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HeidiSQL/source/mysql_connection.pas

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unit mysql_connection;
interface
uses
Classes, SysUtils, windows, mysql_api, mysql_structures, SynRegExpr, Contnrs, Generics.Collections, Generics.Defaults,
DateUtils, Types, ShellApi;
type
{ TDBObjectList and friends }
TListNodeType = (lntNone, lntDb, lntTable, lntView, lntFunction, lntProcedure, lntTrigger, lntColumn);
TListNodeTypes = Set of TListNodeType;
TDBObject = class
Name, Database, Engine, Comment, RowFormat, CreateOptions, Collation, ObjType: String;
Created, Updated, LastChecked: TDateTime;
Rows, Size, Version, AvgRowLen, MaxDataLen, IndexLen, DataLen, DataFree, AutoInc, CheckSum: Int64;
NodeType: TListNodeType;
end;
PDBObject = ^TDBObject;
TDBObjectList = TObjectList<TDBObject>;
TDBObjectComparer = class(TComparer<TDBObject>)
function Compare(const Left, Right: TDBObject): Integer; override;
end;
{$M+} // Needed to add published properties
{ TConnectionParameters and friends }
TNetType = (ntTCPIP, ntNamedPipe, ntSSHtunnel);
TMySQLClientOption = (
opCompress, // CLIENT_COMPRESS
opConnectWithDb, // CLIENT_CONNECT_WITH_DB
opFoundRows, // CLIENT_FOUND_ROWS
opIgnoreSigpipe, // CLIENT_IGNORE_SIGPIPE
opIgnoreSpace, // CLIENT_IGNORE_SPACE
opInteractive, // CLIENT_INTERACTIVE
opLocalFiles, // CLIENT_LOCAL_FILES
opLongFlag, // CLIENT_LONG_FLAG
opLongPassword, // CLIENT_LONG_PASSWORD
opMultiResults, // CLIENT_MULTI_RESULTS
opMultiStatements, // CLIENT_MULTI_STATEMENTS
opNoSchema, // CLIENT_NO_SCHEMA
opODBC, // CLIENT_ODBC
opProtocol41, // CLIENT_PROTOCOL_41
opRememberOptions, // CLIENT_REMEMBER_OPTIONS
opReserved, // CLIENT_RESERVED
opSecureConnection, // CLIENT_SECURE_CONNECTION
opSSL, // CLIENT_SSL
opTransactions // CLIENT_TRANSACTIONS
);
TMySQLClientOptions = set of TMySQLClientOption;
TConnectionParameters = class(TObject)
strict private
FNetType: TNetType;
FHostname, FUsername, FPassword, FStartupScriptFilename,
FSSLPrivateKey, FSSLCertificate, FSSLCACertificate,
FSSHHost, FSSHUser, FSSHPassword, FSSHPlinkExe, FSSHPrivateKey: String;
FPort, FSSHPort, FSSHLocalPort: Integer;
FOptions: TMySQLClientOptions;
public
constructor Create;
published
property NetType: TNetType read FNetType write FNetType;
property Hostname: String read FHostname write FHostname;
property Port: Integer read FPort write FPort;
property Username: String read FUsername write FUsername;
property Password: String read FPassword write FPassword;
property StartupScriptFilename: String read FStartupScriptFilename write FStartupScriptFilename;
property Options: TMySQLClientOptions read FOptions write FOptions;
property SSHHost: String read FSSHHost write FSSHHost;
property SSHPort: Integer read FSSHPort write FSSHPort;
property SSHUser: String read FSSHUser write FSSHUser;
property SSHPassword: String read FSSHPassword write FSSHPassword;
property SSHPrivateKey: String read FSSHPrivateKey write FSSHPrivateKey;
property SSHLocalPort: Integer read FSSHLocalPort write FSSHLocalPort;
property SSHPlinkExe: String read FSSHPlinkExe write FSSHPlinkExe;
property SSLPrivateKey: String read FSSLPrivateKey write FSSLPrivateKey;
property SSLCertificate: String read FSSLCertificate write FSSLCertificate;
property SSLCACertificate: String read FSSLCACertificate write FSSLCACertificate;
end;
{ TMySQLConnection }
TMySQLLogCategory = (lcInfo, lcSQL, lcUserFiredSQL, lcError, lcDebug);
TMySQLLogEvent = procedure(Msg: String; Category: TMySQLLogCategory=lcInfo) of object;
TMySQLDatabaseEvent = procedure(Database: String) of object;
TMySQLQuery = class;
TMySQLConnection = class(TComponent)
private
FHandle: PMYSQL;
FActive: Boolean;
FConnectionStarted: Integer;
FServerStarted: Integer;
FParameters: TConnectionParameters;
FDatabase: String;
FLogPrefix: String;
FOnLog: TMySQLLogEvent;
FOnDatabaseChanged: TMySQLDatabaseEvent;
FOnAfterClearDBObjects: TMySQLDatabaseEvent;
FRowsFound: Int64;
FRowsAffected: Int64;
FServerVersionUntouched: String;
FLastQueryDuration, FLastQueryNetworkDuration: Cardinal;
FIsUnicode: Boolean;
FTableEngines: TStringList;
FTableEngineDefault: String;
FCollationTable: TMySQLQuery;
FCharsetTable: TMySQLQuery;
FInformationSchemaObjects: TStringList;
FDBObjectLists: TStringList;
FDBSizes: TStringList;
FObjectNamesInSelectedDB: TStrings;
FPlinkProcInfo: TProcessInformation;
procedure SetActive(Value: Boolean);
procedure SetDatabase(Value: String);
function GetThreadId: Cardinal;
function GetCharacterSet: String;
procedure SetCharacterSet(CharsetName: String);
function GetLastError: String;
function GetServerVersionStr: String;
function GetServerVersionInt: Integer;
function GetTableEngines: TStringList;
function GetCollationTable: TMySQLQuery;
function GetCollationList: TStringList;
function GetCharsetTable: TMySQLQuery;
function GetCharsetList: TStringList;
function GetInformationSchemaObjects: TStringList;
function GetConnectionUptime: Integer;
function GetServerUptime: Integer;
function ParseDateTime(Str: String): TDateTime;
procedure Log(Category: TMySQLLogCategory; Msg: String);
procedure ClearCache;
procedure SetObjectNamesInSelectedDB;
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
function Query(SQL: String; DoStoreResult: Boolean=False; LogCategory: TMySQLLogCategory=lcSQL): PMYSQL_RES;
function EscapeString(Text: String; ProcessJokerChars: Boolean=False): String;
function escChars(const Text: String; EscChar, Char1, Char2, Char3, Char4: Char): String;
function QuoteIdent(Identifier: String): String;
function DeQuoteIdent(Identifier: String): String;
function ConvertServerVersion(Version: Integer): String;
function GetResults(SQL: String): TMySQLQuery;
function GetCol(SQL: String; Column: Integer=0): TStringList;
function GetVar(SQL: String; Column: Integer=0): String; overload;
function GetVar(SQL: String; Column: String): String; overload;
function Ping: Boolean;
function GetDBObjects(db: String; Refresh: Boolean=False): TDBObjectList;
function GetDBSize(db: String): Int64;
function DbObjectsCached(db: String): Boolean;
procedure ClearDbObjects(db: String='');
property Parameters: TConnectionParameters read FParameters write FParameters;
property ThreadId: Cardinal read GetThreadId;
property ConnectionUptime: Integer read GetConnectionUptime;
property ServerUptime: Integer read GetServerUptime;
property CharacterSet: String read GetCharacterSet write SetCharacterSet;
property LastError: String read GetLastError;
property ServerVersionUntouched: String read FServerVersionUntouched;
property ServerVersionStr: String read GetServerVersionStr;
property ServerVersionInt: Integer read GetServerVersionInt;
property RowsFound: Int64 read FRowsFound;
property RowsAffected: Int64 read FRowsAffected;
property LastQueryDuration: Cardinal read FLastQueryDuration;
property LastQueryNetworkDuration: Cardinal read FLastQueryNetworkDuration;
property IsUnicode: Boolean read FIsUnicode;
property TableEngines: TStringList read GetTableEngines;
property TableEngineDefault: String read FTableEngineDefault;
property CollationTable: TMySQLQuery read GetCollationTable;
property CollationList: TStringList read GetCollationList;
property CharsetTable: TMySQLQuery read GetCharsetTable;
property CharsetList: TStringList read GetCharsetList;
property InformationSchemaObjects: TStringList read GetInformationSchemaObjects;
property ObjectNamesInSelectedDB: TStrings read FObjectNamesInSelectedDB write FObjectNamesInSelectedDB;
published
property Active: Boolean read FActive write SetActive default False;
property Database: String read FDatabase write SetDatabase;
property LogPrefix: String read FLogPrefix write FLogPrefix;
// Events
property OnLog: TMySQLLogEvent read FOnLog write FOnLog;
property OnDatabaseChanged: TMySQLDatabaseEvent read FOnDatabaseChanged write FOnDatabaseChanged;
property OnAfterClearDBObjects: TMySQLDatabaseEvent read FOnAfterClearDBObjects write FOnAfterClearDBObjects;
end;
{ TMySQLQuery }
TMySQLQuery = class(TComponent)
private
FSQL: String;
FConnection: TMySQLConnection;
FRecNo,
FRecordCount: Int64;
FColumnNames: TStringList;
FColumnLengths: TIntegerDynArray;
FLastResult: PMYSQL_RES;
FCurrentRow: PMYSQL_ROW;
FEof: Boolean;
FDatatypes: Array of TDatatype;
FLogCategory: TMySQLLogCategory;
FStoreResult: Boolean;
procedure SetSQL(Value: String);
procedure SetRecNo(Value: Int64);
public
constructor Create(AOwner: TComponent); override;
destructor Destroy; override;
procedure Execute;
procedure First;
procedure Next;
function ColumnCount: Integer;
function Col(Column: Integer; IgnoreErrors: Boolean=False): String; overload;
function Col(ColumnName: String; IgnoreErrors: Boolean=False): String; overload;
function BinColAsHex(Column: Integer; IgnoreErrors: Boolean=False): String;
function DataType(Column: Integer): TDataType;
function ColExists(Column: String): Boolean;
function ColIsPrimaryKeyPart(Column: Integer): Boolean;
function IsNull(Column: Integer): Boolean; overload;
function IsNull(Column: String): Boolean; overload;
function HasResult: Boolean;
property RecNo: Int64 read FRecNo write SetRecNo;
property Eof: Boolean read FEof;
property RecordCount: Int64 read FRecordCount;
property ColumnNames: TStringList read FColumnNames;
property LogCategory: TMySQLLogCategory read FLogCategory write FLogCategory;
property StoreResult: Boolean read FStoreResult write FStoreResult;
published
property SQL: String read FSQL write SetSQL;
property Connection: TMySQLConnection read FConnection write FConnection;
end;
implementation
{ TConnectionParameters }
constructor TConnectionParameters.Create;
begin
FNetType := ntTCPIP;
FHostname := DEFAULT_HOST;
FUsername := DEFAULT_USER;
FPassword := '';
FPort := DEFAULT_PORT;
FSSHPort := DEFAULT_SSHPORT;
FSSHLocalPort := FPort + 1;
FSSLPrivateKey := '';
FSSLCertificate := '';
FSSLCACertificate := '';
FStartupScriptFilename := '';
FOptions := [opCompress, opLocalFiles, opInteractive, opProtocol41, opMultiStatements];
end;
{ TMySQLConnection }
constructor TMySQLConnection.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FParameters := TConnectionParameters.Create;
FRowsFound := 0;
FRowsAffected := 0;
FConnectionStarted := 0;
FLastQueryDuration := 0;
FLastQueryNetworkDuration := 0;
FLogPrefix := '';
FIsUnicode := False;
FDBSizes := TStringList.Create;
end;
destructor TMySQLConnection.Destroy;
begin
if Active then Active := False;
ClearCache;
inherited Destroy;
end;
{**
(Dis-)Connect to/from server
}
procedure TMySQLConnection.SetActive( Value: Boolean );
var
Connected: PMYSQL;
ClientFlags, FinalPort: Integer;
Error, tmpdb, FinalHost, FinalSocket, PlinkCmd: String;
SSLResult: Byte;
UsingPass, Protocol, CurCharset: String;
StartupInfo: TStartupInfo;
ExitCode: LongWord;
begin
if Value and (FHandle = nil) then begin
// Get handle
FHandle := mysql_init(nil);
// Prepare connection
case FParameters.NetType of
ntTCPIP: Protocol := 'TCP/IP';
ntNamedPipe: Protocol := 'named pipe';
ntSSHtunnel: Protocol := 'SSH tunnel';
end;
if FParameters.Password <> '' then UsingPass := 'Yes' else UsingPass := 'No';
Log(lcInfo, 'Connecting to '+FParameters.Hostname+' via '+Protocol+
', username '+FParameters.Username+
', using password: '+UsingPass+' ...');
// Prepare special stuff for SSL and SSH tunnel
FinalHost := FParameters.Hostname;
FinalSocket := '';
FinalPort := FParameters.Port;
case FParameters.NetType of
ntTCPIP: begin
if (FParameters.SSLPrivateKey <> '') and
(FParameters.SSLCertificate <> '') and
(FParameters.SSLCACertificate <> '') then begin
FParameters.Options := FParameters.Options + [opSSL];
{ TODO : Use Cipher and CAPath parameters }
SSLResult := mysql_ssl_set(
FHandle,
PansiChar(AnsiString(FParameters.SSLPrivateKey)),
PansiChar(AnsiString(FParameters.SSLCertificate)),
PansiChar(AnsiString(FParameters.SSLCACertificate)),
{PansiChar(AnsiString(FParameters.CApath))}nil,
{PansiChar(AnsiString(FParameters.Cipher))}nil);
if SSLresult <> 0 then
raise Exception.CreateFmt('Could not connect using SSL (Error %d)', [SSLresult]);
end;
end;
ntNamedPipe: begin
FinalHost := '.';
FinalSocket := FParameters.Hostname;
end;
ntSSHtunnel: begin
// Build plink.exe command line
// plink bob@domain.com -pw myPassw0rd1 -P 22 -i "keyfile.pem" -L 55555:localhost:3306
PlinkCmd := FParameters.SSHPlinkExe + ' ';
if FParameters.SSHUser <> '' then
PlinkCmd := PlinkCmd + FParameters.SSHUser + '@';
if FParameters.SSHHost <> '' then
PlinkCmd := PlinkCmd + FParameters.SSHHost
else
PlinkCmd := PlinkCmd + FParameters.Hostname;
if FParameters.SSHPassword <> '' then
PlinkCmd := PlinkCmd + ' -pw ' + FParameters.SSHPassword;
PlinkCmd := PlinkCmd + ' -P ' + IntToStr(FParameters.SSHPort);
if FParameters.SSHPrivateKey <> '' then
PlinkCmd := PlinkCmd + ' -i "' + FParameters.SSHPrivateKey + '"';
PlinkCmd := PlinkCmd + ' -L ' + IntToStr(FParameters.SSHLocalPort) + ':' + FParameters.Hostname + ':' + IntToStr(FParameters.Port);
log(lcInfo, PlinkCmd);
// Create plink.exe process
FillChar(FPlinkProcInfo, SizeOf(TProcessInformation), 0);
FillChar(StartupInfo, SizeOf(TStartupInfo), 0);
StartupInfo.cb := SizeOf(TStartupInfo);
if CreateProcess(nil, PChar(PlinkCmd), nil, nil, false,
CREATE_DEFAULT_ERROR_MODE + NORMAL_PRIORITY_CLASS + CREATE_NO_WINDOW,
nil, nil, StartupInfo, FPlinkProcInfo) then begin
WaitForSingleObject(FPlinkProcInfo.hProcess, 1000);
GetExitCodeProcess(FPlinkProcInfo.hProcess, ExitCode);
if ExitCode <> STILL_ACTIVE then
raise Exception.Create('PLink exited unexpected. Command line was:'+CRLF+PlinkCmd);
end else begin
CloseHandle(FPlinkProcInfo.hProcess);
raise Exception.Create('Couldn''t execute PLink: '+CRLF+PlinkCmd);
end;
FinalHost := 'localhost';
FinalPort := FParameters.SSHLocalPort;
end;
end;
// Gather client options
ClientFlags := 0;
if opRememberOptions in FParameters.Options then ClientFlags := ClientFlags or CLIENT_REMEMBER_OPTIONS;
if opLongPassword in FParameters.Options then ClientFlags := ClientFlags or CLIENT_LONG_PASSWORD;
if opFoundRows in FParameters.Options then ClientFlags := ClientFlags or CLIENT_FOUND_ROWS;
if opLongFlag in FParameters.Options then ClientFlags := ClientFlags or CLIENT_LONG_FLAG;
if opConnectWithDb in FParameters.Options then ClientFlags := ClientFlags or CLIENT_CONNECT_WITH_DB;
if opNoSchema in FParameters.Options then ClientFlags := ClientFlags or CLIENT_NO_SCHEMA;
if opCompress in FParameters.Options then ClientFlags := ClientFlags or CLIENT_COMPRESS;
if opODBC in FParameters.Options then ClientFlags := ClientFlags or CLIENT_ODBC;
if opLocalFiles in FParameters.Options then ClientFlags := ClientFlags or CLIENT_LOCAL_FILES;
if opIgnoreSpace in FParameters.Options then ClientFlags := ClientFlags or CLIENT_IGNORE_SPACE;
if opProtocol41 in FParameters.Options then ClientFlags := ClientFlags or CLIENT_PROTOCOL_41;
if opInteractive in FParameters.Options then ClientFlags := ClientFlags or CLIENT_INTERACTIVE;
if opSSL in FParameters.Options then ClientFlags := ClientFlags or CLIENT_SSL;
if opIgnoreSigpipe in FParameters.Options then ClientFlags := ClientFlags or CLIENT_IGNORE_SIGPIPE;
if opTransactions in FParameters.Options then ClientFlags := ClientFlags or CLIENT_TRANSACTIONS;
if opReserved in FParameters.Options then ClientFlags := ClientFlags or CLIENT_RESERVED;
if opSecureConnection in FParameters.Options then ClientFlags := ClientFlags or CLIENT_SECURE_CONNECTION;
if opMultiStatements in FParameters.Options then ClientFlags := ClientFlags or CLIENT_MULTI_STATEMENTS;
if opMultiResults in FParameters.Options then ClientFlags := ClientFlags or CLIENT_MULTI_RESULTS;
if opRememberOptions in FParameters.Options then ClientFlags := ClientFlags or CLIENT_REMEMBER_OPTIONS;
Connected := mysql_real_connect(
FHandle,
PAnsiChar(Utf8Encode(FinalHost)),
PAnsiChar(Utf8Encode(FParameters.Username)),
PAnsiChar(Utf8Encode(FParameters.Password)),
nil,
FinalPort,
PAnsiChar(Utf8Encode(FinalSocket)),
ClientFlags
);
if Connected = nil then begin
Error := LastError;
Log(lcError, Error);
FConnectionStarted := 0;
FHandle := nil;
raise Exception.Create(Error);
end else begin
Log(lcInfo, 'Connected. Thread-ID: '+IntToStr(ThreadId));
FActive := True;
CharacterSet := 'utf8';
CurCharset := CharacterSet;
Log(lcInfo, 'Characterset: '+CurCharset);
FIsUnicode := CurCharset = 'utf8';
FConnectionStarted := GetTickCount div 1000;
FServerStarted := FConnectionStarted - StrToIntDef(GetVar('SHOW STATUS LIKE ''Uptime''', 1), 1);
FServerVersionUntouched := Utf8ToString(mysql_get_server_info(FHandle));
if FDatabase <> '' then begin
tmpdb := FDatabase;
FDatabase := '';
try
Database := tmpdb;
except
// Trigger OnDatabaseChange event for <no db> if wanted db is not available
FDatabase := tmpdb;
Database := '';
end;
end;
end;
end
else if (not Value) and (FHandle <> nil) then begin
mysql_close(FHandle);
FActive := False;
FConnectionStarted := 0;
FHandle := nil;
if FPlinkProcInfo.hProcess <> 0 then begin
TerminateProcess(FPlinkProcInfo.hProcess, 0);
CloseHandle(FPlinkProcInfo.hProcess);
end;
Log(lcInfo, 'Connection to '+FParameters.Hostname+' closed at '+DateTimeToStr(Now));
end;
end;
function TMySQLConnection.Ping: Boolean;
begin
if FActive and ((FHandle=nil) or (mysql_ping(FHandle) <> 0)) then begin
Active := False;
ClearCache;
end;
Result := FActive;
end;
{**
Executes a query
}
function TMySQLConnection.Query(SQL: String; DoStoreResult: Boolean=False; LogCategory: TMySQLLogCategory=lcSQL): PMYSQL_RES;
var
querystatus: Integer;
NativeSQL: AnsiString;
TimerStart: Cardinal;
begin
if not Ping then
Active := True;
Log(LogCategory, SQL);
if IsUnicode then
NativeSQL := UTF8Encode(SQL)
else
NativeSQL := AnsiString(SQL);
TimerStart := GetTickCount;
querystatus := mysql_real_query(FHandle, PAnsiChar(NativeSQL), Length(NativeSQL));
FLastQueryDuration := GetTickCount - TimerStart;
FLastQueryNetworkDuration := 0;
if querystatus <> 0 then begin
// Most errors will show up here, some others slightly later, after mysql_store_result()
Log(lcError, GetLastError);
raise Exception.Create(GetLastError);
end else begin
// We must call mysql_store_result() + mysql_free_result() to unblock the connection
// See: http://dev.mysql.com/doc/refman/5.0/en/mysql-store-result.html
FRowsAffected := mysql_affected_rows(FHandle);
TimerStart := GetTickCount;
Result := mysql_store_result(FHandle);
FLastQueryNetworkDuration := GetTickCount - TimerStart;
if (Result = nil) and (FRowsAffected = -1) then begin
// Indicates a late error, e.g. triggered by mysql_store_result(), after selecting a stored
// function with invalid SQL body. Also SHOW TABLE STATUS on older servers.
Log(lcError, GetLastError);
raise Exception.Create(GetLastError);
end;
if Result <> nil then begin
FRowsFound := mysql_num_rows(Result);
FRowsAffected := 0;
Log(lcDebug, IntToStr(RowsFound)+' rows found.');
if not DoStoreResult then
mysql_free_result(Result);
end else begin
// Query did not return a result
FRowsFound := 0;
Log(lcDebug, IntToStr(RowsAffected)+' rows affected.');
if UpperCase(Copy(SQL, 1, 3)) = 'USE' then begin
FDatabase := Trim(Copy(SQL, 4, Length(SQL)-3));
FDatabase := DeQuoteIdent(FDatabase);
Log(lcDebug, 'Database "'+FDatabase+'" selected');
if Assigned(FOnDatabaseChanged) then
FOnDatabaseChanged(Database);
end;
end;
end;
end;
{**
Set "Database" property and select that db if connected
}
procedure TMySQLConnection.SetDatabase(Value: String);
begin
if Value <> FDatabase then begin
if Value = '' then begin
FDatabase := Value;
if Assigned(FOnDatabaseChanged) then
FOnDatabaseChanged(Value);
end else
Query('USE '+QuoteIdent(Value), False);
SetObjectNamesInSelectedDB;
end;
end;
{**
Return current thread id
}
function TMySQLConnection.GetThreadId: Cardinal;
begin
Result := mysql_thread_id(FHandle);
end;
{**
Return currently used character set
}
function TMySQLConnection.GetCharacterSet: String;
begin
Result := Utf8ToString(mysql_character_set_name(FHandle));
end;
{**
Switch character set
}
procedure TMySQLConnection.SetCharacterSet(CharsetName: String);
begin
mysql_set_character_set(FHandle, PAnsiChar(Utf8Encode(CharsetName)));
end;
{**
Return the last error nicely formatted
}
function TMySQLConnection.GetLastError: String;
var
Msg, Additional: String;
rx: TRegExpr;
begin
Msg := Utf8ToString(mysql_error(FHandle));
// Find "(errno: 123)" in message and add more meaningful message from perror.exe
rx := TRegExpr.Create;
rx.Expression := '.+\(errno\:\s+(\d+)\)';
if rx.Exec(Msg) then begin
Additional := MySQLErrorCodes.Values[rx.Match[1]];
if Additional <> '' then
Msg := Msg + CRLF + CRLF + Additional;
end;
rx.Free;
Result := Format('SQL Error (%d): %s', [mysql_errno(FHandle), Msg]);
end;
{**
Get version string as normalized integer
"5.1.12-beta-community-123" => 50112
}
function TMySQLConnection.GetServerVersionInt: Integer;
var
i, dots: Byte;
v1, v2, v3: String;
begin
Result := -1;
dots := 0;
v1 := '';
v2 := '';
v3 := '';
for i:=1 to Length(FServerVersionUntouched) do begin
if FServerVersionUntouched[i] = '.' then begin
inc(dots);
// We expect exactly 2 dots.
if dots > 2 then
break;
end else if CharInSet(FServerVersionUntouched[i], ['0'..'9']) then begin
if dots = 0 then
v1 := v1 + FServerVersionUntouched[i]
else if dots = 1 then
v2 := v2 + FServerVersionUntouched[i]
else if dots = 2 then
v3 := v3 + FServerVersionUntouched[i];
end else // Don't include potential numbers of trailing string
break;
end;
// Concat tokens
if (Length(v1)>0) and (Length(v2)>0) and (Length(v3)>0) then begin
Result := StrToIntDef(v1, 0) *10000 +
StrToIntDef(v2, 0) *100 +
StrToIntDef(v3, 0);
end;
end;
function TMySQLConnection.GetServerVersionStr: String;
begin
Result := ConvertServerVersion(ServerVersionInt);
end;
{**
Convert integer version to real version string
}
function TMySQLConnection.ConvertServerVersion(Version: Integer): String;
var
v : String;
v1, v2 : Byte;
begin
v := IntToStr( Version );
v1 := StrToIntDef( v[2]+v[3], 0 );
v2 := StrToIntDef( v[4]+v[5], 0 );
Result := v[1] + '.' + IntToStr(v1) + '.' + IntToStr(v2);
end;
function TMySQLConnection.GetResults(SQL: String): TMySQLQuery;
begin
Result := TMySQLQuery.Create(Self);
Result.Connection := Self;
Result.SQL := SQL;
try
Result.Execute;
except
FreeAndNil(Result);
Raise;
end;
end;
{**
Call log event if assigned to object
}
procedure TMySQLConnection.Log(Category: TMySQLLogCategory; Msg: String);
begin
if Assigned(FOnLog) then
FOnLog(FLogPrefix+Msg, Category);
end;
{**
Escapes a string for usage in SQL queries
- single-backslashes which represent normal parts of the text and not escape-sequences
- characters which MySQL doesn't strictly care about, but which might confuse editors etc.
- single and double quotes in a text string
- joker-chars for LIKE-comparisons
Finally, surround the text by single quotes.
@param string Text to escape
@param boolean Escape text so it can be used in a LIKE-comparison
@return string
}
function TMySQLConnection.EscapeString(Text: String; ProcessJokerChars: Boolean=false): String;
var
c1, c2, c3, c4, EscChar: Char;
begin
c1 := '''';
c2 := '\';
c3 := '%';
c4 := '_';
EscChar := '\';
if not ProcessJokerChars then begin
// Do not escape joker-chars which are used in a LIKE-clause
c4 := '''';
c3 := '''';
end;
Result := escChars(Text, EscChar, c1, c2, c3, c4);
// Remove characters that SynEdit chokes on, so that
// the SQL file can be non-corruptedly loaded again.
c1 := #13;
c2 := #10;
c3 := #0;
c4 := #0;
// TODO: SynEdit also chokes on Char($2028) and possibly Char($2029).
Result := escChars(Result, EscChar, c1, c2, c3, c4);
if not ProcessJokerChars then begin
// Add surrounding single quotes only for non-LIKE-values
// because in all cases we're using ProcessLIKEChars we
// need to add leading and/or trailing joker-chars by hand
// without being escaped
Result := Char(#39) + Result + Char(#39);
end;
end;
{***
Attempt to do string replacement faster than StringReplace
}
function TMySQLConnection.escChars(const Text: String; EscChar, Char1, Char2, Char3, Char4: Char): String;
const
// Attempt to match whatever the CPU cache will hold.
block: Cardinal = 65536;
var
bstart, bend, matches, i: Cardinal;
// These could be bumped to uint64 if necessary.
len, respos: Cardinal;
next: Char;
begin
len := Length(Text);
Result := '';
bend := 0;
respos := 0;
repeat
bstart := bend + 1;
bend := bstart + block - 1;
if bend > len then bend := len;
matches := 0;
for i := bstart to bend do if
(Text[i] = Char1) or
(Text[i] = Char2) or
(Text[i] = Char3) or
(Text[i] = Char4)
then Inc(matches);
SetLength(Result, bend + 1 - bstart + matches + respos);
for i := bstart to bend do begin
next := Text[i];
if
(next = Char1) or
(next = Char2) or
(next = Char3) or
(next = Char4)
then begin
Inc(respos);
Result[respos] := EscChar;
// Special values for MySQL escape.
if next = #13 then next := 'r';
if next = #10 then next := 'n';
if next = #0 then next := '0';
end;
Inc(respos);
Result[respos] := next;
end;
until bend = len;
end;
{**
Add backticks to identifier
Todo: Support ANSI style
}
function TMySQLConnection.QuoteIdent(Identifier: String): String;
begin
Result := StringReplace(Identifier, '`', '``', [rfReplaceAll]);
Result := '`' + Result + '`';
end;
function TMySQLConnection.DeQuoteIdent(Identifier: String): String;
begin
Result := Identifier;
if (Result[1] = '`') and (Result[Length(Identifier)] = '`') then
Result := Copy(Result, 2, Length(Result)-2);
end;
function TMySQLConnection.GetCol(SQL: String; Column: Integer=0): TStringList;
var
Results: TMySQLQuery;
begin
Results := GetResults(SQL);
Result := TStringList.Create;
if Results.RecordCount > 0 then while not Results.Eof do begin
Result.Add(Results.Col(Column));
Results.Next;
end;
FreeAndNil(Results);
end;
{**
Get single cell value via SQL query, identified by column number
}
function TMySQLConnection.GetVar(SQL: String; Column: Integer=0): String;
var
Results: TMySQLQuery;
begin
Results := GetResults(SQL);
if Results.RecordCount > 0 then
Result := Results.Col(Column)
else
Result := '';
FreeAndNil(Results);
end;
{**
Get single cell value via SQL query, identified by column name
}
function TMySQLConnection.GetVar(SQL: String; Column: String): String;
var
Results: TMySQLQuery;
begin
Results := GetResults(SQL);
if Results.RecordCount > 0 then
Result := Results.Col(Column)
else
Result := '';
FreeAndNil(Results);
end;
function TMySQLConnection.GetTableEngines: TStringList;
var
ShowEngines, HaveEngines: TMySQLQuery;
engineName, engineSupport: String;
PossibleEngines: TStringList;
begin
if not Assigned(FTableEngines) then begin
FTableEngines := TStringList.Create;
try
ShowEngines := GetResults('SHOW ENGINES');
while not ShowEngines.Eof do begin
engineName := ShowEngines.Col('Engine');
engineSupport := LowerCase(ShowEngines.Col('Support'));
// Add to dropdown if supported
if engineSupport <> 'no' then
FTableEngines.Add(engineName);
// Check if this is the default engine
if engineSupport = 'default' then
FTableEngineDefault := engineName;
ShowEngines.Next;
end;
except
// Ignore errors on old servers and try a fallback:
// Manually fetch available engine types by analysing have_* options
// This is for servers below 4.1 or when the SHOW ENGINES statement has
// failed for some other reason
HaveEngines := GetResults('SHOW VARIABLES LIKE ''have%''');
// Add default engines which will not show in a have_* variable:
FTableEngines.CommaText := 'MyISAM,MRG_MyISAM,HEAP';
FTableEngineDefault := 'MyISAM';
// Possible other engines:
PossibleEngines := TStringList.Create;
PossibleEngines.CommaText := 'ARCHIVE,BDB,BLACKHOLE,CSV,EXAMPLE,FEDERATED,INNODB,ISAM';
while not HaveEngines.Eof do begin
engineName := copy(HaveEngines.Col(0), 6, Length(HaveEngines.Col(0)));
// Strip additional "_engine" suffix, fx from "have_blackhole_engine"
if Pos('_', engineName) > 0 then
engineName := copy(engineName, 0, Pos('_', engineName)-1);
engineName := UpperCase(engineName);
// Add engine to list if it's a) in HaveEngineList and b) activated
if (PossibleEngines.IndexOf(engineName) > -1)
and (LowerCase(HaveEngines.Col(1)) = 'yes') then
FTableEngines.Add(engineName);
HaveEngines.Next;
end;
end;
end;
Result := FTableEngines;
end;
function TMySQLConnection.GetCollationTable: TMySQLQuery;
begin
if (not Assigned(FCollationTable)) and (ServerVersionInt >= 40100) then
FCollationTable := GetResults('SHOW COLLATION');
if Assigned(FCollationTable) then
FCollationTable.First;
Result := FCollationTable;
end;
function TMySQLConnection.GetCollationList: TStringList;
var
c: TMySQLQuery;
begin
c := CollationTable;
Result := TStringList.Create;
if Assigned(c) then while not c.Eof do begin
Result.Add(c.Col('Collation'));
c.Next;
end;
end;
function TMySQLConnection.GetCharsetTable: TMySQLQuery;
begin
if (not Assigned(FCharsetTable)) and (ServerVersionInt >= 40100) then
FCharsetTable := GetResults('SHOW CHARSET');
Result := FCharsetTable;
end;
function TMySQLConnection.GetCharsetList: TStringList;
var
c: TMySQLQuery;
begin
c := CharsetTable;
Result := TStringList.Create;
if Assigned(c) then begin
c.First;
while not c.Eof do begin
Result.Add(c.Col('Description') + ' (' + c.Col('Charset') + ')');
c.Next;
end;
end;
end;
function TMySQLConnection.GetInformationSchemaObjects: TStringList;
begin
if not Assigned(FInformationSchemaObjects) then try
FInformationSchemaObjects := GetCol('SHOW TABLES FROM '+QuoteIdent('information_schema'));
except
// Gracefully return an empty list on old servers
FInformationSchemaObjects := TStringList.Create;
end;
Result := FInformationSchemaObjects;
end;
function TMySQLConnection.GetConnectionUptime: Integer;
begin
// Return seconds since last connect
if not FActive then
Result := 0
else
Result := Integer(GetTickCount div 1000) - FConnectionStarted;
end;
function TMySQLConnection.GetServerUptime: Integer;
begin
// Return server uptime in seconds
Result := Integer(GetTickCount div 1000) - FServerStarted;
end;
procedure TMySQLConnection.ClearCache;
begin
// Free cached lists and results. Called when the connection was closed and/or destroyed
FreeAndNil(FCollationTable);
FreeAndNil(FCharsetTable);
FreeAndNil(FTableEngines);
FreeAndNil(FInformationSchemaObjects);
ClearDbObjects;
FTableEngineDefault := '';
end;
procedure TMySQLConnection.ClearDbObjects(db: String='');
var
i, idx: Integer;
begin
// Free all cached database object lists, or, if db is passed, only that one
if not Assigned(FDBObjectLists) then
Exit;
if db <> '' then begin
i := FDBObjectLists.IndexOf(db);
if i = -1 then
Exit;
TDBObjectList(FDBObjectLists.Objects[i]).Free;
FDBObjectLists.Delete(i);
idx := FDBSizes.IndexOfName(db);
if idx > -1 then
FDBSizes.Delete(idx);
end else begin
for i:=0 to FDBObjectLists.Count-1 do
TDBObjectList(FDBObjectLists.Objects[i]).Free;
FreeAndNil(FDBObjectLists);
FDBSizes.Clear;
end;
if Assigned(FOnAfterClearDBObjects) then
FOnAfterClearDBObjects(db);
end;
function TMySQLConnection.DbObjectsCached(db: String): Boolean;
begin
// Check if a table list is stored in cache
Result := Assigned(FDBObjectLists) and (FDBObjectLists.IndexOf(db) > -1);
end;
function TMySQLConnection.ParseDateTime(Str: String): TDateTime;
var
rx: TRegExpr;
begin
// Parse a MySQL date / time string value into a TDateTime
Result := 0;
rx := TRegExpr.Create;
rx.Expression := '^(\d{4})\-(\d{2})\-(\d{2}) (\d{2})\:(\d{2})\:(\d{2})$';
if rx.Exec(Str) then try
Result := EncodeDateTime(
StrToIntDef(rx.Match[1], 0),
StrToIntDef(rx.Match[2], 1),
StrToIntDef(rx.Match[3], 1),
StrToIntDef(rx.Match[4], 0),
StrToIntDef(rx.Match[5], 0),
StrToIntDef(rx.Match[6], 0),
0 // milliseconds, unused
);
except
Result := 0;
end;
end;
function TMySQLConnection.GetDbObjects(db: String; Refresh: Boolean=False): TDBObjectList;
var
obj: TDBObject;
Results: TMySQLQuery;
rx: TRegExpr;
DBSize: Integer;
begin
// Cache and return a db's table list
if Refresh then
ClearDbObjects(db);
if DbObjectsCached(db) then
Result := FDBObjectLists.Objects[FDBObjectLists.IndexOf(db)] as TDBObjectList
else begin
Result := TDBObjectList.Create(TDBObjectComparer.Create);
Results := nil;
rx := TRegExpr.Create;
rx.ModifierI := True;
DBSize := 0;
// Tables and views
try
Results := GetResults('SHOW TABLE STATUS FROM '+QuoteIdent(db));
except
end;
if Assigned(Results) then begin
while not Results.Eof do begin
obj := TDBObject.Create;
Result.Add(obj);
obj.Name := Results.Col('Name');
obj.Database := db;
obj.Rows := StrToInt64Def(Results.Col('Rows'), -1);
if Results.IsNull('Data_length') or Results.IsNull('Index_length') then
Obj.Size := -1
else begin
Obj.Size := StrToInt64Def(Results.Col('Data_length'), 0) + StrToInt64Def(Results.Col('Index_length'), 0);
Inc(DBSize, Obj.Size);
end;
Obj.ObjType := 'TABLE';
Obj.NodeType := lntTable;
if Results.IsNull(1) and Results.IsNull(2) then begin // Engine column is NULL for views
Obj.NodeType := lntView;
Obj.ObjType := 'VIEW';
end;
Obj.Created := ParseDateTime(Results.Col('Create_time'));
Obj.Updated := ParseDateTime(Results.Col('Update_time'));
if Results.ColExists('Type') then
Obj.Engine := Results.Col('Type')
else
Obj.Engine := Results.Col('Engine');
Obj.Comment := Results.Col('Comment');
// Sanitize comment from automatically appendage
rx.Expression := '(;\s*)?InnoDB\s*free\:.*$';
Obj.Comment := rx.Replace(Obj.Comment, '', False);
Obj.Version := StrToInt64Def(Results.Col('Version', True), -1);
Obj.AutoInc := StrToInt64Def(Results.Col('Auto_increment'), -1);
Obj.RowFormat := Results.Col('Row_format');
Obj.AvgRowLen := StrToInt64Def(Results.Col('Avg_row_length'), -1);
Obj.MaxDataLen := StrToInt64Def(Results.Col('Max_data_length'), -1);
Obj.IndexLen := StrToInt64Def(Results.Col('Index_length'), -1);
Obj.DataLen := StrToInt64Def(Results.Col('Data_length'), -1);
Obj.DataFree := StrToInt64Def(Results.Col('Data_free'), -1);
Obj.LastChecked := ParseDateTime(Results.Col('Check_time'));
Obj.Collation := Results.Col('Collation', True);
Obj.CheckSum := StrToInt64Def(Results.Col('Checksum', True), -1);
Obj.CreateOptions := Results.Col('Create_options');
Results.Next;
end;
FreeAndNil(Results);
end;
// Stored functions
if ServerVersionInt >= 50000 then try
Results := GetResults('SHOW FUNCTION STATUS WHERE '+QuoteIdent('Db')+'='+EscapeString(db));
except
end;
if Assigned(Results) then begin
while not Results.Eof do begin
obj := TDBObject.Create;
Result.Add(obj);
obj.Name := Results.Col('Name');
obj.Database := db;
obj.Rows := -1;
Obj.Size := -1;
Obj.ObjType := 'FUNCTION';
Obj.NodeType := lntFunction;
Obj.Created := ParseDateTime(Results.Col('Created'));
Obj.Updated := ParseDateTime(Results.Col('Modified'));
Obj.Engine := '';
Obj.Comment := Results.Col('Comment');
Obj.Version := -1;
Obj.AutoInc := -1;
Obj.RowFormat := '';
Obj.AvgRowLen := -1;
Obj.MaxDataLen := -1;
Obj.IndexLen := -1;
Obj.DataLen := -1;
Obj.DataFree := -1;
Obj.LastChecked := 0;
Obj.Collation := '';
Obj.CheckSum := -1;
Obj.CreateOptions := '';
Results.Next;
end;
FreeAndNil(Results);
end;
// Stored procedures
if ServerVersionInt >= 50000 then try
Results := GetResults('SHOW PROCEDURE STATUS WHERE '+QuoteIdent('Db')+'='+EscapeString(db));
except
end;
if Assigned(Results) then begin
while not Results.Eof do begin
obj := TDBObject.Create;
Result.Add(obj);
obj.Name := Results.Col('Name');
obj.Database := db;
obj.Rows := -1;
Obj.Size := -1;
Obj.ObjType := 'PROCEDURE';
Obj.NodeType := lntProcedure;
Obj.Created := ParseDateTime(Results.Col('Created'));
Obj.Updated := ParseDateTime(Results.Col('Modified'));
Obj.Engine := '';
Obj.Comment := Results.Col('Comment');
Obj.Version := -1;
Obj.AutoInc := -1;
Obj.RowFormat := '';
Obj.AvgRowLen := -1;
Obj.MaxDataLen := -1;
Obj.IndexLen := -1;
Obj.DataLen := -1;
Obj.DataFree := -1;
Obj.LastChecked := 0;
Obj.Collation := '';
Obj.CheckSum := -1;
Obj.CreateOptions := '';
Results.Next;
end;
FreeAndNil(Results);
end;
// Triggers
if ServerVersionInt >= 50010 then try
Results := GetResults('SHOW TRIGGERS FROM '+QuoteIdent(db));
except
end;
if Assigned(Results) then begin
while not Results.Eof do begin
obj := TDBObject.Create;
Result.Add(obj);
obj.Name := Results.Col('Trigger');
obj.Database := db;
obj.Rows := -1;
Obj.Size := -1;
Obj.ObjType := 'TRIGGER';
Obj.NodeType := lntTrigger;
Obj.Created := ParseDateTime(Results.Col('Created'));
Obj.Updated := 0;
Obj.Engine := '';
Obj.Comment := Results.Col('Timing')+' '+Results.Col('Event')+' in table '+QuoteIdent(Results.Col('Table'));
Obj.Version := -1;
Obj.AutoInc := -1;
Obj.RowFormat := '';
Obj.AvgRowLen := -1;
Obj.MaxDataLen := -1;
Obj.IndexLen := -1;
Obj.DataLen := -1;
Obj.DataFree := -1;
Obj.LastChecked := 0;
Obj.Collation := '';
Obj.CheckSum := -1;
Obj.CreateOptions := '';
Results.Next;
end;
FreeAndNil(Results);
end;
// Sort list like it get sorted in MainForm.vstCompareNodes
Result.Sort;
// Add list of objects in this database to cached list of all databases
if not Assigned(FDBObjectLists) then
FDBObjectLists := TStringList.Create;
FDBObjectLists.AddObject(db, Result);
FDBSizes.Values[db] := IntToStr(DBSize);
SetObjectNamesInSelectedDB;
end;
end;
function TMySQLConnection.GetDBSize(db: String): Int64;
begin
Result := StrToInt64Def(FDBSizes.Values[db], -1);
end;
procedure TMySQLConnection.SetObjectNamesInSelectedDB;
var
i: Integer;
Objects: TDBObjectList;
ObjNames: String;
begin
// Add object names to additional stringlist
if Assigned(FObjectNamesInSelectedDB) then begin
if DbObjectsCached(FDatabase) then begin
Objects := GetDbObjects(FDatabase);
for i:=0 to Objects.Count-1 do
ObjNames := ObjNames + Objects[i].Name + CRLF;
end else
ObjNames := '';
if FObjectNamesInSelectedDB.Text <> ObjNames then
FObjectNamesInSelectedDB.Text := ObjNames;
end;
end;
{ TMySQLQuery }
constructor TMySQLQuery.Create(AOwner: TComponent);
begin
inherited Create(AOwner);
FRecNo := -1;
FRecordCount := 0;
FColumnNames := TStringList.Create;
FColumnNames.CaseSensitive := True;
FStoreResult := True;
FLogCategory := lcSQL;
end;
destructor TMySQLQuery.Destroy;
begin
FreeAndNil(FColumnNames);
if HasResult then
mysql_free_result(FLastResult);
inherited Destroy;
end;
procedure TMySQLQuery.SetSQL(Value: String);
begin
FSQL := Value;
end;
procedure TMySQLQuery.Execute;
var
i, j, NumFields: Integer;
Field: PMYSQL_FIELD;
IsBinary: Boolean;
begin
FLastResult := Connection.Query(FSQL, FStoreResult, FLogCategory);
FRecordCount := Connection.RowsFound;
if HasResult then begin
NumFields := mysql_num_fields(FLastResult);
SetLength(FDatatypes, NumFields);
SetLength(FColumnLengths, NumFields);
FColumnNames.Clear;
for i:=0 to NumFields-1 do begin
Field := mysql_fetch_field_direct(FLastResult, i);
FColumnNames.Add(Utf8ToString(Field.name));
FDatatypes[i] := Datatypes[Low(Datatypes)];
if (Field.flags and ENUM_FLAG) = ENUM_FLAG then
FDatatypes[i] := Datatypes[Integer(dtEnum)]
else if (Field.flags and SET_FLAG) = SET_FLAG then
FDatatypes[i] := Datatypes[Integer(dtSet)]
else for j:=Low(Datatypes) to High(Datatypes) do begin
if Field._type = Datatypes[j].NativeType then begin
if Datatypes[j].Index in [dtTinytext, dtText, dtMediumtext, dtLongtext] then begin
// Text and Blob types share the same constants (see FIELD_TYPEs in mysql_api)
// Some function results return binary collation up to the latest versions. Work around
// that by checking if this field is a real table field
// See http://bugs.mysql.com/bug.php?id=10201
if Connection.IsUnicode then
IsBinary := (Field.charsetnr = COLLATION_BINARY) and (Field.org_table <> '')
else
IsBinary := (Field.flags and BINARY_FLAG) = BINARY_FLAG;
if IsBinary then
continue;
end;
FDatatypes[i] := Datatypes[j];
break;
end;
end;
end;
RecNo := 0;
end else begin
SetLength(FDatatypes, 0);
SetLength(FColumnLengths, 0);
end;
end;
procedure TMySQLQuery.First;
begin
RecNo := 0;
end;
procedure TMySQLQuery.Next;
begin
RecNo := RecNo + 1;
end;
procedure TMySQLQuery.SetRecNo(Value: Int64);
var
LengthPointer: PLongInt;
i: Integer;
begin
if Value >= RecordCount then begin
FRecNo := RecordCount;
FEof := True;
end else begin
if FRecNo+1 <> Value then
mysql_data_seek(FLastResult, Value);
FRecNo := Value;
FEof := False;
FCurrentRow := mysql_fetch_row(FLastResult);
// Remember length of column contents. Important for Col() so contents of cells with #0 chars are not cut off
LengthPointer := mysql_fetch_lengths(FLastResult);
for i:=Low(FColumnLengths) to High(FColumnLengths) do
FColumnLengths[i] := PInteger(Integer(LengthPointer) + i * SizeOf(Integer))^;
end;
end;
function TMySQLQuery.ColumnCount: Integer;
begin
Result := ColumnNames.Count;
end;
function TMySQLQuery.Col(Column: Integer; IgnoreErrors: Boolean=False): String;
var
AnsiStr: AnsiString;
begin
if (Column > -1) and (Column < ColumnCount) then begin
SetString(AnsiStr, FCurrentRow[Column], FColumnLengths[Column]);
if Connection.IsUnicode then
Result := UTF8ToString(AnsiStr)
else
Result := String(AnsiStr);
end else if not IgnoreErrors then
Raise Exception.CreateFmt('Column #%d not available. Query returned %d columns and %d rows.', [Column, ColumnCount, RecordCount]);
end;
function TMySQLQuery.Col(ColumnName: String; IgnoreErrors: Boolean=False): String;
var
idx: Integer;
begin
idx := ColumnNames.IndexOf(ColumnName);
if idx > -1 then
Result := Col(idx)
else if not IgnoreErrors then
Raise Exception.CreateFmt('Column "%s" not available.', [ColumnName]);
end;
function TMySQLQuery.BinColAsHex(Column: Integer; IgnoreErrors: Boolean=False): String;
var
LengthPointer: PLongInt;
BinLen: Integer;
begin
// Return a binary column value as hex AnsiString
if (Column > -1) and (Column < ColumnCount) then begin
LengthPointer := mysql_fetch_lengths(FLastResult);
if LengthPointer <> nil then begin
BinLen := PInteger(Integer(LengthPointer) + Column * SizeOf(Integer))^;
SetLength(Result, BinLen*2);
BinToHex(FCurrentRow[Column], PChar(Result), BinLen);
end;
end else if not IgnoreErrors then
Raise Exception.CreateFmt('Column #%d not available. Query returned %d columns and %d rows.', [Column, ColumnCount, RecordCount]);
end;
function TMySQLQuery.DataType(Column: Integer): TDataType;
begin
Result := FDatatypes[Column];
end;
function TMySQLQuery.ColExists(Column: String): Boolean;
begin
Result := (ColumnNames <> nil) and (ColumnNames.IndexOf(Column) > -1);
end;
function TMySQLQuery.ColIsPrimaryKeyPart(Column: Integer): Boolean;
var
Field: PMYSQL_FIELD;
begin
if HasResult and (Column < ColumnCount) then begin
Field := mysql_fetch_field_direct(FLastResult, Column);
Result := (Field.flags and PRI_KEY_FLAG) = PRI_KEY_FLAG;
end else
Result := False;
end;
function TMySQLQuery.IsNull(Column: Integer): Boolean;
begin
Result := FCurrentRow[Column] = nil;
end;
function TMySQLQuery.IsNull(Column: String): Boolean;
begin
Result := IsNull(FColumnNames.IndexOf(Column));
end;
function TMySQLQuery.HasResult: Boolean;
begin
Result := FLastResult <> nil;
end;
{ TDBObjectComparer }
function TDBObjectComparer.Compare(const Left, Right: TDBObject): Integer;
begin
// Simple sort method for a TDBObjectList
Result := CompareText(Left.Name, Right.Name);
end;
end.
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