DB Lookup Mediator
The dblookup mediator is capable of executing an arbitrary SQL select
statement, and then set some resulting values as local message
properties on the message context. The DB connection used maybe looked
up from an external DataSource or specified in-line, in which case an
Apache DBCP connection pool is established and used.
DBLookup mediator options
Figure 1: DBLookup mediator options
DBLookup mediator options field descriptions,
- Connection Information - Specify whether the connection is
taken from a connection pool or from a data source
- Driver - Database driver
- Url - JDBC URL of the database that data will be looked up.
- User - Username that's used to connect to the database.
- Password - Password used to connect to the database.
Data sources
Carbon Datasources
If existing data source is choosen, clicking "Load Data Sources" will give the available datasource. Then a data source can be selected.
Figure 2: Carbon Datasources
External Datasources
Like in Pool connection data source configuration properties should be specified.
Figure 3: External Datasources
Adding properties
Properties can be added by 'Add Property' link.
Figure 4: Adding a property
Property field descriptions,
- autocommit = true | false
- isolation = Connection.TRANSACTION_NONE |
Connection.TRANSACTION_READ_COMMITTED |
Connection.TRANSACTION_READ_UNCOMMITTED |
Connection.TRANSACTION_REPEATABLE_READ |
Connection.TRANSACTION_SERIALIZABLE
- initialsize = int
- maxactive = int
- maxidle = int
- maxopenstatements = int
- maxwait = long
- minidle = int
- poolstatements = true | false
- testonborrow = true | false
- testwhileidle = true | false
- validationquery = String
Adding SQL statements
- SQL Statements can by added by clicking the 'Add Statement' link.
- More than one statement may be specified.
- The SQL statement may
specify parameters which could be specified as values or XPath
expressions.
- The types of parameters could be any valid SQL types.
Only
the first row of a result set will be considered and any others are
ignored.
Figure 5: Add Statements