsername  root        ds setPassword  root        return ds      2 use JDBC-based Driver it is usually used if you don t consider connection pool    Bean public DataSource dataSource        DriverManagerDataSource ds   new DriverManagerDataSource        ds setDriverClassName  com mysql jdbc Driver        ds setUrl  jdbc mysql   localhost 3306 gene        ds setUsername  root        ds setPassword  root        return ds

User · Answer

Basically in JDBC most of these properties are not configurable in the API like that  rather they depend on implementation  The way JDBC handles this is by allowing the connection URL to be different per vendor   So what you do is register the driver so that the JDBC system can know what to do with the URL    DriverManager registerDriver  Driver  Class forName  com mysql jdbc Driver   newInstance       Then you form the URL    String url    jdbc mysql    host   failoverhost      port   database   propertyName1   propertyValue1   amp propertyName2   propertyValue2     And finally  use it to get a connection    Connection c   DriverManager getConnection url     In more sophisticated JDBC  you get involved with connection pools and the like  and application servers often have their own way of registering drivers in JNDI and you look up a DataSource from there  and call getConnection on it   In terms of what properties MySQL supports  see here   EDIT  One more thought  technically just having a line of code which does Class forName  com mysql jdbc Driver   should be enough  as the class should have its own static initializer which registers a version  but sometimes a JDBC driver doesn t  so if you aren t sure  there is little harm in registering a second one  it just creates a duplicate object in memeory

User · Answer

DataSource is vendor-specific  for MySql you could use MysqlDataSource which is provided in the MySql Java connector jar       MysqlDataSource dataSource   new MysqlDataSource        dataSource setDatabaseName  xyz        dataSource setUser  xyz        dataSource setPassword  xyz        dataSource setServerName  xyz yourdomain com

[java] How do I manually configure a DataSource in Java?

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