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134 lines
5.3 KiB
Text
134 lines
5.3 KiB
Text
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-----------------------------------------------------------------
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To open a connection to the handlersocket plugin, you need to
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create a Net::HandlerSocket object.
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use Net::HandlerSocket;
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my $args = { host => 'localhost', port => 9998 };
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my $hs = new Net::HandlerSocket($args);
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-----------------------------------------------------------------
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Before executing table operations, you need to open an index to
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work with.
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my $err = $hs->open_index(3, 'database1', 'table1', 'PRIMARY',
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'f1,f2');
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die $hs->get_error() if $res->[0] != 0;
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The first argument for open_index is an integer value which is
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used to identify an open table, which is only valid within the
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same Net::HandlerSocket object. The 4th argument is the name of
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index to open. If 'PRIMARY' is specified, the primary index is
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open. The 5th argument is a comma-separated list of column names.
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-----------------------------------------------------------------
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To read a record from a table using an index, call the
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execute_single method.
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my $res = $hs->execute_single(3, '=', [ 'foo' ], 1, 0);
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die $hs->get_error() if $res->[0] != 0;
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shift(@$res);
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The first argument must be an integer which has specified as the
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first argument for open_index on the same Net::HandlerSocket
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object. The second argument specifies the search operation. The
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current version of handlersocket supports '=', '>=', '<=', '>',
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and '<'. The 3rd argument specifies the key to find, which must
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an arrayref whose length is equal to or smaller than the number
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of key columns of the index. The 4th and the 5th arguments
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specify the maximum number of records to be retrieved, and the
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number of records skipped before retrieving records. The columns
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to be retrieved are specified by the 5th argument for the
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corresponding open_index call.
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The execute_single method always returns an arrayref. The first
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element is the error code, which is 0 when no error is occurred.
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The remaining are the field values. If more than one record is
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returned, it is flatten to an 1-dimensional array. For example,
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when 5 records that have 3 columns are returned, you can retrieve
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values using the following code.
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die $hs->get_error() if $res->[0] != 0;
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shift(@$res);
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for (my $row = 0; $row < 5; ++$row) {
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for (my $col = 0; $col < 3; ++$col) {
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my $value = $res->[$row * 5 + $col];
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# ...
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}
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}
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-----------------------------------------------------------------
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To update or delete records, you need to specify more arguments
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for the execute_single method. Note that the Net::HandlerSocket
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object must be connected to a handlersocket worker for write
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operations, which is port 9999 by default.
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(For safety, the port 9998 only allows read operations, and the
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port 9999 allows write operations also. The port 9999 allows
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read operations too, but slower than 9998 because of record
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locking etc.. Port numbers can be changed using the
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'handlersocket_port' and the 'handlersocket_port_wr'
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configuration options of mysqld.)
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my $args = { host => 'localhost', port => 9999 };
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my $hs = new Net::HandlerSocket($args);
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my $res = $hs->execute_single(3, '=', [ 'bar' ], 1, 0, 'U',
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[ 'fubar', 'hoge' ]);
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die $hs->get_error() if $res->[0] != 0;
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my $num_updated_rows = $res->[1];
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my $res = $hs->execute_single(3, '=', [ 'baz' ], 1, 0, 'D');
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die $hs->get_error() if $res->[0] != 0;
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my $num_deleted_rows = $res->[1];
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The 6th argument for execute_single specifies the modification
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operation. The current version supports 'U' and 'D'. For the 'U'
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operation, the 7th argument specifies the new value for the row.
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The columns to be modified are specified by the 5th argument for
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the corresponding open_index call. For the 'D' operation, the
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7th argument can be omitted.
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-----------------------------------------------------------------
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The execute_single method can be used for inserting records also.
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my $res = $hs->execute_single(3, '+', [ 'foo', 'bar', 'baz' ]);
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die $hs->get_error() if $res->[0] != 0;
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The 3rd argument must be an arrayref whose elements correspond to
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the 5th argument for the corresponding open_index call. If there
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is a column which is not appeared in the 5th argument for the
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open_index, the default value for the column is set.
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-----------------------------------------------------------------
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Multiple operations can be executed in a single call. Executing
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multiple operations in a single call is much faster than
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executing them separatedly.
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my $rarr = $hs->execute_multi([
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[ 0, '>=', [ 'foo' ], 5, 0 ],
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[ 2, '=', [ 'bar' ], 1, 0 ],
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[ 4, '<', [ 'baz' ], 10, 5 ],
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]);
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for my $res (@$rarr) {
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die $hs->get_error() if $res->[0] != 0;
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shift(@$res);
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# ...
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}
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-----------------------------------------------------------------
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If handlersocket is configured to authenticate client connections
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(ie., handlersocket_plain_secret or handlersocket_plain_secret_wr
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is set), a client must call 'auth' method before any other
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methods.
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my $res = $hs->auth('password');
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die $hs->get_error() if $res->[0] != 0;
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-----------------------------------------------------------------
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When an error is occurred, the first element of the returned
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arrayref becomes a non-zero value. A negative value indicates
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that an I/O error is occurred and the Net::HandlerSocket object
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should be disposed. A positive value means that the connection is
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still active and the Net::HandlerSocket object can be reused
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later.
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