Struct mysql::Conn
[−]
[src]
pub struct Conn { /* fields omitted */ }
Mysql connection.
Methods
impl Conn
[src]
fn new<T: Into<Opts>>(opts: T) -> MyResult<Conn>
Creates new Conn
.
fn reset(&mut self) -> MyResult<()>
Resets MyConn
(drops state then reconnects).
fn ping(&mut self) -> bool
Executes COM_PING
on Conn
. Return true
on success or false
on error.
fn start_transaction<'a>(
&'a mut self,
consistent_snapshot: bool,
isolation_level: Option<IsolationLevel>,
readonly: Option<bool>
) -> MyResult<Transaction<'a>>
&'a mut self,
consistent_snapshot: bool,
isolation_level: Option<IsolationLevel>,
readonly: Option<bool>
) -> MyResult<Transaction<'a>>
Starts new transaction with provided options.
readonly
is only available since MySQL 5.6.5.
fn query<T: AsRef<str>>(&mut self, query: T) -> MyResult<QueryResult>
Implements text protocol of mysql server.
Executes mysql query on Conn
. QueryResult
will borrow Conn
until the end of its scope.
fn first<T: AsRef<str>>(&mut self, query: T) -> MyResult<Option<Row>>
Performs query and returns first row.
fn prepare<T: AsRef<str>>(&mut self, query: T) -> MyResult<Stmt>
Implements binary protocol of mysql server.
Prepares mysql statement on Conn
. Stmt
will
borrow Conn
until the end of its scope.
This call will take statement from cache if has been prepared on this connection.
JSON caveats
For the following statement you will get somewhat unexpected result {"a": 0}
, because
booleans in mysql binary protocol is TINYINT(1)
and will be interpreted as 0
:
pool.prep_exec(r#"SELECT JSON_REPLACE('{"a": true}', '$.a', ?)"#, (false,));
You should wrap such parameters to a proper json value. For example if you are using rustc_serialize for Json support:
pool.prep_exec(r#"SELECT JSON_REPLACE('{"a": true}', '$.a', ?)"#, (Json::Boolean(false),));
Named parameters support
prepare
supports named parameters in form of :named_param_name
. Allowed characters for
parameter name is [a-z_]
. Named parameters will be converted to positional before actual
call to prepare so SELECT :a-:b, :a*:b
is actually SELECT ?-?, ?*?
.
// Names could be repeated pool.prep_exec("SELECT :a+:b, :a * :b, ':c'", params!{"a" => 2, "b" => 3}).map(|mut result| { let row = result.next().unwrap().unwrap(); assert_eq!((5, 6, String::from(":c")), from_row(row)); }).unwrap(); // You can call named statement with positional parameters pool.prep_exec("SELECT :a+:b, :a*:b", (2, 3, 2, 3)).map(|mut result| { let row = result.next().unwrap().unwrap(); assert_eq!((5, 6), from_row(row)); }).unwrap(); // You must pass all named parameters for statement let err = pool.prep_exec("SELECT :name", params!{"another_name" => 42}).unwrap_err(); match err { DriverError(e) => { assert_eq!(MissingNamedParameter("name".into()), e); } _ => unreachable!(), } // You can't call positional statement with named parameters let err = pool.prep_exec("SELECT ?", params!{"first" => 42}).unwrap_err(); match err { DriverError(e) => assert_eq!(NamedParamsForPositionalQuery, e), _ => unreachable!(), } // You can't mix named and positional parameters let err = pool.prepare("SELECT :a, ?").unwrap_err(); match err { DriverError(e) => assert_eq!(MixedParams, e), _ => unreachable!(), }
fn prep_exec<A, T>(&mut self, query: A, params: T) -> MyResult<QueryResult> where
A: AsRef<str>,
T: Into<Params>,
A: AsRef<str>,
T: Into<Params>,
Prepares and executes statement in one call. See 'Conn::prepare'
This call will take statement from cache if has been prepared on this connection.
fn first_exec<Q, P>(&mut self, query: Q, params: P) -> MyResult<Option<Row>> where
Q: AsRef<str>,
P: Into<Params>,
Q: AsRef<str>,
P: Into<Params>,
Executes statement and returns first row.
fn set_local_infile_handler(&mut self, handler: Option<LocalInfileHandler>)
Sets a callback to handle requests for local files. These are
caused by using LOAD DATA LOCAL INFILE
queries. The
callback is passed the filename, and a Write
able object
to receive the contents of that file.
Specifying None
will reset the handler to the one specified
in the Opts
for this connection.
fn no_backslash_escape(&self) -> bool
Trait Implementations
impl Debug for Conn
[src]
impl GenericConnection for Conn
[src]
fn query<T: AsRef<str>>(&mut self, query: T) -> MyResult<QueryResult>
See Conn#query
. Read more
fn first<T: AsRef<str>>(&mut self, query: T) -> MyResult<Option<Row>>
See Conn#first
. Read more
fn prepare<T: AsRef<str>>(&mut self, query: T) -> MyResult<Stmt>
See Conn#prepare
. Read more
fn prep_exec<A, T>(&mut self, query: A, params: T) -> MyResult<QueryResult> where
A: AsRef<str>,
T: Into<Params>,
A: AsRef<str>,
T: Into<Params>,
See Conn#prep_exec
. Read more
fn first_exec<Q, P>(&mut self, query: Q, params: P) -> MyResult<Option<Row>> where
Q: AsRef<str>,
P: Into<Params>,
Q: AsRef<str>,
P: Into<Params>,
See Conn#first_exec
. Read more