View Source Adbc.Connection (adbc v0.6.2)
Documentation for Adbc.Connection
.
Connection are modelled as processes. They require
an Adbc.Database
to be started.
Summary
Functions
Returns a specification to start this module under a supervisor.
Get a binary (bytes) type option of the connection.
Gets the underlying driver of a connection process.
Get a float type option of the connection.
Get metadata about the database/driver.
Get an integer type option of the connection.
Get a hierarchical view of all catalogs, database schemas, tables, and columns.
Get a string type option of the connection.
Get a list of table types in the database.
Prepares the given query
.
Runs the given query
with params
and statement_options
.
Same as query/4
but raises an exception on error.
Runs the given query
with params
and
pass the ArrowStream pointer to the given function.
Set option for the connection.
Starts a connection process.
Types
@type result_set() :: Adbc.Result.t()
@type t() :: GenServer.server()
Functions
Returns a specification to start this module under a supervisor.
See Supervisor
.
Get a binary (bytes) type option of the connection.
Gets the underlying driver of a connection process.
Examples
ADBC.Connection.get_driver(conn)
#=> {:ok, :sqlite}
Get a float type option of the connection.
@spec get_info(t(), [non_neg_integer()]) :: {:ok, result_set()} | {:error, Exception.t()}
Get metadata about the database/driver.
The result is an Arrow dataset with the following schema:
Field Name | Field Type | Null Contstraint |
---|---|---|
info_name | uint32 | not null |
info_value | INFO_SCHEMA |
INFO_SCHEMA
is a dense union with members:
Field Name | Type Code | Field Type |
---|---|---|
string_value | 0 | utf8 |
bool_value | 1 | bool |
int64_value | 2 | int64 |
int32_bitmask | 3 | int32 |
string_list | 4 | list<utf8> |
int32_to_int32_list_map | 5 | map<int32, list<int32>> |
Each metadatum is identified by an integer code. The recognized codes are defined as constants. Codes [0, 10_000) are reserved for ADBC usage. Drivers/vendors will ignore requests for unrecognized codes (the row will be omitted from the result).
Get an integer type option of the connection.
@spec get_objects( t(), non_neg_integer(), catalog: String.t(), db_schema: String.t(), table_name: String.t(), table_type: [String.t()], column_name: String.t() ) :: {:ok, result_set()} | {:error, Exception.t()}
Get a hierarchical view of all catalogs, database schemas, tables, and columns.
The result is an Arrow dataset with the following schema:
Field Name | Field Type |
---|---|
catalog_name | utf8 |
catalog_db_schemas | list<DB_SCHEMA_SCHEMA> |
DB_SCHEMA_SCHEMA
is a Struct with fields:
Field Name | Field Type |
---|---|
db_schema_name | utf8 |
db_schema_tables | list<TABLE_SCHEMA> |
TABLE_SCHEMA
is a Struct with fields:
Field Name | Field Type | Null Contstraint |
---|---|---|
table_name | utf8 | not null |
table_type | utf8 | not null |
table_columns | list<COLUMN_SCHEMA> | |
table_constraints | list<CONSTRAINT_SCHEMA> |
COLUMN_SCHEMA
is a Struct with fields:
Field Name | Field Type | Null Contstraint | Comments |
---|---|---|---|
column_name | utf8 | not null | |
ordinal_position | int32 | (1) | |
remarks | utf8 | (2) | |
xdbc_data_type | int16 | (3) | |
xdbc_type_name | utf8 | (3) | |
xdbc_column_size | int32 | (3) | |
xdbc_decimal_digits | int16 | (3) | |
xdbc_num_prec_radix | int16 | (3) | |
xdbc_nullable | int16 | (3) | |
xdbc_column_def | utf8 | (3) | |
xdbc_sql_data_type | int16 | (3) | |
xdbc_datetime_sub | int16 | (3) | |
xdbc_char_octet_length | int32 | (3) | |
xdbc_is_nullable | utf8 | (3) | |
xdbc_scope_catalog | utf8 | (3) | |
xdbc_scope_schema | utf8 | (3) | |
xdbc_scope_table | utf8 | (3) | |
xdbc_is_autoincrement | bool | (3) | |
xdbc_is_generatedcolumn | bool | (3) |
- The column's ordinal position in the table (starting from 1).
- Database-specific description of the column.
- Optional value. Should be null if not supported by the driver.
xdbc_
values are meant to provide JDBC/ODBC-compatible metadata in an agnostic manner.
CONSTRAINT_SCHEMA
is a Struct with fields:
Field Name | Field Type | Null Contstraint | Comments |
---|---|---|---|
constraint_name | utf8 | ||
constraint_type | utf8 | not null | (1) |
constraint_column_names | list<utf8> | not null | (2) |
constraint_column_usage | list<USAGE_SCHEMA> | (3) |
- One of 'CHECK', 'FOREIGN KEY', 'PRIMARY KEY', or 'UNIQUE'.
- The columns on the current table that are constrained, in order.
- For FOREIGN KEY only, the referenced table and columns.
USAGE_SCHEMA
is a Struct with fields:
Field Name | Field Type | Null Contstraint |
---|---|---|
fk_catalog | utf8 | |
fk_db_schema | utf8 | |
fk_table | utf8 | not null |
fk_column_name | utf8 | not null |
Get a string type option of the connection.
@spec get_table_types(t()) :: {:ok, result_set()} | {:error, Exception.t()}
Get a list of table types in the database.
The result is an Arrow dataset with the following schema:
Field Name | Field Type | Null Contstraint |
---|---|---|
table_type | utf8 | not null |
@spec prepare(t(), binary()) :: {:ok, reference()} | {:error, Exception.t()}
Prepares the given query
.
@spec query(t(), binary() | reference(), [term()], Keyword.t()) :: {:ok, result_set()} | {:error, Exception.t()}
Runs the given query
with params
and statement_options
.
Same as query/4
but raises an exception on error.
query_pointer(conn, query, params \\ [], fun, statement_options \\ [])
View SourceRuns the given query
with params
and
pass the ArrowStream pointer to the given function.
The pointer will point to a valid ArrowStream through the duration of the function. The function may call native code that consumes the ArrowStream accordingly.
@spec set_option( pid(), atom() | String.t(), atom() | {:binary, iodata()} | String.t() | number() ) :: :ok | {:error, String.t()}
Set option for the connection.
- If
value
is an atom or a string, then corresponding string option will be set. - If
value
is a{:binary, iodata()}
-tuple, then corresponding binary option will be set. - If
value
is an integer, then corresponding integer option will be set. - If
value
is a float, then corresponding float option will be set.
Starts a connection process.
Options
:database
(required) - the database process to connect to:process_options
- the options to be given to the underlying process. SeeGenServer.start_link/3
for all options
Examples
Adbc.Connection.start_link(
database: MyApp.DB,
process_options: [name: MyApp.Conn]
)
In your supervision tree it would be started like this:
children = [
{Adbc.Connection,
database: MyApp.DB,
process_options: [name: MyApp.Conn]}
]