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maybeRead :: Read a => String -> Maybe apercent-format Text.PercentFormat.Utils Reads a value encoded as a string, return Just the value or Nothing on error.
class (PersistCore backend, PersistStoreRead backend) =>
PersistQueryRead backendpersistent-mtl Database.Persist.Sql.Shim Backends supporting conditional read operations.
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persistent-mtl Database.Persist.Sql.Shim No documentation available.
class PersistStoreRead backend =>
PersistUniqueRead backendpersistent-mtl Database.Persist.Sql.Shim Queries against Unique keys (other than the id Key). Please read the general Persistent documentation to learn how to create Unique keys. Using this with an Entity without a Unique key leads to undefined behavior. A few of these functions require a single Unique, so using an Entity with multiple Uniques is also undefined. In these cases persistent's goal is to throw an exception as soon as possible, but persistent is still transitioning to that. SQL backends automatically create uniqueness constraints, but for MongoDB you must manually place a unique index on a field to have a uniqueness constraint.
RepeatableRead :: IsolationLevelpersistent-mtl Database.Persist.Sql.Shim No documentation available.
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persistent-mtl Database.Persist.Sql.Shim A constraint synonym which witnesses that a backend is SQL and can run read queries.
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persistent-mtl Database.Persist.Sql.Shim An SQL backend which can only handle read queries The constructor was exposed in 2.10.0.
SqlReadBackend :: SqlBackend -> SqlReadBackendpersistent-mtl Database.Persist.Sql.Shim No documentation available.
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persistent-mtl Database.Persist.Sql.Shim Like SqlPersistT but compatible with any SQL backend which can handle read queries.
StatementAlreadyFinalized :: Text -> PersistentSqlExceptionpersistent-mtl Database.Persist.Sql.Shim No documentation available.