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use odbc_sys::*;
use util::VecCapacityExt;
use {std, util, SqlDiagnosticRecord, SqlError, SqlResult};
pub trait SqlHandle: Drop + Send + Sync + Sized + 'static {
const TYPE: HandleType;
type Type: Copy + Sized + 'static;
unsafe fn typed_handle(&self) -> Self::Type;
unsafe fn handle(&self) -> SQLHANDLE;
fn diagnostics_count(&self) -> SqlResult<usize> {
let mut count: SQLINTEGER = 0;
let ret = unsafe {
SQLGetDiagFieldW(
Self::TYPE,
self.handle(),
0, SqlHeaderDiagnosticIdentifier::SQL_DIAG_NUMBER as SQLSMALLINT,
(&mut count as *mut SQLINTEGER) as SQLPOINTER,
0, std::ptr::null_mut(),
)
};
match ret {
SQL_SUCCESS => {
assert!(count >= 0);
Ok(count as usize)
}
SQL_NO_DATA => {
assert_eq!(0, count);
Ok(0)
}
SQL_ERROR => Err(ret.into()),
_ => panic!("Unexpected SQLGetDiagFieldW return code: {:?}", ret),
}
}
fn has_diagnostics(&self) -> SqlResult<bool> {
let count = self.diagnostics_count()?;
Ok(count > 0)
}
fn diagnostics(&self) -> SqlResult<Vec<SqlDiagnosticRecord>> {
let count = self.diagnostics_count()?;
let mut results: Vec<SqlDiagnosticRecord> = Vec::with_capacity(count);
let mut state: [SQLWCHAR; SQL_SQLSTATE_SIZE + 1] = [0 as SQLWCHAR; SQL_SQLSTATE_SIZE + 1];
let mut native_error: SQLINTEGER = 0;
let mut message_buffer: Vec<SQLWCHAR> = Vec::with_capacity(SQL_MAX_MESSAGE_LENGTH as usize);
let mut text_len: SQLSMALLINT = 0;
for i in 1..=count {
loop {
let ret = unsafe {
SQLGetDiagRecW(
Self::TYPE,
self.handle(),
i as SQLSMALLINT,
state.as_mut_ptr(),
&mut native_error,
message_buffer.as_mut_ptr(),
message_buffer.capacity() as SQLSMALLINT,
&mut text_len,
)
};
match ret {
SQL_ERROR => return Err(ret.into()),
SQL_SUCCESS => {
assert!(text_len >= 0);
let text_len = text_len as usize;
unsafe {
message_buffer.set_len_checked(text_len);
}
let state_string = util::from_utf_16_null_terminated(&state)?;
let message_text = util::from_utf_16_null_terminated(&message_buffer)?;
let record = SqlDiagnosticRecord {
state: state_string,
message: message_text,
native_error,
};
results.push(record);
break;
}
SQL_SUCCESS_WITH_INFO => {
assert!(text_len >= 0);
message_buffer.reserve_capacity(text_len as usize + 1);
}
SQL_NO_DATA => return Ok(results),
_ => panic!("Unexpected SQLGetDiagRecW return code: {:?}", ret),
};
}
}
Ok(results)
}
fn get_detailed_error(&self, return_code: SQLRETURN) -> SqlError {
assert_ne!(return_code, SQL_SUCCESS);
assert_ne!(return_code, SQL_SUCCESS_WITH_INFO);
assert_ne!(return_code, SQL_STILL_EXECUTING);
if let Ok(details) = self.diagnostics() {
SqlError::OdbcError {
return_code,
details,
}
} else {
return_code.into()
}
}
}
pub(crate) unsafe trait SqlRawHandle: SqlHandle {
unsafe fn alloc_handle() -> SqlResult<SQLHANDLE> {
let parent_handle: SQLHANDLE = std::ptr::null_mut();
let mut handle: SQLHANDLE = std::ptr::null_mut();
let ret = SQLAllocHandle(Self::TYPE, parent_handle, &mut handle);
match ret {
SQL_SUCCESS | SQL_SUCCESS_WITH_INFO => Ok(handle),
SQL_ERROR => Err(ret.into()),
_ => panic!("Unexpected SQLAllocHandle return code: {:?}", ret),
}
}
unsafe fn dealloc_handle(&mut self) -> SqlResult {
let ret = SQLFreeHandle(Self::TYPE, self.handle());
match ret {
SQL_SUCCESS | SQL_SUCCESS_WITH_INFO => Ok(()),
SQL_ERROR => {
let e = self.get_detailed_error(ret);
Err(e)
}
_ => panic!("Unexpected SQLFreeHandle return code: {:?}", ret),
}
}
unsafe fn alloc_child_handle<T: SqlRawHandle>(&self) -> SqlResult<SQLHANDLE> {
let mut handle: SQLHANDLE = std::ptr::null_mut();
let ret = SQLAllocHandle(T::TYPE, self.handle(), &mut handle);
match ret {
SQL_SUCCESS | SQL_SUCCESS_WITH_INFO => Ok(handle),
SQL_ERROR => {
let e = self.get_detailed_error(ret);
Err(e)
}
_ => panic!("Unexpected child SQLAllocHandle return code: {:?}", ret),
}
}
}