| Le | Database.Persist.Types, Database.Persist, Database.Persist.Sql | 
| lensPTH | Database.Persist.TH | 
| liftPersist | Database.Persist.Class.PersistStore, Database.Persist.Class, Database.Persist, Database.Persist.Sql | 
| liftSqlPersistMPool | Database.Persist.Sql | 
| limitOffsetOrder | Database.Persist, Database.Persist.Sql | 
| LimitTo | Database.Persist.Class.PersistEntity, Database.Persist.Types, Database.Persist, Database.Persist.Sql | 
| Line |  | 
| 1 (Type/Class) | Database.Persist.Quasi.Internal | 
| 2 (Data Constructor) | Database.Persist.Quasi.Internal | 
| lineIndent | Database.Persist.Quasi.Internal | 
| LinesWithComments |  | 
| 1 (Type/Class) | Database.Persist.Quasi.Internal | 
| 2 (Data Constructor) | Database.Persist.Quasi.Internal | 
| listToJSON | Database.Persist, Database.Persist.Sql | 
| LiteralType | Database.Persist.PersistValue, Database.Persist.Types, Database.Persist, Database.Persist.Sql | 
| loadConfig | Database.Persist.Class.PersistConfig, Database.Persist.Class, Database.Persist, Database.Persist.Sql | 
| LogFunc | Database.Persist.SqlBackend.Internal.MkSqlBackend, Database.Persist.Sql.Types.Internal, Database.Persist.Sql | 
| lowerCaseSettings | Database.Persist.Quasi.Internal, Database.Persist.Quasi | 
| Lt | Database.Persist.Types, Database.Persist, Database.Persist.Sql | 
| lwcComments | Database.Persist.Quasi.Internal | 
| lwcLines | Database.Persist.Quasi.Internal |