6.4.1 Selecting the Type of Data Loader
If your data has a flat tabular structure, the Data Loader should be based on the DataLoader2 interface. This is the simplest and most convenient option, as it deals only with primitive data types and does not require a Data Helper class.
For data which has a hierarchy (especially recursive hierarchy) the Data Loader should be based on the DataLoader interface or on introspection: Examples of hierarchy:
• One forest has N trees, one tree has M leaves.
• An 'Employee' has a 'Manager' who is also an 'Employee', etc.
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