Execution Context and Interpolation Strings¶

As already mentioned in previous sections, the purpose of wrappers is executing queries and/or updates on data sources.

When Virtual DataPort requests a wrapper to execute a query, it uses two different ways to provide the data on the query conditions that the wrapper should execute on the source:

• As a structured list of query conditions. This is the manner used by most wrapper types.

• As a series of interpolation variables included in a run context. This form of access is used by JDBC wrappers that use a pattern SQL query. The section Execution Context of a Query and Interpolation Strings contains more details about interpolation strings.