Creates a connection to a database. As parameter accepts:

• dbspec map containing connection parameters
• dbspec map containing a datasource (deprecated)
• URI or string (interpreted as uri)
• DataSource instance

The dbspec map has this possible variants:

Classic approach:

• :subprotocol -> (required) string that represents a vendor name (ex: postgresql)
• :subname -> (required) string that represents a database name (ex: test) (many others options that are pased directly as driver parameters)

Pretty format:

• :vendor -> (required) string that represents a vendor name (ex: postgresql)
• :name -> (required) string that represents a database name (ex: test)
• :host -> (optional) string that represents a database hostname (default: 127.0.0.1)
• :port -> (optional) long number that represents a database port (default: driver default) (many others options that are pased directly as driver parameters)

URI or String format: vendor://user:password@host:post/dbname?param1=value

Additional options:

• :schema -> string that represents a schema name (default: nil)
• :read-only -> boolean for mark entire connection read only.
• :isolation-level -> keyword that represents a isolation level (:none, :read-committed, :read-uncommitted, :repeatable-read, :serializable)

Opions can be passed as part of dbspec map, or as optional second argument. For more details, see documentation.

Transform a cursor in a lazyseq.

The returned lazyseq will return values until a cursor is closed or all values are fetched.

Execute a query and return a number of rows affected.

(with-open [conn (jdbc/connection dbspec)]
  (jdbc/execute conn "create table foo (id integer);"))

This function also accepts sqlvec format.

Fetch eagerly results executing a query.

This function returns a vector of records (default) or rows (depending on specified opts). Resources are relased inmediatelly without specific explicit action for it.

It accepts a sqlvec, plain sql or prepared statement as query parameter.

Fetch lazily results executing a query.

(with-open [cursor (jdbc/fetch-lazy conn sql)]
  (doseq [item (jdbc/cursor->lazyseq cursor)]
    (do-something-with item)))

This function returns a cursor instead of result. You should explicitly close the cursor at the end of iteration for release resources.

Fetch eagerly one restult executing a query.

Given a string or parametrized sql in sqlvec format return an instance of prepared statement.

Check if specified object is prepared statement.