toucan2.jdbc.read — io.github.camsaul/toucan2 1.0.528

read-column-thunk method, which is used to determine how to read values of columns in results, and default implementations

get-object-of-class-thunk clj

(get-object-of-class-thunk rset i klass)

Return a thunk that will be used to fetch values at column index i from ResultSet rset as a given class. Calling this thunk is equivalent to

(.getObject rset i klass)

but includes extra logging.

read-column-thunk clj

(read-column-thunk conn₁ model₂ rset rsmeta₍₃₎ i)

Return a zero-arg function that, when called, will fetch the value of the column from the current row.

Dispatches on java.sql.Connection class, model, and the java.sql.Types mapping for the column, e.g. java.sql.Types/TIMESTAMP.

TODO -- dispatch for this method is busted.

1. The java.sql.Types column type should be an explicit parameter. A little weird to dispatch off of something that's not even one of the parameters

2. Should this also dispatch off of the actual underlying column name? So you can read a column in different ways for different models.

3. Should this dispatch off of the underlying database column type name string, e.g. timestamp or timestamptz? It seems like a lot of the time we need to do different things based on that type name.

read-column-thunk is defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:27).

It caches methods using a methodical.impl.cache.watching.WatchingCache.

It uses the method combination methodical.impl.combo.threaded.ThreadingMethodCombination with the threading strategy :thread-last.

It uses the dispatcher methodical.impl.dispatcher.multi_default.MultiDefaultDispatcher with hierarchy #'clojure.core/global-hierarchy and prefs {[:toucan2.jdbc.mysql-mariadb/connection :default 93] #{[java.sql.Connection :default 93]}, [:toucan2.jdbc.postgres/connection :default 93] #{[java.sql.Connection :default 93]}}.

The default value is :default.

It uses the method table methodical.impl.method_table.standard.StandardMethodTable.

These primary methods are known:

• :default, defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:58)

• [:default :default 92], defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:113)

• [:default :default 2005], defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:96)

• [:toucan2.jdbc.mysql-mariadb/connection :default 93], defined in [[toucan2.jdbc.mysql-mariadb]] (toucan2/jdbc/mysql_mariadb.clj:27)

  It has the following documentation:

  MySQL/MariaDB timestamp is normalized to UTC, so return it as an OffsetDateTime rather than a LocalDateTime. datetime columns should be returned as LocalDateTime. Both timestamp and datetime seem to come back as java.sql.Types/TIMESTAMP, so check the actual database column type name so we can fetch objects as the correct class.

• [:toucan2.jdbc.postgres/connection :default 93], defined in [[toucan2.jdbc.postgres]] (toucan2/jdbc/postgres.clj:18)

  It has the following documentation:

  Both Postgres timestamp and timestamp with time zone come back as java.sql.Types/TIMESTAMP; check the actual database column type name so we can fetch objects as the correct class.

• [:default :default 2014], defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:105)

• [:default :default 93], defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:101)

• [:default :default 91], defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:109)

• [:default :default 2013], defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:117)

These aux methods are known:

:after methods:

• :default, defined in toucan2.jdbc.read (toucan2/jdbc/read.clj:65)

type-name clj

(type-name i)

(type-name i not-found)

Map of java.sql.Types enum integers (e.g. java.sql.Types/FLOAT, whose value is 6) to the string type name e.g. FLOAT.

(type-name java.sql.Types/FLOAT) -> (type-name 6) -> "FLOAT"