| This is a simple template file loader that loads templates
from a DataSource instead of plain files.
It can be configured with a datasource name, a table name,
id column (name), content column (the template body) and a
datetime column (for last modification info).
Example configuration snippet for velocity.properties:
resource.loader = file, ds
ds.resource.loader.public.name = DataSource
ds.resource.loader.description = Velocity DataSource Resource Loader
ds.resource.loader.class = org.apache.velocity.runtime.resource.loader.DataSourceResourceLoader
ds.resource.loader.resource.datasource = java:comp/env/jdbc/Velocity
ds.resource.loader.resource.table = tb_velocity_template
ds.resource.loader.resource.keycolumn = id_template
ds.resource.loader.resource.templatecolumn = template_definition
ds.resource.loader.resource.timestampcolumn = template_timestamp
ds.resource.loader.cache = false
ds.resource.loader.modificationCheckInterval = 60
Optionally, the developer can instantiate the DataSourceResourceLoader and set the DataSource via code in
a manner similar to the following:
DataSourceResourceLoader ds = new DataSourceResourceLoader();
ds.setDataSource(DATASOURCE);
Velocity.setProperty("ds.resource.loader.instance",ds);
The property ds.resource.loader.class should be left out, otherwise all the other
properties in velocity.properties would remain the same.
Example WEB-INF/web.xml:
Velocity template DataSource
jdbc/Velocity
javax.sql.DataSource
Container
and Tomcat 4 server.xml file:
[...]
[...]
driverClassName
org.hsql.jdbcDriver
driverName
jdbc:HypersonicSQL:database
user
database_username
password
database_password
[...]
[...]
Example sql script:
CREATE TABLE tb_velocity_template (
id_template varchar (40) NOT NULL ,
template_definition text (16) NOT NULL ,
template_timestamp datetime NOT NULL
)
author:
Will Glass-Husain
author:
Matt Raible
author:
David Kinnvall
author:
Paulo Gaspar
author:
Sylwester Lachiewicz
author:
Henning P. Schmiedehausen
version:
$Id: DataSourceResourceLoader.java 471259 2006-11-04 20:26:57Z henning $ | 