In a report, there are three groups of objects that can store values:
| • | Fields |
| • | Parameters |
| • | Variables |
Jaspersoft Studio uses these objects in data source queries. In order to use these objects in a report, they must be declared with a discrete type that corresponds to a Java class, such as String or Double. After they have been declared in a report design, the objects can be modified or updated during the report generation process.
This chapter contains the following sections:
| • | Understanding Fields |
| • | Registration of Fields from a SQL Query |
| • | Registration of JavaBean Fields |
| • | Fields and Textfields |
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