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HGM.SQLite.pas
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unit HGM.SQLite;
{
Simple classes for using SQLite's exec and get_table.
TSQLiteDatabase wraps the calls to open and close an SQLite database.
It also wraps SQLite_exec for queries that do not return a result set
TSQLiteTable wraps execution of SQL query.
It run query and read all returned rows to internal buffer.
It allows accessing fields by name as well as index and can move through a
result set forward and backwards, or randomly to any row.
TSQLiteUniTable wraps execution of SQL query.
It run query as TSQLiteTable, but reading just first row only!
You can step to next row (until not EOF) by 'Next' method.
You cannot step backwards! (So, it is called as UniDirectional result set.)
It not using any internal buffering, this class is very close to Sqlite API.
It allows accessing fields by name as well as index on actual row only.
Very good and fast for sequentional scanning of large result sets with minimal
memory footprint.
Warning! Do not close TSQLiteDatabase before any TSQLiteUniTable,
because query is closed on TSQLiteUniTable destructor and database connection
is used during TSQLiteUniTable live!
SQL parameter usage:
You can add named parameter values by call set of AddParam* methods.
Parameters will be used for first next SQL statement only.
Parameter name must be prefixed by ':', '$' or '@' and same prefix must be
used in SQL statement!
Sample:
table.AddParamText(':str', 'some value');
s := table.GetTableString('SELECT value FROM sometable WHERE id=:str');
Notes from Andrew Retmanski on prepared queries
The changes are as follows:
SQLiteTable3.pas
- Added new boolean property Synchronised (this controls the SYNCHRONOUS pragma as I found that turning this OFF increased the write performance in my application)
- Added new type TSQLiteQuery (this is just a simple record wrapper around the SQL string and a TSQLiteStmt pointer)
- Added PrepareSQL method to prepare SQL query - returns TSQLiteQuery
- Added ReleaseSQL method to release previously prepared query
- Added overloaded BindSQL methods for Integer and String types - these set new values for the prepared query parameters
- Added overloaded ExecSQL method to execute a prepared TSQLiteQuery
Usage of the new methods should be self explanatory but the process is in essence:
1. Call PrepareSQL to return TSQLiteQuery 2. Call BindSQL for each parameter in the prepared query 3. Call ExecSQL to run the prepared query 4. Repeat steps 2 & 3 as required 5. Call ReleaseSQL to free SQLite resources
One other point - the Synchronised property throws an error if used inside a transaction.
Acknowledments
Adapted by Tim Anderson ([email protected])
Originally created by Pablo Pissanetzky ([email protected])
Modified and enhanced by Lukas Gebauer
Modified and enhanced by Tobias Gunkel
Âíåñåíû èçìåíåíèÿ 04.05.2017 HemulGM
1. Îáðàáîòàíû íîâûå èñêëþ÷åíèÿ
2. Ââåäåíû íîâûå òèïû èñêëþ÷åíèé
3. Èñïðàâëåíû îøèáêè ôîðìàòèðîâíèÿ è íàâåä¸í êîñìåòè÷åñêèé ïîðÿäîê
Âíåñåíû èçìåíåíèÿ 26.10.2020 HemulGM
1. Global refactoring
2. Ðàñøèðåí êëàññ áàçû äàííûõ
3. Îòëîæåííàÿ èíèöèàëèçàöèÿ
4. Èíèöèàëèçàöèÿ íóæíîé áèáëèîòåêè
5. Ðàáîòà ñ PRAGMA key (sqlite3ex.dll)
6. Fix unicode binds
7. Èçìíåí¸í ñïèñîê ïàðàìåòðîâ
8. Ñîçäàíèå ôóíêöèé
}
{$UNDEF UNICODE}
interface
uses
{$IFDEF WIN32}
Winapi.Windows,
{$ENDIF}
HGM.SQLite.Wrapper, System.Classes, System.SysUtils,
System.Generics.Collections;
const
ERROR_EOF = 'Table is at End of File';
type
ESQLiteException = class(Exception);
ESQLiteBlob = class(ESQLiteException);
ESQLiteOpen = class(ESQLiteException);
ESQLiteQueryError = class(ESQLiteException);
ESQLiteUnknown = class(ESQLiteException);
ESQLiteUnknownStringType = class(ESQLiteException);
ESQLiteUnhandledPointer = class(ESQLiteException);
ESQLiteUnhandledObjectType = class(ESQLiteException);
ESQLiteUnhandledBinding = class(ESQLiteException);
ESQLiteTransaction = class(ESQLiteException);
ESQLiteInitializeBackup = class(ESQLiteException);
ESQLiteIsBusy = class(ESQLiteException);
ESQLiteFieldNotFound = class(ESQLiteException);
ESQLiteTableEOF = class(ESQLiteException);
ESQLiteTypeError = class(ESQLiteException);
//
TSQLiteDatabase = class;
TSQLiteTable = class;
TSQLiteUniTable = class;
TSQLiteSynchronous = (ssOFF, ssNORMAL, ssFULL, ssEXTRA);
TSQLiteSynchronousHelper = record helper for TSQLiteSynchronous
function ToString: string; inline;
end;
THookQuery = procedure(Sender: TObject; SQL: string) of object;
TSQLErrorHandle = procedure(Sender: TSQLiteDatabase; ErrorCode: Integer; Msg: string; var Handle: Boolean) of object;
TSQLiteParam = class
public
Name: string;
ValueType: Integer;
ValueInteger: Int64;
ValueFloat: Double;
ValueData: string;
end;
TSQLiteParams = class(TObjectList<TSQLiteParam>)
procedure Add(Name: string); overload;
procedure Add(Name: string; Value: Double); overload;
procedure Add(Name: string; Value: Int64); overload;
procedure Add(Name: string; Value: string); overload;
end;
TSQLiteQuery = record
SQL: string;
Statement: TSQLiteStmt;
end;
TSQLiteDatabase = class
private
class var
FIsInit: Boolean;
private
FDBInstance: TSQLiteDB;
FInTrans: Boolean;
FOnQuery: THookQuery;
FParams: TSQLiteParams;
FSync: TSQLiteSynchronous;
FSQLErrorHandle: TSQLErrorHandle;
FSecretKey: string;
FTimeout: Integer;
function GetRowsChanged: Integer;
function GetTotalChanges: Int64;
function GetLastInsertRowID: Int64;
procedure SetSecretKey(const Value: string);
procedure BindData(Stmt: TSQLiteStmt; const Bindings: array of const);
procedure RaiseError(s: string; SQL: string);
procedure SetParams(Stmt: TSQLiteStmt);
procedure SetSynchronised(Value: TSQLiteSynchronous);
procedure SetTimeout(Value: Integer);
protected
procedure DoQuery(Value: string);
public
class procedure LoadSqliteLib(SQLiteLib: string = ''); static;
//
function Backup(TargetDB: TSQLiteDatabase): Integer; overload;
function Backup(TargetDB: TSQLiteDatabase; TargetName: string; SourceName: string): Integer; overload;
function Backup(TargetDB: string): Integer; overload;
function Backup(TargetDB: string; TargetName: string; SourceName: string): Integer; overload;
//
/// <summary>
/// Ñòðîêè áàçû äàííûõ, êîòîðûå áûëè èçìåíåíû (èëè âñòàâëåíû, èëè óäàëåíû) ïîñëåäíèì îïåðàòîðîì SQL
/// </summary>
property RowsChanged: Integer read GetRowsChanged;
/// <summary>
/// Ñòðîêè áàçû äàííûõ, êîòîðûå áûëè èçìåíåíû (èëè âñòàâëåíû, èëè óäàëåíû) ïîñëåäíèì îïåðàòîðîì SQL ñ ìîìåíòà ñîçäàíèÿ ïîäêëþ÷åíèÿ
/// </summary>
property TotalChanges: Int64 read GetTotalChanges;
/// <summary>
/// ROWID ïîñëåäíåé âñòàâëåííîé ñòðîêè
/// </summary>
property LastInsertRowID: Int64 read GetLastInsertRowID;
//
function GetTable(const SQL: string): TSQLiteTable; overload; deprecated 'Use Query or GetUniTable';
function GetTable(const SQL: string; const Bindings: array of const): TSQLiteTable; overload; deprecated 'Use Query or GetUniTable';
function Query(const SQL: string): TSQLiteTable; overload;
function Query(const SQL: string; const Bindings: array of const): TSQLiteTable; overload;
function GetTableValue(const SQL: string): Int64; overload;
function GetTableValue(const SQL: string; const Bindings: array of const): Int64; overload;
function GetRowValues(const SQL: string): TArray<Variant>; overload;
function GetRowValues(const SQL: string; const Bindings: array of const): TArray<Variant>; overload;
function GetUniTable(const SQL: string): TSQLiteUniTable; overload;
function GetUniTable(const SQL: string; const Bindings: array of const): TSQLiteUniTable; overload;
function GetTableString(const SQL: string): string; overload;
function GetTableString(const SQL: string; const Bindings: array of const): string; overload;
function GetSQLofTable(const TableName: string; DataBase: string = ''): string;
function GetTableStrings(const SQL: string; const Value: TStrings): Boolean; overload;
function GetTableStrings(const SQL: string; const Value: TStrings; FieldNum: Integer; const Bindings: array of const): Boolean; overload;
//
procedure ExecSQL(const SQL: string); overload;
procedure ExecSQL(const SQL: string; const Bindings: array of const); overload;
procedure ExecSQL(Query: TSQLiteQuery); overload;
procedure UpdateBlob(const SQL: string; BlobData: TStream);
//
function PrepareSQL(const SQL: string): TSQLiteQuery;
procedure ReleaseSQL(Query: TSQLiteQuery);
//
procedure AttachDatabase(const FileName, Alias: string);
procedure DetachDatabase(const Alias: string);
procedure CreateFunction(const FuncName: string; Addr: TxFunc; ArgCount: Integer = 1);
function TableExists(TableName: string): Boolean;
function Version: string;
//
procedure BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: Integer); overload;
procedure BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: string); overload;
//
/// <summary>
/// Äîáàâëÿåò ñîïîñòàâëåíèå ñ èìåíåì SYSTEM äëÿ ïðàâèëüíîé ñîðòèðîâêè äàííûõ ïî ÿçûêó ïîëüçîâàòåëÿ
/// </summary>
procedure AddSystemCollate;
/// <summary>
/// Äîáàâëÿåò ñîïîñòàâëåíèå ñ èìåíåì SYSTEM äëÿ ïðàâèëüíîé ñîðòèðîâêè äàííûõ ïî ÿçûêó ïîëüçîâàòåëÿ
/// </summary>
procedure AddCustomCollate(Name: string; Compare: TCollateCompare);
//
procedure BeginTransaction;
procedure Commit;
procedure Rollback;
property IsTransactionOpen: Boolean read FInTrans;
//
constructor Create(const FileName: string = ':memory:'); overload; virtual;
destructor Destroy; override;
//props
property Instance: TSQLiteDB read FDBInstance;
//
property OnQuery: THookQuery read FOnQuery write FOnQuery;
property ErrorHandler: TSQLErrorHandle read FSQLErrorHandle write FSQLErrorHandle;
property Synchronous: TSQLiteSynchronous read FSync write SetSynchronised;
/// <summary>
/// Ïåðåäàòü ïàðîëü äëÿ äåøèôðîâêè. Ìîæíî èñïîëüçîâàòü òîëüêî ïîñëå ñîçäàíèÿ ÁÄ
/// </summary>
/// <param name="Phrase: string">Ïàðîëü</param>
/// <param name="DoXOR: Boolean = True (íå îáÿçàòåëüíûé)">Èñïîëüçóÿ SecretKey ñäåëàòü XOR ïàðîëÿ</param>
procedure Password(Phrase: string; DoXOR: Boolean = True);
/// <summary>
/// Èçìåíèòü ïàðîëü äëÿ äåøèôðîâêè
/// </summary>
/// <param name="NewPhrase - System.string">Íîâûé ïàðîëü</param>
/// <param name="DoXOR - System.Boolean = True (íå îáÿçàòåëüíûé)">Èñïîëüçóÿ SecretKey ñäåëàòü XOR ïàðîëÿ</param>
procedure ChangePassword(Phrase: string; DoXOR: Boolean = True);
/// <summary>
/// Ñåêðåòíàÿ ñòðîêà, êîòîðàÿ ó÷àñòâóåò â XOR ïðåîáðàçîâàíèè ïàðîëÿ
/// </summary>
property SecretKey: string read FSecretKey write SetSecretKey;
//
property Timeout: Integer read FTimeout write SetTimeout;
/// <summary>
///
/// </summary>
property Params: TSQLiteParams read FParams;
end;
TSQLiteTable = class
private
FColCount: Cardinal;
FCols: TStringList;
FColTypes: TList<Integer>;
FResults: TList;
FRow: Cardinal;
FRowCount: Cardinal;
function GetBOF: Boolean;
function GetColumns(i: integer): string;
function GetCount: Integer;
function GetCountResult: Integer;
function GetEOF: Boolean;
function GetFieldByName(FieldName: string): string;
function GetFieldIndex(FieldName: string): Integer;
function GetFields(i: Cardinal): string;
public
function ToArray: TArray<TArray<string>>;
function FieldsToArray: TArray<string>;
function FieldAsBlob(i: Cardinal): TMemoryStream; overload;
function FieldAsBlobText(i: Cardinal): string; overload;
function FieldAsDouble(i: Cardinal): Double; overload;
function FieldAsDateTime(i: Cardinal): TDateTime; overload;
function FieldAsInteger(i: Cardinal): Int64; overload;
function FieldAsBoolean(i: Cardinal): Boolean; overload;
function FieldAsString(i: Cardinal): string; overload;
function FieldIsNull(i: Cardinal): Boolean; overload;
function FieldAsBlob(FieldName: string): TMemoryStream; overload;
function FieldAsBlobText(FieldName: string): string; overload;
function FieldAsDouble(FieldName: string): Double; overload;
function FieldAsDateTime(FieldName: string): TDateTime; overload;
function FieldAsInteger(FieldName: string): Int64; overload;
function FieldAsBoolean(FieldName: string): Boolean; overload;
function FieldAsString(FieldName: string): string; overload;
function FieldIsNull(FieldName: string): Boolean; overload;
function FieldType(FieldName: string): Integer; overload;
function FieldType(i: Integer): Integer; overload;
function MoveFirst: Boolean;
function MoveLast: Boolean;
function MoveTo(Position: Cardinal): Boolean;
function Next: Boolean;
function Previous: Boolean;
property BoF: Boolean read GetBOF;
property ColCount: Cardinal read FColCount;
property Columns[i: Integer]: string read GetColumns;
property Count: Integer read GetCount;
// The property CountResult is used when you execute count(*) queries.
// It returns 0 if the result set is empty or the value of the
// first field as an integer.
property CountResult: Integer read GetCountResult;
property EoF: Boolean read GetEOF;
property FieldByName[FieldName: string]: string read GetFieldByName;
property FieldIndex[FieldName: string]: integer read GetFieldIndex;
property Fields[i: Cardinal]: string read GetFields;
property Row: Cardinal read FRow;
property RowCount: Cardinal read FRowCount;
constructor Create(DB: TSQLiteDatabase; const SQL: string); overload;
constructor Create(DB: TSQLiteDatabase; const SQL: string; const Bindings: array of const); overload;
destructor Destroy; override;
end;
TSQLiteUniTable = class
private
FColCount: Cardinal;
FCols: TStringList;
FDB: TSQLiteDatabase;
FEoF: Boolean;
FRow: Cardinal;
FSQL: string;
FStmt: TSQLiteStmt;
function GetColumns(i: Integer): string;
function GetFieldByName(FieldName: string): string;
function GetFieldIndex(FieldName: string): Integer;
function GetFields(i: Cardinal): string;
public
function FieldAsBlob(i: Cardinal): TMemoryStream; overload;
function FieldAsBlobPtr(i: Cardinal; out iNumBytes: integer): Pointer; overload;
function FieldAsBlobText(i: Cardinal): string; overload;
function FieldAsDouble(i: Cardinal): Double; overload;
function FieldAsInteger(i: Cardinal): Int64; overload;
function FieldAsString(i: Cardinal): string; overload;
function FieldIsNull(i: Cardinal): Boolean; overload;
function FieldAsDateTime(i: Cardinal): TDateTime; overload;
function FieldAsBoolean(i: Cardinal): Boolean; overload;
function FieldAsBlob(FieldName: string): TMemoryStream; overload;
function FieldAsBlobText(FieldName: string): string; overload;
function FieldAsDouble(FieldName: string): Double; overload;
function FieldAsInteger(FieldName: string): Int64; overload;
function FieldAsString(FieldName: string): string; overload;
function FieldIsNull(FieldName: string): Boolean; overload;
function FieldAsDateTime(FieldName: string): TDateTime; overload;
function FieldAsBoolean(FieldName: string): Boolean; overload;
function FieldType(FieldName: string): Integer; overload;
function FieldType(i: Integer): Integer; overload;
function Next: Boolean;
property ColCount: Cardinal read FColCount;
property Columns[i: Integer]: string read GetColumns;
property EoF: Boolean read FEoF;
property FieldByName[FieldName: string]: string read GetFieldByName;
property FieldIndex[FieldName: string]: Integer read GetFieldIndex;
property Fields[i: Cardinal]: string read GetFields;
property Row: Cardinal read FRow;
constructor Create(DB: TSQLiteDatabase; const SQL: string); overload;
constructor Create(DB: TSQLiteDatabase; const SQL: string; const Bindings: array of const); overload;
destructor Destroy; override;
end;
function SQLiteErrorStr(SQLiteErrorCode: Integer): string;
function SQLiteFieldType(SQLiteFieldTypeCode: Integer): string;
procedure DisposePointer(ptr: pointer); cdecl;
procedure SQLiteUpper(Context: Pointer; Arg: Integer; Args: PPointerArray); cdecl;
procedure SQLiteLower(Context: Pointer; Arg: Integer; Args: PPointerArray); cdecl;
procedure SQLiteContains(Context: Pointer; Arg: Integer; Args: PPointerArray); cdecl;
function SystemCollate(Userdta: pointer; Buf1Len: integer; Buf1: pointer; Buf2Len: integer; Buf2: pointer): integer; cdecl;
implementation
uses
System.Variants;
{$WARNINGS OFF}
function XORString(Text, Key: string; Offset: Integer = 0): string;
var
i: Integer;
begin
Result := '';
if (Key = '') or (Text = '') then
Exit;
while Length(Key) < Length(Text) do
Key := Key + Key;
for i := 1 to Length(Text) do
Result := Result + AnsiChar(Ord(Text[i]) xor not (Ord(Key[i mod Length(Key) + 1])));
end;
{$WARNINGS ON}
function SQLiteErrorStr(SQLiteErrorCode: Integer): string;
begin
case SQLiteErrorCode of
SQLITE_OK:
Result := 'Óñïåøíûé ðåçóëüòàò';
SQLITE_ERROR:
Result := 'Îøèáêà SQL èëè îòñóòñòâóåò áàçà äàííûõ';
SQLITE_INTERNAL:
Result := 'Âíóòðåííÿÿ ëîãè÷åñêàÿ îøèáêà SQLite';
SQLITE_PERM:
Result := 'Îòêàçàíî â äîñòóïå';
SQLITE_ABORT:
Result := 'Ïðîöåäóðà îáðàòíîãî âûçîâà çàïðîñèëà îòìåíó';
SQLITE_BUSY:
Result := 'Ôàéë áàçû äàííûõ çàáëîêèðîâàí';
SQLITE_LOCKED:
Result := 'Òàáëèöà â áàçå äàííûõ çàáëîêèðîâàíà';
SQLITE_NOMEM:
Result := 'Îøèáêà malloc()';
SQLITE_READONLY:
Result := 'Ïîïûòêà çàïèñè â áàçó äàííûõ òîëüêî äëÿ ÷òåíèÿ';
SQLITE_INTERRUPT:
Result := 'Îïåðàöèÿ çàâåðøåíà sqlite3_interrupt()';
SQLITE_IOERR:
Result := 'Ïðîèçîøëà îøèáêà äèñêîâîãî ââîäà-âûâîäà';
SQLITE_CORRUPT:
Result := 'Îáðàç äèñêà áàçû äàííûõ èìååò íåâåðíûé ôîðìàò';
SQLITE_NOTFOUND:
Result := '(Òîëüêî äëÿ âíóòðåííåãî èñïîëüçîâàíèÿ) Òàáëèöà èëè çàïèñü íå íàéäåíû';
SQLITE_FULL:
Result := 'Îøèáêà ïðè âñòàâêå, ïîñêîëüêó áàçà äàííûõ çàïîëíåíà';
SQLITE_CANTOPEN:
Result := 'Íå óäàëîñü îòêðûòü ôàéë áàçû äàííûõ';
SQLITE_PROTOCOL:
Result := 'Îøèáêà ïðîòîêîëà áàçû äàííûõ';
SQLITE_EMPTY:
Result := 'Áàçà äàííûõ ïóñòà';
SQLITE_SCHEMA:
Result := 'Ñõåìà áàçû äàííûõ èçìåíåíà';
SQLITE_TOOBIG:
Result := 'Ñëèøêîì ìíîãî äàííûõ äëÿ îäíîé ñòðîêè òàáëèöû';
SQLITE_CONSTRAINT:
Result := 'Ïðåðâàíî èç-çà íàðóøåíèÿ îãðàíè÷åíèÿ';
SQLITE_MISMATCH:
Result := 'Íåñîâïàäåíèå òèïà äàííûõ';
SQLITE_MISUSE:
Result := 'Áèáëèîòåêà èñïîëüçóåòñÿ íåïðàâèëüíî';
SQLITE_NOLFS:
Result := 'Èñïîëüçóåò ôóíêöèè ÎÑ, íå ïîääåðæèâàåìûå íà õîñòå';
SQLITE_AUTH:
Result := 'Àâòîðèçàöèÿ çàïðåùåíà';
SQLITE_FORMAT:
Result := 'Îøèáêà ôîðìàòèðîâàíèÿ âñïîìîãàòåëüíîé áàçû äàííûõ';
SQLITE_RANGE:
Result := 'Âòîðîé ïàðàìåòð äëÿ sqlite3_bind âíå äèàïàçîíà';
SQLITE_NOTADB:
Result := 'Îòêðûò ôàéë, êîòîðûé íå ÿâëÿåòñÿ ôàéëîì áàçû äàííûõ';
SQLITE_ROW:
Result := 'Sqlite3_step() èìååò åùå îäíó ñòðîêó';
SQLITE_DONE:
Result := 'Âûïîëíåíèå sqlite3_step() çàâåðøåíî';
else
Result := 'Íåèçâåñòíûé êîä îøèáêè SQLite "' + IntToStr(SQLiteErrorCode) + '"';
end;
end;
function SQLiteFieldType(SQLiteFieldTypeCode: Integer): string;
begin
case SQLiteFieldTypeCode of
SQLITE_INTEGER:
Result := 'Integer';
SQLITE_FLOAT:
Result := 'Float';
SQLITE_TEXT:
Result := 'Text';
SQLITE_BLOB:
Result := 'Blob';
SQLITE_NULL:
Result := 'Null';
else
Result := 'TYPE(' + SQLiteFieldTypeCode.ToString + ')';
end;
end;
procedure SQLiteContains(Context: Pointer; Arg: Integer; Args: PPointerArray);
var
S1, S2: string;
Result: Integer;
begin
S1 := AnsiUpperCase(string(SQLite3_Value_Text(Args[0])));
S2 := AnsiUpperCase(string(SQLite3_Value_Text(Args[1])));
Result := Ord(Pos(S2, S1) <> 0);
SQLite3_Result_Int(Context, Result);
end;
procedure SQLiteUpper(Context: Pointer; Arg: Integer; Args: PPointerArray);
var
S: string;
begin
S := string(SQLite3_Value_Text(Args[0]));
S := AnsiUpperCase(S);
SQLite3_Result_Text(Context, PAnsiChar(AnsiString(S)), S.Length, nil);
end;
procedure SQLiteLower(Context: Pointer; Arg: Integer; Args: PPointerArray);
var
S: string;
begin
S := string(SQLite3_Value_Text(Args[0]));
S := AnsiLowerCase(S);
SQLite3_Result_Text(Context, PAnsiChar(AnsiString(S)), S.Length, nil);
end;
procedure DisposePointer(ptr: Pointer); cdecl;
begin
if Assigned(ptr) then
FreeMem(ptr);
end;
function SystemCollate(Userdta: pointer; Buf1Len: integer; Buf1: pointer; Buf2Len: integer; Buf2: pointer): integer; cdecl;
begin
Result := CompareStringW(LOCALE_USER_DEFAULT, 0, PWideChar(Buf1), Buf1Len, PWideChar(Buf2), Buf2Len) - 2;
end;
{ TSQLiteDatabase }
procedure TSQLiteDatabase.Password(Phrase: string; DoXOR: Boolean);
begin
if DoXOR then
ExecSQL('PRAGMA key = "' + XORString(Phrase, FSecretKey) + '"')
else
ExecSQL('PRAGMA key = "' + Phrase + '"');
end;
procedure TSQLiteDatabase.ChangePassword(Phrase: string; DoXOR: Boolean);
begin
if DoXOR then
ExecSQL('PRAGMA key = "' + XORString(Phrase, FSecretKey) + '"')
else
ExecSQL('PRAGMA key = "' + Phrase + '"');
end;
procedure TSQLiteDatabase.SetSecretKey(const Value: string);
begin
FSecretKey := Value;
end;
class procedure TSQLiteDatabase.LoadSqliteLib(SQLiteLib: string);
begin
if not FIsInit then
begin
InitSQL(SQLiteLib);
FIsInit := True;
end;
end;
constructor TSQLiteDatabase.Create(const FileName: string);
var
Msg: PAnsiChar;
begin
LoadSqliteLib;
inherited Create;
FSecretKey := 'D6AFC382FE1JGHDF557496789A56EDDE25AF244AE30D4EDA268CC12AC9E4B92F8';
FParams := TSQLiteParams.Create;
Self.FInTrans := False;
Msg := nil;
try
if SQLite3_Open(PAnsiChar(AnsiString(FileName)), FDBInstance) <> SQLITE_OK then
begin
if Assigned(FDBInstance) then
begin
Msg := Sqlite3_ErrMsg(FDBInstance);
raise ESQLiteOpen.CreateFmt('Failed to open database "%s" : %s', [FileName, Msg]);
end
else
raise ESQLiteOpen.CreateFmt('Failed to open database "%s" : unknown error', [FileName]);
end;
//set a few configs
//L.G. Do not call it here. Because busy handler is not setted here,
// any share violation causing exception!
// self.ExecSQL('PRAGMA SYNCHRONOUS=NORMAL;');
// self.ExecSQL('PRAGMA temp_store = MEMORY;');
finally
if Assigned(Msg) then
SQLite3_Free(Msg);
end;
end;
procedure TSQLiteDatabase.CreateFunction(const FuncName: string; Addr: TxFunc; ArgCount: Integer);
begin
SQLite3_Create_Function(Instance, PWideChar(FuncName), ArgCount, SQLITE_ANY, nil, Addr, nil, nil);
end;
destructor TSQLiteDatabase.Destroy;
begin
if FInTrans then
Rollback;
if Assigned(FDBInstance) then
SQLite3_Close(FDBInstance);
FParams.Free;
inherited;
end;
function TSQLiteDatabase.GetLastInsertRowID: Int64;
begin
Result := Sqlite3_LastInsertRowID(FDBInstance);
end;
function TSQLiteDatabase.GetTotalChanges: Int64;
begin
Result := SQLite3_TotalChanges(FDBInstance);
end;
procedure TSQLiteDatabase.RaiseError(s: string; SQL: string);
var
Msg: string;
ErrCode: Integer;
Handled: Boolean;
begin
ErrCode := SQLite3_ErrCode(FDBInstance);
Msg := string(SQLite3_ErrMsg(FDBInstance));
if Assigned(FSQLErrorHandle) then
begin
FSQLErrorHandle(Self, ErrCode, Msg, Handled);
if Handled then
Exit;
end;
if ErrCode <> SQLITE_OK then
begin
case ErrCode of
SQLITE_NOTADB:
raise ESQLiteOpen.CreateFmt('Failed to open database: %s ', [Msg]);
SQLITE_ERROR:
raise ESQLiteQueryError.CreateFmt('SQL error or missing database: %s', [Msg]);
SQLITE_BUSY:
raise ESQLiteIsBusy.Create('Database is locked');
end;
end;
if Msg <> '' then
raise ESQLiteUnknown.CreateFmt(s + '.'#13'Error [%d]: %s.'#13'"%s": %s', [ErrCode, SQLiteErrorStr(ErrCode), SQL, Msg])
else
raise ESQLiteUnknown.CreateFmt(s, [SQL, 'No message']);
end;
procedure TSQLiteDatabase.SetSynchronised(Value: TSQLiteSynchronous);
begin
if Value <> FSync then
begin
ExecSQL(' PRAGMA synchronous = "' + Value.ToString + '"');
FSync := Value;
end;
end;
procedure TSQLiteDatabase.BindData(Stmt: TSQLiteStmt; const Bindings: array of const);
var
BlobMemStream: TCustomMemoryStream;
BlobStdStream: TStream;
DataPtr: Pointer;
DataSize: Integer;
AnsiStr: AnsiString;
AnsiStrPtr: PAnsiString;
I: Integer;
begin
for I := Low(Bindings) to High(Bindings) do
begin
case Bindings[I].VType of
vtString, vtAnsiString, vtPChar, vtWideString, vtPWideChar, vtChar, vtWideChar, vtUnicodeString:
begin
case Bindings[I].VType of
vtString:
begin // ShortString
AnsiStr := Bindings[I].VString^;
DataPtr := PAnsiChar(AnsiStr);
DataSize := Length(AnsiStr) + 1;
end;
vtUnicodeString:
begin
DataPtr := PAnsiChar(UTF8Encode(string(@Bindings[I].VUnicodeString^)));
DataSize := -1;
end;
vtPChar:
begin
DataPtr := Bindings[I].VPChar;
DataSize := -1;
end;
vtAnsiString:
begin
AnsiStrPtr := PAnsiString(@Bindings[I].VAnsiString);
DataPtr := PAnsiChar(AnsiStrPtr^);
DataSize := Length(AnsiStrPtr^) + 1;
end;
vtPWideChar:
begin
DataPtr := PAnsiChar(UTF8Encode(WideString(Bindings[I].VPWideChar)));
DataSize := -1;
end;
vtWideString:
begin
DataPtr := PAnsiChar(UTF8Encode(PWideString(@Bindings[I].VWideString)^));
DataSize := -1;
end;
vtChar:
begin
DataPtr := PAnsiChar(AnsiString(Bindings[I].VChar)); //string typecast
DataSize := 2;
end;
vtWideChar:
begin
DataPtr := PAnsiChar(UTF8Encode(WideString(Bindings[I].VWideChar)));
DataSize := -1;
end;
else
raise ESQLiteUnknownStringType.Create('Unknown string-type');
end;
if sqlite3_bind_text(Stmt, I + 1, DataPtr, DataSize, SQLITE_STATIC) <> SQLITE_OK then
RaiseError('Could not bind text', 'BindData');
end;
vtInteger:
if sqlite3_bind_int(Stmt, I + 1, Bindings[I].VInteger) <> SQLITE_OK then
RaiseError('Could not bind integer', 'BindData');
vtInt64:
if sqlite3_bind_int64(Stmt, I + 1, Bindings[I].VInt64^) <> SQLITE_OK then
RaiseError('Could not bind int64', 'BindData');
vtExtended:
if sqlite3_bind_double(Stmt, I + 1, Bindings[I].VExtended^) <> SQLITE_OK then
RaiseError('Could not bind extended', 'BindData');
vtBoolean:
if sqlite3_bind_int(Stmt, I + 1, Integer(Bindings[I].VBoolean)) <> SQLITE_OK then
RaiseError('Could not bind boolean', 'BindData');
vtPointer:
begin
if (Bindings[I].VPointer = nil) then
begin
if sqlite3_bind_null(Stmt, I + 1) <> SQLITE_OK then
RaiseError('Could not bind null', 'BindData');
end
else
raise ESQLiteUnhandledPointer.Create('Unhandled pointer (<> nil)');
end;
vtObject:
begin
if (Bindings[I].VObject is TCustomMemoryStream) then
begin
BlobMemStream := TCustomMemoryStream(Bindings[I].VObject);
if (sqlite3_bind_blob(Stmt, I + 1, @PAnsiChar(BlobMemStream.Memory)[BlobMemStream.Position], BlobMemStream.Size
- BlobMemStream.Position, SQLITE_STATIC) <> SQLITE_OK) then
RaiseError('Could not bind BLOB', 'BindData');
end
else if (Bindings[I].VObject is TStream) then
begin
BlobStdStream := TStream(Bindings[I].VObject);
DataSize := BlobStdStream.Size;
GetMem(DataPtr, DataSize);
if (DataPtr = nil) then
raise ESQLiteBlob.Create('Error getting memory to save BLOB');
BlobStdStream.Position := 0;
BlobStdStream.Read(DataPtr^, DataSize);
if (sqlite3_bind_blob(Stmt, I + 1, DataPtr, DataSize, @DisposePointer) <> SQLITE_OK) then
RaiseError('Could not bind BLOB', 'BindData');
end
else
raise ESQLiteUnhandledObjectType.Create('Unhandled object-type in binding');
end
else
begin
raise ESQLiteUnhandledBinding.Create('Unhandled binding');
end;
end;
end;
end;
procedure TSQLiteDatabase.ExecSQL(const SQL: string);
begin
ExecSQL(SQL, []);
end;
procedure TSQLiteDatabase.ExecSQL(const SQL: string; const Bindings: array of const);
var
Stmt: TSQLiteStmt;
NextSQLStatement: PAnsiChar;
iStepResult: Integer;
begin
try
if Sqlite3_Prepare_v2(FDBInstance, PAnsiChar(AnsiString(SQL)), -1, Stmt, NextSQLStatement) <> SQLITE_OK then
RaiseError('Error executing SQL', SQL);
if Stmt = nil then
RaiseError('Could not prepare SQL statement', SQL);
DoQuery(SQL);
SetParams(Stmt);
BindData(Stmt, Bindings);
iStepResult := Sqlite3_step(Stmt);
if (iStepResult <> SQLITE_DONE) then
begin
SQLite3_reset(Stmt);
RaiseError('Error executing SQL statement', SQL);
end;
finally
if Assigned(Stmt) then
Sqlite3_Finalize(Stmt);
end;
end;
procedure TSQLiteDatabase.ExecSQL(Query: TSQLiteQuery);
var
iStepResult: integer;
begin
if Assigned(Query.Statement) then
begin
iStepResult := Sqlite3_step(Query.Statement);
if (iStepResult <> SQLITE_DONE) then
begin
SQLite3_reset(Query.Statement);
RaiseError('Error executing prepared SQL statement', Query.SQL);
end;
Sqlite3_Reset(Query.Statement);
end;
end;
function TSQLiteDatabase.PrepareSQL(const SQL: string): TSQLiteQuery;
var
Stmt: TSQLiteStmt;
NextSQLStatement: PAnsiChar;
begin
Result.SQL := SQL;
Result.Statement := nil;
if Sqlite3_Prepare(FDBInstance, PAnsiChar(AnsiString(SQL)), -1, Stmt, NextSQLStatement) <> SQLITE_OK then
RaiseError('Error executing SQL', SQL)
else
Result.Statement := Stmt;
if (Result.Statement = nil) then
RaiseError('Could not prepare SQL statement', SQL);
DoQuery(SQL);
end;
procedure TSQLiteDatabase.BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: Integer);
begin
if Assigned(Query.Statement) then
SQLite3_Bind_Int(Query.Statement, Index, Value)
else
RaiseError('Could not bind integer to prepared SQL statement', Query.SQL);
end;
procedure TSQLiteDatabase.BindSQL(Query: TSQLiteQuery; const Index: Integer; const Value: string);
begin
if Assigned(Query.Statement) then
SQLite3_Bind_Text(Query.Statement, Index, PAnsiChar(AnsiString(Value)), Length(Value), Pointer(SQLITE_STATIC))
else
RaiseError('Could not bind string to prepared SQL statement', Query.SQL);
end;
procedure TSQLiteDatabase.ReleaseSQL(Query: TSQLiteQuery);
begin
if Assigned(Query.Statement) then
begin
SQLite3_Finalize(Query.Statement);
Query.Statement := nil;
end
else
RaiseError('Could not release prepared SQL statement', Query.SQL);
end;
procedure TSQLiteDatabase.UpdateBlob(const SQL: string; BlobData: TStream);
var
iSize: integer;
ptr: pointer;
Stmt: TSQLiteStmt;
NextSQLStatement: PAnsiChar;
begin
//expects SQL of the form 'UPDATE MYTABLE SET MYFIELD = ? WHERE MYKEY = 1'
if Pos('?', SQL) = 0 then
RaiseError('SQL must include a "?" parameter', SQL);
try
if Sqlite3_Prepare_v2(FDBInstance, PAnsiChar(AnsiString(SQL)), -1, Stmt, NextSQLStatement) <> SQLITE_OK then
RaiseError('Could not prepare SQL statement', SQL);
if Stmt = nil then
RaiseError('Could not prepare SQL statement', SQL);
DoQuery(SQL);
//now bind the blob data
iSize := BlobData.size;
GetMem(ptr, iSize);
if ptr = nil then
raise ESQLiteBlob.CreateFmt('Error getting memory to save BLOB', [SQL, 'Error']);
BlobData.Position := 0;
BlobData.Read(ptr^, iSize);
if SQLite3_Bind_Blob(Stmt, 1, ptr, iSize, @DisposePointer) <> SQLITE_OK then
RaiseError('Error binding blob to database', SQL);
if SQLite3_Step(Stmt) <> SQLITE_DONE then
begin
SQLite3_reset(Stmt);
RaiseError('Error executing SQL statement', SQL);
end;
finally
begin
if Assigned(Stmt) then
SQLite3_Finalize(Stmt);
end;
end;
end;
function TSQLiteDatabase.Query(const SQL: string): TSQLiteTable;
begin
Result := TSQLiteTable.Create(Self, SQL);
end;
function TSQLiteDatabase.Query(const SQL: string; const Bindings: array of const): TSQLiteTable;
begin
Result := TSQLiteTable.Create(Self, SQL, Bindings);
end;
function TSQLiteDatabase.GetUniTable(const SQL: string): TSQLiteUniTable;
begin
Result := TSQLiteUniTable.Create(Self, SQL);
end;
function TSQLiteDatabase.GetUniTable(const SQL: string; const Bindings: array of const): TSQLiteUniTable;
begin
Result := TSQLiteUniTable.Create(Self, SQL, Bindings);
end;
function TSQLiteDatabase.GetTableValue(const SQL: string): int64;
begin
Result := GetTableValue(SQL, []);
end;
function TSQLiteDatabase.GetTableValue(const SQL: string; const Bindings: array of const): int64;
var
Table: TSQLiteTable;
begin
Result := -1;
Table := Query(SQL, Bindings);
try
if not Table.EoF then
Result := Table.FieldAsInteger(0);
finally
Table.Free;
end;
end;
function TSQLiteDatabase.GetRowValues(const SQL: string; const Bindings: array of const): TArray<Variant>;
var
Table: TSQLiteTable;
i: Integer;
begin
Result := [];
Table := Query(SQL, Bindings);
try
if not Table.EoF then
begin
SetLength(Result, Table.ColCount);
for i := 0 to Table.ColCount - 1 do
case Table.FieldType(i) of
SQLITE_NULL:
Result[i] := Null;
SQLITE_INTEGER:
Result[i] := Table.FieldAsInteger(i);
SQLITE_FLOAT:
Result[i] := Table.FieldAsDouble(i);
SQLITE_TEXT:
Result[i] := Table.FieldAsString(i);
SQLITE_BLOB:
Result[i] := Null;