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CWE-ou-minkata/MOULOpenSourceClientPlugin/Plasma20/Sources/Plasma/NucleusLib/pnSqlLib/Private/pnSqlConn.cpp

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/*==LICENSE==*
CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011 Cyan Worlds, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
Additional permissions under GNU GPL version 3 section 7
If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
NVIDIA PhysX SDK, Microsoft DirectX SDK, OpenSSL library, Independent
JPEG Group JPEG library, Microsoft Windows Media SDK, or Apple QuickTime SDK
(or a modified version of those libraries),
containing parts covered by the terms of the Bink SDK EULA, 3ds Max EULA,
PhysX SDK EULA, DirectX SDK EULA, OpenSSL and SSLeay licenses, IJG
JPEG Library README, Windows Media SDK EULA, or QuickTime SDK EULA, the
licensors of this Program grant you additional
permission to convey the resulting work. Corresponding Source for a
non-source form of such a combination shall include the source code for
the parts of OpenSSL and IJG JPEG Library used as well as that of the covered
work.
You can contact Cyan Worlds, Inc. by email legal@cyan.com
or by snail mail at:
Cyan Worlds, Inc.
14617 N Newport Hwy
Mead, WA 99021
*==LICENSE==*/
/*****************************************************************************
*
* $/Plasma20/Sources/Plasma/NucleusLib/pnSqlLib/Private/pnSqlConn.cpp
*
***/
#include "../Pch.h"
#pragma hdrstop
//#define LOG_SQL_STMTS
//#define ODBC_TRACING
#define ORACLE_FREE_DRIVER
/*****************************************************************************
*
* Private
*
***/
static unsigned kConnectionTaskCount = 10;
static unsigned kCheckDeadTaskCount = 5;
static unsigned kLoginTimeoutSecs = 30;
static unsigned kConnectionTimeoutSecs = 60;
struct SqlState {
SQLCHAR buffer[6];
};
struct SqlStmtHash {
FSqlBindPrepare prepare;
SqlStmtHash ();
SqlStmtHash (FSqlBindPrepare prepare);
dword GetHash () const;
bool operator== (const SqlStmtHash & rhs) const;
};
static const unsigned kStmtFlagBindColMode = 1<<0;
static const unsigned kStmtFlagBindParamMode = 1<<1;
static const unsigned kStmtFlagDriverConnected = 1<<2;
static const unsigned kStmtFlagDelete = 1<<3;
static const unsigned kStmtFlagReset = 1<<4;
struct SqlStmt : SqlStmtHash {
HASHLINK(SqlStmt) hashLink;
LINK(SqlStmt) listLink;
SqlConn * conn;
SQLHDBC hdbc;
SQLHSTMT hstmt;
unsigned flags;
int bindCol;
int bindParam;
FSqlConnErrorHandler errHandler;
void * errHandlerParam;
unsigned sequence;
unsigned timeoutSecs;
byte * data;
wchar debug[128];
SqlStmt (SqlConn * conn);
~SqlStmt ();
SqlStmt & operator= (const SqlStmt &); // not impl.
bool Initialize (const wchar connectStr[]);
void Reset ();
bool QueryDead (unsigned method);
};
static const unsigned kConnFlagInvalid = 1<<0;
struct SqlConn {
CCritSect critsect;
SQLHENV henv;
unsigned flags;
unsigned desiredConns;
unsigned currentConns;
unsigned connectTasks;
unsigned checkDeadTasks;
unsigned sequence;
unsigned timeoutSecs;
AsyncThreadTaskList * taskList;
wchar * connectStr;
LISTDECL(
SqlStmt,
listLink
) stmts;
HASHTABLEDECL(
SqlStmt,
SqlStmtHash,
hashLink
) freeStmts;
SqlConn (
const wchar connectStr[],
SQLHENV henv
);
~SqlConn ();
bool GrowConnections_CS (unsigned attempts);
void AsyncGrowConnections_CS ();
void CheckDead_CS ();
void AsyncCheckDead_CS ();
};
/*****************************************************************************
*
* Private data
*
***/
static long s_perf[kSqlConnNumPerf];
/*****************************************************************************
*
* Logging
*
***/
//============================================================================
static bool EnumDiagRec (
SQLSMALLINT handleType,
SQLHANDLE handle,
unsigned index,
unsigned code,
SQLSMALLINT destChars,
SQLCHAR dest[],
SQLINTEGER * native,
SqlState * state
) {
SQLSMALLINT msgLen;
int result = SQLGetDiagRec(
handleType,
handle,
(SQLSMALLINT) index,
state->buffer,
native,
dest,
destChars,
&msgLen
);
if (result == SQL_NO_DATA)
return false;
if (!SQL_SUCCEEDED(result)) {
LogMsg(kLogError, "Sql(%u) %d, DiagRec", code, result);
return false;
}
return true;
}
//============================================================================
static void LogErr (
int result,
SQLSMALLINT handleType,
SQLHANDLE handle,
const wchar function[],
const wchar command[]
) {
if (SQL_SUCCEEDED(result) && result != SQL_SUCCESS_WITH_INFO)
return;
if (result == SQL_NEED_DATA)
return;
if (result == SQL_NO_DATA)
return;
static long s_code = 1;
long code = AtomicAdd(&s_code, 1);
ELogSeverity severity = result == SQL_SUCCESS_WITH_INFO ? kLogPerf : kLogError;
LogMsg(severity, "Sql(%u) %d, %S, %S", code, result, function, command);
for (int index = 1;; ++index) {
// Get next message
SqlState state;
SQLINTEGER native;
SQLCHAR msgStr[512];
const bool indexValid = EnumDiagRec(
handleType,
handle,
index,
code,
arrsize(msgStr),
msgStr,
&native,
&state
);
if (!indexValid)
break;
LogMsg(severity, " Sql(%u) %d, %s, %s", code, native, state.buffer, msgStr);
}
}
//============================================================================
static void LogStmtError (
int result,
SqlStmt * stmt,
const wchar function[]
) {
if (result == SQL_SUCCESS)
return;
if (result == SQL_NEED_DATA)
return;
if (result == SQL_NO_DATA)
return;
// Once a statement has an error, it is possible for it to get "wedged";
// so reset the statement after this transaction to make it happy.
stmt->flags |= kStmtFlagReset;
// Get any diagnostics from SQL
ARRAY(char) diagRecs;
for (int index = 1;; ++index) {
// Get next message
SqlState state;
SQLINTEGER native;
SQLCHAR msgStr[512];
const bool indexValid = EnumDiagRec(
SQL_HANDLE_STMT,
stmt->hstmt,
index,
0,
arrsize(msgStr),
msgStr,
&native,
&state
);
if (!indexValid)
break;
diagRecs.Add((const char *)msgStr, StrLen((const char *) msgStr) + 1);
}
diagRecs.Add(L'\0');
// If the statement doesn't have a handler, handle it the default way
if (!stmt->errHandler) {
LogErr(result, SQL_HANDLE_STMT, stmt->hstmt, function, stmt->debug);
return;
}
// Send the error to the statement's handler
stmt->errHandler(
result,
function,
stmt->debug,
diagRecs.Ptr(),
stmt->errHandlerParam
);
}
/*****************************************************************************
*
* SqlStmtHash
*
***/
//============================================================================
inline SqlStmtHash::SqlStmtHash ()
: prepare(nil)
{}
//============================================================================
inline SqlStmtHash::SqlStmtHash (FSqlBindPrepare prepare)
: prepare(prepare)
{}
//============================================================================
inline dword SqlStmtHash::GetHash () const {
return (dword) prepare;
}
//============================================================================
inline bool SqlStmtHash::operator== (const SqlStmtHash & rhs) const {
return prepare == rhs.prepare;
}
/*****************************************************************************
*
* SqlStmt
*
***/
//============================================================================
SqlStmt::SqlStmt (SqlConn * conn)
: conn(conn)
, hdbc(nil)
, hstmt(nil)
, flags(0)
, bindCol(0)
, bindParam(0)
, timeoutSecs(0)
, data(nil)
, errHandler(nil)
, errHandlerParam(nil)
{
debug[0] = 0;
if (conn) {
// This is a real statement, so add it to the statement count
++conn->currentConns;
sequence = conn->sequence;
}
else {
// This statement is a list marker object
sequence = 0;
}
}
//============================================================================
SqlStmt::~SqlStmt () {
int result;
Reset();
if (hstmt) {
result = SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
LogStmtError(result, this, L"SQLFreeHandle");
AtomicAdd(&s_perf[kSqlConnPerfConnCurrent], -1);
}
if (flags & kStmtFlagDriverConnected) {
ASSERT(hdbc);
result = SQLDisconnect(hdbc);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLDisconnect", debug);
}
if (hdbc) {
result = SQLFreeHandle(SQL_HANDLE_DBC, hdbc);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLFreeHandle", debug);
}
if (conn)
--conn->currentConns;
}
//============================================================================
bool SqlStmt::Initialize (const wchar connectStr[]) {
ASSERT(!hdbc);
for (;;) {
// Allocate connection handle
int result;
result = SQLAllocHandle(
SQL_HANDLE_DBC,
conn->henv,
&hdbc
);
LogErr(result, SQL_HANDLE_ENV, conn->henv, L"SQLAllocHandle(dbc)", debug);
if (!SQL_SUCCEEDED(result))
break;
// Set login timeout
/* -- Crashes EasySoft Oracle driver
-- Not supported by Oracle's driver
result = SQLSetConnectAttr(
hdbc,
SQL_ATTR_LOGIN_TIMEOUT,
(SQLPOINTER) &kLoginTimeoutSecs,
SQL_IS_UINTEGER
);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLSetConnectAttr(loginTimeout)", debug);
if (!SQL_SUCCEEDED(result))
break;
*/
#ifdef ODBC_TRACING
result = SQLSetConnectAttr(
hdbc,
SQL_ATTR_TRACEFILE,
"odbc.log",
SQL_NTS
);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLSetConnectAttr(tracefile)", debug);
result = SQLSetConnectAttr(
hdbc,
SQL_ATTR_TRACE,
(SQLPOINTER) SQL_OPT_TRACE_ON,
SQL_IS_INTEGER
);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLSetConnectAttr(trace)", debug);
#endif
/* -- Crashes EasySoft Oracle driver
-- Not supported by Oracle's driver
result = SQLSetConnectAttr(
hdbc,
SQL_ATTR_CONNECTION_TIMEOUT,
(SQLPOINTER) &kConnectionTimeoutSecs,
SQL_IS_UINTEGER
);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLSetConnectAttr(connectTimeout)", debug);
if (!SQL_SUCCEEDED(result))
break;
*/
// Perform driver connection
SQLWCHAR outConnectStr[1024];
SQLSMALLINT outConnectLen;
result = SQLDriverConnectW(
hdbc,
(HWND) nil,
(SQLWCHAR *) connectStr,
SQL_NTS,
outConnectStr,
(SQLSMALLINT) arrsize(outConnectStr),
&outConnectLen,
SQL_DRIVER_NOPROMPT
);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLDriverConnect()", debug);
if (!SQL_SUCCEEDED(result))
break;
flags |= kStmtFlagDriverConnected;
// Create statement for connection
result = SQLAllocHandle(
SQL_HANDLE_STMT,
hdbc,
&hstmt
);
LogStmtError(result, this, L"SQLAllocHandle(stmt)");
if (!SQL_SUCCEEDED(result)) {
ASSERT(!hstmt);
break;
}
// Success!
AtomicAdd(&s_perf[kSqlConnPerfConnCurrent], 1);
return true;
}
// Failure!
return false;
}
//============================================================================
void SqlStmt::Reset () {
flags &= ~kStmtFlagReset;
prepare = nil;
SqlConnBindColReset(this);
SqlConnBindParameterReset(this);
#ifdef ORACLE_FREE_DRIVER
{ // Oracle's driver can't handle cached stmts, so blow it all away.
int result;
// Destroy old statement
if (hstmt) {
result = SQLFreeHandle(SQL_HANDLE_STMT, hstmt);
LogStmtError(result, this, L"SQLFreeHandle");
}
// Create new statement
result = SQLAllocHandle(
SQL_HANDLE_STMT,
hdbc,
&hstmt
);
LogStmtError(result, this, L"SQLAllocHandle(stmt)");
if (!SQL_SUCCEEDED(result))
ASSERT(!hstmt);
}
#endif // ORACLE_FREE_DRIVER
FREE(data);
data = nil;
debug[0] = 0;
}
//============================================================================
bool SqlStmt::QueryDead (unsigned method) {
SQLUINTEGER dead;
int result = SQLGetConnectAttr(
hdbc,
method,
&dead,
SQL_IS_UINTEGER,
nil
);
LogErr(result, SQL_HANDLE_DBC, hdbc, L"SQLGetConnectAttr(dead)", debug);
if (!SQL_SUCCEEDED(result))
return false;
return dead == SQL_CD_TRUE;
}
/*****************************************************************************
*
* StmtConn
*
***/
//============================================================================
SqlConn::SqlConn (
const wchar connectStr[],
SQLHENV henv
) : henv(henv)
, flags(0)
, desiredConns(0)
, currentConns(0)
, connectTasks(0)
, checkDeadTasks(0)
, sequence(0)
, timeoutSecs(0)
, connectStr(StrDup(connectStr))
, taskList(AsyncThreadTaskListCreate())
{}
//===========================================================================
SqlConn::~SqlConn () {
ASSERT(!freeStmts.Head());
ASSERT(!stmts.Head());
DEL(connectStr);
SQLFreeHandle(SQL_HANDLE_ENV, henv);
AsyncThreadTaskListDestroy(taskList, kNetErrRemoteShutdown);
AtomicAdd(&s_perf[kSqlConnPerfConnDesired], - (long) desiredConns);
}
/****************************************************************************
*
* Connection management functions
*
***/
//============================================================================
bool SqlConn::GrowConnections_CS (unsigned attempts) {
for (unsigned i = 0; i < attempts; ++i) {
// If the maximum number of connections has been reached then bail
if (currentConns >= desiredConns)
break;
// If the server decided to shut down then bail
if (flags & kConnFlagInvalid)
break;
// Leave the critical section to perform connection
SqlStmt * stmt = NEW(SqlStmt)(this);
// Ensure that the connection string is valid
// for the duration of the initialization by
// creating a reference to the string.
critsect.Leave();
bool result = stmt->Initialize(connectStr);
critsect.Enter();
// If the connection failed then bail
if (!result) {
DEL(stmt);
return false;
}
// Add new connection to free list
freeStmts.Add(stmt);
stmts.Link(stmt);
}
// Return true only if all connection attempts were successful
return true;
}
//============================================================================
static void SqlConnConnectCallback (void * param, ENetError error) {
SqlConn & conn = * (SqlConn *) param;
AtomicAdd(&s_perf[kSqlConnPerfConnPending], 1);
conn.critsect.Enter();
{
if (!error)
conn.GrowConnections_CS((unsigned) -1);
conn.connectTasks -= 1;
}
conn.critsect.Leave();
AtomicAdd(&s_perf[kSqlConnPerfConnPending], -1);
}
//============================================================================
void SqlConn::AsyncGrowConnections_CS () {
// If the conn structure is being destroyed
// then it cannot initiate any new connections
if (flags & kConnFlagInvalid)
return;
// How many additional tasks need to be started in
// order to reach the desired number of connections?
unsigned tasks = desiredConns - currentConns - connectTasks;
if ((int) tasks <= 0)
return;
// Set upper bound on connection tasks
if (connectTasks + tasks > kConnectionTaskCount)
tasks = kConnectionTaskCount - connectTasks;
// Initiate connection tasks
connectTasks += tasks;
for (unsigned i = 0; i < tasks; ++i) {
AsyncThreadTaskAdd(
taskList,
SqlConnConnectCallback,
this,
L"pnSqlConn.SqlConn::AsyncGrowConnections_CS"
);
}
}
/****************************************************************************
*
* CheckDead management functions
*
***/
//============================================================================
void SqlConn::CheckDead_CS () {
// Use a list-position marker to allow this function to
// safely walk through the linked list even though it
// leaves the critical section.
SqlStmt marker(nil);
stmts.Link(&marker, kListHead);
while (SqlStmt * stmt = marker.listLink.Next()) {
// Move the marker to the next location
stmts.Link(&marker, kListLinkAfter, stmt);
// The statement can't be used if either:
// - it is in use
// - it is a marker
if (!stmt->hashLink.IsLinked())
continue;
// If the statement has already been processed during
// this generation then do not process it again
if ((int) (sequence - stmt->sequence) <= 0)
continue;
// Prevent this statement from being used during check
stmt->sequence = sequence;
stmt->hashLink.Unlink();
// Leave the critical section to check connection
critsect.Leave();
bool dead = stmt->QueryDead(SQL_ATTR_CONNECTION_DEAD);
critsect.Enter();
// Deallocate the statement if it's bogus
if (dead) {
DEL(stmt);
AsyncGrowConnections_CS();
}
else {
freeStmts.Add(stmt);
}
// If the server decided to shut down then bail
if (flags & kConnFlagInvalid)
break;
}
}
//============================================================================
static void SqlConnCheckDeadCallback (void * param, ENetError error) {
SqlConn & conn = * (SqlConn *) param;
AtomicAdd(&s_perf[kSqlConnPerfConnCheckDead], 1);
conn.critsect.Enter();
{
if (!error)
conn.CheckDead_CS();
conn.checkDeadTasks -= 1;
}
conn.critsect.Leave();
AtomicAdd(&s_perf[kSqlConnPerfConnCheckDead], -1);
}
//============================================================================
void SqlConn::AsyncCheckDead_CS () {
// Don't start new checking tasks while there are others outstanding
if (checkDeadTasks)
return;
// Start the next generation of check-dead tasks
++sequence;
checkDeadTasks = kCheckDeadTaskCount;
for (unsigned i = 0; i < kCheckDeadTaskCount; ++i) {
AsyncThreadTaskAdd(
taskList,
SqlConnCheckDeadCallback,
this,
L"pnSqlConn.SqlConn::AsyncCheckDead_CS"
);
}
}
/*****************************************************************************
*
* Exports
*
***/
//============================================================================
SqlConn * SqlConnCreate (
const wchar connectStr[],
unsigned maxConnections,
unsigned transTimeoutSeconds
) {
ASSERT(connectStr);
ASSERT(maxConnections);
/* Connection pooling not needed because connections
are held for the entire duration of the program.
SQLSetEnvAttr(
nil,
SQL_ATTR_CONNECTION_POOLING,
(SQLPOINTER) SQL_CP_ONE_PER_DRIVER,
SQL_IS_INTEGER
);
*/
// Allocate environment
SQLHENV henv;
int result = SQLAllocHandle(
SQL_HANDLE_ENV,
SQL_NULL_HANDLE,
&henv
);
LogErr(result, SQL_HANDLE_ENV, henv, L"SQLAllocHandle(env)", L"");
if (!SQL_SUCCEEDED(result))
return nil;
// Set ODBC version
result = SQLSetEnvAttr(
henv,
SQL_ATTR_ODBC_VERSION,
(SQLPOINTER) SQL_OV_ODBC3,
0
);
LogErr(result, SQL_HANDLE_ENV, henv, L"SQLSetEnvAttr(version)", L"");
// Allocate a connection record
SqlConn * conn = NEW(SqlConn)(connectStr, henv);
// Update configuration options
conn->critsect.Enter();
{
// Update timeout
conn->timeoutSecs = transTimeoutSeconds;
// Update connection count
int delta = (int) (maxConnections - conn->desiredConns);
AtomicAdd(&s_perf[kSqlConnPerfConnDesired], delta);
conn->desiredConns += delta;
// Create more connections
conn->AsyncGrowConnections_CS();
}
conn->critsect.Leave();
return conn;
}
//============================================================================
void SqlConnShutdown (SqlConn * conn) {
conn->critsect.Enter();
{
conn->flags |= kConnFlagInvalid;
SqlStmt * stmt = conn->stmts.Head();
for (; stmt; stmt = conn->stmts.Next(stmt))
SQLCancel(stmt->hstmt);
}
conn->critsect.Leave();
}
//============================================================================
void SqlConnDestroy (SqlConn * conn) {
for (;; AsyncSleep(1)) {
bool wait;
conn->critsect.Enter();
{
// Signal shutdown
conn->flags |= kConnFlagInvalid;
// Delete free and disconnected statements
conn->freeStmts.Clear();
// Wait until tasks are complete and statements have been destroyed
wait = conn->currentConns || conn->connectTasks || conn->checkDeadTasks;
}
conn->critsect.Leave();
if (wait)
continue;
// Complete!
break;
}
DEL(conn);
}
//============================================================================
void SqlConnFreeStmt (SqlStmt * stmt) {
ASSERT(stmt);
ASSERT(stmt->listLink.IsLinked());
ASSERT(!stmt->hashLink.IsLinked());
SqlConnCloseCursor(stmt);
#ifdef ORACLE_FREE_DRIVER
{ // Oracle's driver can't handle cached stmts, so blow it all away.
stmt->flags |= kStmtFlagReset;
}
#endif // ORACLE_FREE_DRIVER
// If this statement was used for an ad hoc query
// then it can't be cached, so reset the bindings
if (!stmt->prepare || (stmt->flags & kStmtFlagReset))
stmt->Reset();
bool dead = (stmt->flags & kStmtFlagDelete) || stmt->QueryDead(SQL_ATTR_CONNECTION_DEAD);
SqlConn * conn = stmt->conn;
conn->critsect.Enter();
{
if (stmt->flags & kStmtFlagDelete) {
DEL(stmt);
conn->AsyncGrowConnections_CS();
}
else if (dead) {
DEL(stmt);
conn->AsyncCheckDead_CS();
}
else {
conn->freeStmts.Add(stmt);
}
}
conn->critsect.Leave();
}
//============================================================================
void SqlStmtSetAttr (
SqlStmt * stmt,
int attr,
void * valPtr,
int strLen
) {
ASSERT(stmt);
ASSERT(!stmt->prepare);
int result = SQLSetStmtAttr(
stmt->hstmt,
(SQLINTEGER)attr,
(SQLPOINTER)valPtr,
(SQLINTEGER)strLen
);
LogErr(result, SQL_HANDLE_STMT, stmt->hstmt, L"SQLSetStmtAttr", nil);
}
//============================================================================
SqlStmt * SqlConnAllocStmt (SqlConn * conn) {
return SqlConnAllocStmt(conn, nil, nil);
}
//============================================================================
SqlStmt * SqlConnAllocStmt (
SqlConn * conn,
FSqlBindPrepare prepare,
byte ** bindData // [OUT]
) {
ASSERT(prepare || !bindData);
if (!conn)
return nil;
SqlStmt * stmt;
FSqlBindPrepare reset = nil;
FSqlBindPrepare cached = prepare;
unsigned timeoutSeconds = 0;
conn->critsect.Enter();
{
// Get the transaction timeout value
timeoutSeconds = conn->timeoutSecs;
for (;;) {
// Is the server permanently dead?
if (conn->flags & kConnFlagInvalid) {
prepare = nil;
stmt = nil;
break;
}
// If there is already a cached statement that has
// been prepared with the same data then recycle it
if (prepare && (nil != (stmt = conn->freeStmts.Find(SqlStmtHash(prepare))))) {
*bindData = stmt->data;
prepare = nil;
conn->freeStmts.Unlink(stmt);
break;
}
// If there is a statement that hasn't been prepared then use it now
if (nil != (stmt = conn->freeStmts.Find(SqlStmtHash(nil)))) {
ASSERT(!stmt->data);
conn->freeStmts.Unlink(stmt);
break;
}
// Take the least recently used item from the table and reinitialize
if (nil != (stmt = conn->freeStmts.Head())) {
ASSERT(stmt->prepare);
ASSERT(stmt->data);
reset = stmt->prepare;
conn->freeStmts.Unlink(stmt);
break;
}
if (conn->desiredConns == conn->currentConns) {
// Since there aren't enough statements on the free list,
// allocate new connections to the server. Since this is
// a very time-consuming operation, and it means that there
// isn't a surplus of connections for caching (more connections
// than threads, so that statements can be cached), this is a
// very serious error.
LogMsg(kLogError, "SqlConn: no free statements");
AtomicAdd(&s_perf[kSqlConnPerfConnDesired], 50);
conn->desiredConns += 50;
}
// Don't allow too many threads to be performing connection tasks
// so that this module doesn't starve the rest of the system
bool result = conn->connectTasks < kConnectionTaskCount;
if (result) {
// There is a crash bug where when the first connection to the
// server is allocated and then immediately used, but it occurs
// on the second use of the statement. I have no idea why this
// bug occurs.
++conn->connectTasks;
conn->AsyncGrowConnections_CS();
result = conn->GrowConnections_CS(5);
--conn->connectTasks;
}
// Did the connection attempt fail?
if (!result) {
prepare = nil;
stmt = nil;
break;
}
}
// If at any time there aren't connections then create more of them!
if (stmt && (conn->desiredConns != conn->currentConns))
conn->AsyncGrowConnections_CS();
}
conn->critsect.Leave();
// If no statement could be allocated then bail
if (!stmt)
return nil;
// Ensure that statement was removed from the free list
ASSERT(!stmt->hashLink.IsLinked());
if (reset) {
stmt->Reset();
}
if (stmt->timeoutSecs != timeoutSeconds) {
stmt->timeoutSecs = timeoutSeconds;
int result = SQLSetConnectAttr(
stmt->hdbc,
SQL_ATTR_QUERY_TIMEOUT,
(SQLPOINTER) timeoutSeconds,
SQL_IS_UINTEGER
);
LogErr(result, SQL_HANDLE_DBC, stmt->hdbc, L"SQLSetConnectAttr(queryTimeout)", stmt->debug);
}
if (prepare) {
ARRAY(byte) data;
prepare(stmt, &data);
stmt->prepare = prepare;
stmt->data = data.Detach();
*bindData = stmt->data;
AtomicAdd(&s_perf[kSqlConnPerfCacheMisses], 1);
}
else if (cached) {
AtomicAdd(&s_perf[kSqlConnPerfCacheHits], 1);
}
return stmt;
}
//============================================================================
void SqlConnSetErrorHandler (
SqlStmt * stmt,
FSqlConnErrorHandler handler,
void * userParam
) {
stmt->errHandler = handler;
stmt->errHandlerParam = userParam;
}
//============================================================================
void SqlConnBindColReset (SqlStmt * stmt) {
ASSERT(!stmt->prepare);
if (stmt->bindCol) {
SQLFreeStmt(stmt->hstmt, SQL_UNBIND);
stmt->bindCol = 0;
}
if (stmt->flags & kStmtFlagBindColMode) {
SqlConnBindColMode(
stmt,
nil, // rowCountPtr
0, // structSize
1, // arraySize
nil // statusArrayPtr
);
stmt->flags &= ~kStmtFlagBindColMode;
}
}
//============================================================================
void SqlConnBindColMode (
SqlStmt * stmt,
SQLUINTEGER * rowCount, // SQL_ATTR_ROWS_FETCHED_PTR
SQLUINTEGER structSize, // SQL_ATTR_ROW_BIND_TYPE
SQLUINTEGER arraySize, // SQL_ATTR_ROW_ARRAY_SIZE
SQLUSMALLINT * statusArray // SQL_ATTR_ROW_STATUS_PTR
) {
ASSERT(!stmt->prepare);
// Bind mode set to non-default value, so it
// must be reset before statement is re-used
stmt->flags |= kStmtFlagBindColMode;
// Set rowCount
int result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_ROWS_FETCHED_PTR, rowCount, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
// Set row/col binding
result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_ROW_BIND_TYPE, (SQLPOINTER) structSize, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
// Set number of elements in parameter arrays
result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_ROW_ARRAY_SIZE, (SQLPOINTER) arraySize, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
// Set status array
result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_ROW_STATUS_PTR, statusArray, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
}
//============================================================================
void SqlConnBindCol (
SqlStmt * stmt,
SQLINTEGER targetType,
SQLPOINTER targetValue,
SQLINTEGER bufferLength,
SQLINTEGER * indPtr
) {
ASSERT(!stmt->prepare);
int result = SQLBindCol(
stmt->hstmt,
(SQLUSMALLINT) ++stmt->bindCol,
(SQLSMALLINT) targetType,
targetValue,
bufferLength,
indPtr
);
LogStmtError(result, stmt, L"SQLBindCol");
}
//============================================================================
void SqlConnBindParameterReset (SqlStmt * stmt) {
ASSERT(!stmt->prepare);
if (stmt->bindParam) {
SQLFreeStmt(stmt->hstmt, SQL_RESET_PARAMS);
stmt->bindParam = 0;
}
if (stmt->flags & kStmtFlagBindParamMode) {
SqlConnBindParameterMode(
stmt,
nil, // processCountPtr
0, // structSize
1, // arraySize
nil // statusArrayPtr
);
stmt->flags &= ~kStmtFlagBindParamMode;
}
}
//============================================================================
void SqlConnBindParameterMode (
SqlStmt * stmt,
SQLUINTEGER * processCount, // SQL_ATTR_PARAMS_PROCESSED_PTR
SQLUINTEGER structSize, // SQL_ATTR_PARAM_BIND_TYPE
SQLUINTEGER arraySize, // SQL_ATTR_PARAMSET_SIZE
SQLUSMALLINT * statusArray // SQL_ATTR_PARAM_STATUS_PTR
) {
ASSERT(!stmt->prepare);
// Bind mode set to non-default value, so it
// must be reset before statement is re-used
stmt->flags |= kStmtFlagBindParamMode;
// Set processCount
int result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_PARAMS_PROCESSED_PTR, processCount, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
// Set row/col binding
result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_PARAM_BIND_TYPE, (SQLPOINTER) structSize, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
// Set number of elements in parameter arrays
result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_PARAMSET_SIZE, (SQLPOINTER) arraySize, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
// Set status array
result = SQLSetStmtAttr(stmt->hstmt, SQL_ATTR_PARAM_STATUS_PTR, statusArray, 0);
LogStmtError(result, stmt, L"SQLSetStmtAttr");
}
//============================================================================
void SqlConnBindParameter (
SqlStmt * stmt,
SQLINTEGER inputOutputType,
SQLINTEGER valueType,
SQLINTEGER parameterType,
SQLUINTEGER columnSize,
SQLINTEGER decimalDigits,
SQLPOINTER parameterValuePtr,
SQLINTEGER bufferLength,
SQLINTEGER * indPtr
) {
ASSERT(!stmt->prepare);
int result = SQLBindParameter(
stmt->hstmt,
(SQLUSMALLINT) ++stmt->bindParam,
(SQLSMALLINT) inputOutputType,
(SQLSMALLINT) valueType,
(SQLSMALLINT) parameterType,
columnSize,
(SQLSMALLINT) decimalDigits,
parameterValuePtr,
bufferLength,
indPtr
);
LogStmtError(result, stmt, L"SQLBindParameter");
}
//============================================================================
void SqlConnBindParameterInt (
SqlStmt * stmt,
SQLINTEGER inputOutputType,
SQLINTEGER * parameterValuePtr,
SQLINTEGER * indPtr
) {
SqlConnBindParameter(
stmt,
inputOutputType,
SQL_C_LONG,
SQL_INTEGER,
0,
0,
parameterValuePtr,
0,
indPtr
);
}
//============================================================================
void SqlConnBindParameterUInt (
SqlStmt * stmt,
SQLINTEGER inputOutputType,
SQLUINTEGER * parameterValuePtr,
SQLINTEGER * indPtr
) {
SqlConnBindParameter(
stmt,
inputOutputType,
SQL_C_ULONG,
SQL_INTEGER,
0,
0,
parameterValuePtr,
0,
indPtr
);
}
//============================================================================
void SqlConnBindParameterString (
SqlStmt * stmt,
SQLINTEGER inputOutputType,
SQLUINTEGER columnSize, // bytes, NOT chars
SQLWCHAR * parameterValuePtr,
SQLINTEGER * indPtr
) {
SqlConnBindParameter(
stmt,
inputOutputType,
SQL_C_WCHAR,
SQL_WVARCHAR,
columnSize,
0,
parameterValuePtr,
inputOutputType == SQL_PARAM_OUTPUT ? columnSize : 0,
indPtr
);
}
//============================================================================
void SqlConnBindParameterStringA (
SqlStmt * stmt,
SQLINTEGER inputOutputType,
SQLUINTEGER columnSize, // bytes, NOT chars
SQLCHAR * parameterValuePtr,
SQLINTEGER * indPtr
) {
SqlConnBindParameter(
stmt,
inputOutputType,
SQL_C_CHAR,
SQL_VARCHAR,
columnSize,
0,
parameterValuePtr,
inputOutputType == SQL_PARAM_OUTPUT ? columnSize : 0,
indPtr
);
}
//============================================================================
int SqlConnExecDirect (
SqlStmt * stmt,
const wchar string[]
) {
#ifdef LOG_SQL_STMTS
LogMsg(kLogDebug, L"SQL: %s", string);
#endif
StrCopy(stmt->debug, string, arrsize(stmt->debug));
int result = SQLExecDirectW(stmt->hstmt, const_cast<wchar *>(string), SQL_NTS);
LogStmtError(result, stmt, L"SqlExecute");
return result;
}
//============================================================================
int SqlConnPrepare (
SqlStmt * stmt,
const wchar string[]
) {
// Using {call ...} or {?= call ...} with SqlPrepare doesn't allow
// the ODBC expression parser to perform escape sequence fixup for
// return value and output parameters; to call stored procedures,
// use SqlConnExecDirect instead
#ifdef HS_DEBUGGING
ASSERT(string[0] != L'{');
#endif
StrCopy(stmt->debug, string, arrsize(stmt->debug));
int result = SQLPrepareW(stmt->hstmt, const_cast<wchar *>(string), SQL_NTS);
LogStmtError(result, stmt, L"SqlPrepare");
return result;
}
//============================================================================
int SqlConnExecute (SqlStmt * stmt) {
int result = SQLExecute(stmt->hstmt);
LogStmtError(result, stmt, L"SQLExecute");
return result;
}
//============================================================================
int SqlConnFetch (SqlStmt * stmt) {
int result = SQLFetch(stmt->hstmt);
LogStmtError(result, stmt, L"SQLFetch");
return result;
}
//============================================================================
int SqlConnMoreResults (SqlStmt * stmt) {
int result = SQLMoreResults(stmt->hstmt);
LogStmtError(result, stmt, L"SQLMoreResults");
return result;
}
//============================================================================
int SqlConnParamData (
SqlStmt * stmt,
SQLPOINTER * put
) {
int result = SQLParamData(stmt->hstmt, put);
LogStmtError(result, stmt, L"SQLParamData");
return result;
}
//============================================================================
bool SqlConnPutData (
SqlStmt * stmt,
SQLPOINTER data,
SQLINTEGER bytes
) {
int result = SQLPutData(stmt->hstmt, data, bytes);
LogStmtError(result, stmt, L"SQLPutData");
return SQL_SUCCEEDED(result);
}
//============================================================================
int SqlConnGetData (
SqlStmt * stmt,
SQLINTEGER columnNumber,
SQLINTEGER targetType,
SQLPOINTER targetValue,
SQLINTEGER bufferLength,
SQLINTEGER * indPtr
) {
int result = SQLGetData(
stmt->hstmt,
(SQLUSMALLINT) columnNumber,
(SQLSMALLINT) targetType,
targetValue,
bufferLength,
indPtr
);
LogStmtError(result, stmt, L"SQLGetData");
return result;
}
//============================================================================
void SqlConnCloseCursor (SqlStmt * stmt) {
int result = SQLFreeStmt(stmt->hstmt, SQL_CLOSE);
LogStmtError(result, stmt, L"SQLFreeStmt");
}
//============================================================================
int SqlConnNumResultCols (
SqlStmt * stmt
) {
// @@@ TODO: Ensure that statement has been executed
SQLSMALLINT colCount = 0;
int result = SQLNumResultCols(
stmt->hstmt,
&colCount
);
LogStmtError(result, stmt, L"SQLNumResultCols");
return colCount;
}
//============================================================================
int SqlConnDescribeCol (
SqlStmt * stmt,
SQLSMALLINT columnNumber,
SQLWCHAR * columnName,
SQLSMALLINT bufferLength,
SQLSMALLINT * nameLengthPtr,
SQLSMALLINT * dataTypePtr,
SQLUINTEGER * columnSizePtr,
SQLSMALLINT * decimalDigitsPtr,
SQLSMALLINT * nullablePtr
) {
int result = SQLDescribeColW(
stmt->hstmt,
columnNumber,
columnName,
bufferLength,
nameLengthPtr,
dataTypePtr,
columnSizePtr,
decimalDigitsPtr,
nullablePtr
);
LogStmtError(result, stmt, L"SQLDescribeCol");
return result;
}
//============================================================================
unsigned SqlConnGetPerf (unsigned id) {
ASSERT(id < arrsize(s_perf));
return (unsigned) s_perf[id];
}