我正在使用 autohotkey 进行 mysql 调用。mysql 接口是通过将一个visual basic api 引用到mysql 来破译的。
我正在使用这篇文章中引用的 mysql 连接调用：http ://www.autohotkey.com/forum/viewtopic.php?t=12482
我想添加一个 dllcall 来将此 perl 调用复制到 mysql_options...
mysql_options(mysql, MYSQL_OPT_RECONNECT, &true);
据我了解，此调用将使我的程序能够在标准的 8 小时 mysql 超时后优雅地重新连接到 mysql。我希望我的申请可以无限期保留。
这是我的代码。谷歌源代码库上的参考表明重新连接常量是 20。除了 mysql_opt_reconnect 调用之外，一切正常。
任何人都可以帮我确定对 libmysql.dll 的正确调用，以在 mysql 超时后让我的应用程序自动重新连接吗？
;============================================================
; mysql.ahk
;
; Provides a set of functions to connect and query a mysql database
;============================================================
FileInstall, libmysql.dll, %A_AppData%\libmysql.dll, 1
;============================================================
; Connect to mysql database and return db handle
;
; host = DTWRO-WS0061
; user = alan
; password = *******
; database = rush
;============================================================
dbConnect(host,user,password,database){
if (A_IsCompiled) {
ExternDir := A_AppData
} else {
ExternDir := A_WorkingDir
}
hModule := DllCall("LoadLibrary", "Str", ExternDir "\libmySQL.dll")
If (hModule = 0)
{
MsgBox 16, MySQL Error 233, Can't load libmySQL.dll from directory %ExternDir%
ExitApp
}
db := DllCall("libmySQL.dll\mysql_init", "UInt", 0)
If (db = 0)
{
MsgBox 16, MySQL Error 445, Not enough memory to connect to MySQL
ExitApp
}
; figure out how to turn on reconnect call!
; mysql_options(mysql, MYSQL_OPT_RECONNECT, &true);
value := DllCall("libmySQL.dll\mysql_options"
, "UInt", db
, "UInt", 20 ; is this the correct constant which represents MYSQL_OPT_RECONNECT?... see below
, "UInt", 1) ; true
connection := DllCall("libmySQL.dll\mysql_real_connect"
, "UInt", db
, "Str", host ; host name
, "Str", user ; user name
, "Str", password ; password
, "Str", database ; database name
, "UInt", 3306 ; port
, "UInt", 0 ; unix_socket
, "UInt", 0) ; client_flag
If (connection = 0)
{
HandleMySQLError(db, "Cannot connect to database")
Return
}
serverVersion := DllCall("libmySQL.dll\mysql_get_server_info", "UInt", db, "Str")
;MsgBox % "Ping database: " . DllCall("libmySQL.dll\mysql_ping", "UInt", db) . "`nServer version: " . serverVersion
return db
}
;============================================================
; mysql error handling
;============================================================
HandleMySQLError(db, message, query="") { ; the equal sign means optional
errorCode := DllCall("libmySQL.dll\mysql_errno", "UInt", db)
errorStr := DllCall("libmySQL.dll\mysql_error", "UInt", db, "Str")
MsgBox 16, MySQL Error: %message%, Error %errorCode%: %errorStr%`n`n%query%
Return
}
;============================================================
; mysql get address
;============================================================
GetUIntAtAddress(_addr, _offset)
{
local addr
addr := _addr + _offset * 4
Return *addr + (*(addr + 1) << 8) + (*(addr + 2) << 16) + (*(addr + 3) << 24)
}
;============================================================
; process query
;============================================================
dbQuery(_db, _query)
{
local resultString, result, requestResult, fieldCount
local row, lengths, length, fieldPointer, field
query4error := RegExReplace(_query , "\t", " ") ; convert tabs to spaces so error message formatting is legible
result := DllCall("libmySQL.dll\mysql_query", "UInt", _db , "Str", _query)
If (result != 0) {
errorMsg = %_query%
HandleMySQLError(_db, "dbQuery Fail", query4error)
Return
}
requestResult := DllCall("libmySQL.dll\mysql_store_result", "UInt", _db)
if (requestResult = 0) { ; call must have been an insert or delete ... a select would return results to pass back
return
}
fieldCount := DllCall("libmySQL.dll\mysql_num_fields", "UInt", requestResult)
Loop
{
row := DllCall("libmySQL.dll\mysql_fetch_row", "UInt", requestResult)
If (row = 0 || row == "")
Break
; Get a pointer on a table of lengths (unsigned long)
lengths := DllCall("libmySQL.dll\mysql_fetch_lengths" , "UInt", requestResult)
Loop %fieldCount%
{
length := GetUIntAtAddress(lengths, A_Index - 1)
fieldPointer := GetUIntAtAddress(row, A_Index - 1)
VarSetCapacity(field, length)
DllCall("lstrcpy", "Str", field, "UInt", fieldPointer)
resultString := resultString . field
If (A_Index < fieldCount)
resultString := resultString . "|" ; seperator for fields
}
resultString := resultString . "`n" ; seperator for records
}
; remove last newline from resultString
resultString := RegExReplace(resultString , "`n$", "")
Return resultString
}