ResultRange

This is returned by the mysql.commands.query functions.

The rows are downloaded one-at-a-time, as you iterate the range. This allows for low memory usage, and quick access to the results as they are downloaded. This is especially ideal in case your query results in a large number of rows.

However, because of that, this ResultRange cannot offer random access or a length member. If you need random access, then just like any other range, you can simply convert this range to an array via std.array.array().

A ResultRange becomes invalidated (and thus cannot be used) when the server is sent another command on the same connection. When an invalidated ResultRange is used, a mysql.exceptions.MYXInvalidatedRange is thrown. If you need to send the server another command, but still access these results afterwords, you can save the results for later by converting this range to an array via std.array.array().

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struct ResultRange {

bool isValid [@property getter];

bool empty [@property getter];

inout(Row) front [@property getter];

void popFront();

Variant[string] asAA();

const(string)[] colNames [@property getter];

const(size_t[string]) colNameIndicies [@property getter];

void close();

ulong rowCount [@property getter];

}

Constructors

this this(Connection con, ResultSetHeaders rsh, string[] colNames): Undocumented in source.

Members

Functions

asAA Variant[string] asAA(): Get the current row as an associative array by column name
close void close(): Explicitly clean up the MySQL resources and cancel pending results
popFront void popFront(): Progresses to the next row of the result set - that will then be 'front'

Properties

colNameIndicies const(size_t[string]) colNameIndicies [@property getter]: An AA to lookup a column's index by name
colNames const(string)[] colNames [@property getter]: Get the names of all the columns
empty bool empty [@property getter]: Check whether there are any rows left
front inout(Row) front [@property getter]: Gets the current row
isValid bool isValid [@property getter]: Check whether the range can still be used, or has been invalidated.
rowCount ulong rowCount [@property getter]: Get the number of rows retrieved so far.

ResultRange oneAtATime = myConnection.query("SELECT * from myTable");
Row[]       allAtOnce  = myConnection.query("SELECT * from myTable").array;

ResultRange

Constructors

Members

Functions

Properties

Detailed Description

Type Mappings

Examples

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Source