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| ///////////////////////////////////////////////////////////////////////////
// //
// Copyright (c) 2015 by Charta Software B.V. //
// All rights reserved //
// //
// Version: 1.7.0.83525 //
// Web site: https://pascal.chartasoftware.com/ //
// //
// This code and information are provided "as is" without warranty of //
// any kind. Dissemination of this information or reproduction of //
// this material is strictly forbidden unless prior written permission //
// is obtained from Charta Software B.V.. //
// //
///////////////////////////////////////////////////////////////////////////
unit Sql.Database.Physical.Sqlite;
interface
uses
Boolean,
Byte,
Character.Encoding,
Dll,
FloatingPoint._64,
Integer,
Integer._32,
Integer._64,
Memory.Pointer,
Sql.Connection.Settings,
Sql.Database,
Sql.Database.Logical.Compatibility,
Sql.Database.Physical.FileBased,
Sql.Database.Physical.FileBased.Connector,
Sql.Database.PreparedStatement,
Sql.Exception,
Sql.Result,
Sql.Statement,
Text,
Type_,
Value;
type
TSqlite3 = TPointer;
TSqlite3Statement = TPointer;
TSqlite3Api = class(TDll)
public
Open: function (FileName: TPointer; out Db: TSqlite3): TInteger32; cdecl;
Prepare: function (Db: TSqlite3; zSql: TPointer; nByte: TInteger32; out Stmt: TSqlite3Statement; pzTail: TPointer): TInteger32; cdecl;
Step: function (Stmt: TSqlite3Statement): TInteger32; cdecl;
Finalize: function (Stmt: TSqlite3Statement): TInteger32; cdecl;
Close: function (Db: TSqlite3): TInteger32; cdecl;
ErrorMsg: function (Db: TSqlite3): TPointer; cdecl;
LastInsertRowid: function (Db: TSqlite3): TInteger64; cdecl;
ColumnBytes: function (Stmt: TSqlite3Statement; iCol: TInteger32): TInteger32; cdecl;
ColumnType: function (Stmt: TSqlite3Statement; iCol: TInteger32): TInteger32; cdecl;
ColumnText: function (Stmt: TSqlite3Statement; iCol: TInteger32): TPointer; cdecl;
ColumnInt64: function (Stmt: TSqlite3Statement; iCol: TInteger32): TInteger64; cdecl;
ColumnDouble: function (Stmt: TSqlite3Statement; iCol: TInteger32): TFloatingPoint64; cdecl;
ColumnBlob: function (Stmt: TSqlite3Statement; iCol: TInteger32): TPointer; cdecl;
BusyTimeout: function (Db: TSqlite3; ms: TInteger32): TInteger32; cdecl;
constructor Create(); override;
public
const
SQLITE_OK = 0;
SQLITE_ERROR = 1;
SQLITE_INTERNAL = 2;
SQLITE_PERM = 3;
SQLITE_ABORT = 4;
SQLITE_BUSY = 5;
SQLITE_LOCKED = 6;
SQLITE_NOMEM = 7;
SQLITE_READONLY = 8;
SQLITE_INTERRUPT = 9;
SQLITE_IOERR = 10;
SQLITE_CORRUPT = 11;
SQLITE_NOTFOUND = 12;
SQLITE_FULL = 13;
SQLITE_CANTOPEN = 14;
SQLITE_PROTOCOL = 15;
SQLITE_EMPTY = 16;
SQLITE_SCHEMA = 17;
SQLITE_TOOBIG = 18;
SQLITE_CONSTRAINT = 19;
SQLITE_MISMATCH = 20;
SQLITE_MISUSE = 21;
SQLITE_NOLFS = 22;
SQLITE_AUTH = 23;
SQLITE_FORMAT = 24;
SQLITE_RANGE = 25;
SQLITE_NOTADB = 26;
SQLITE_NOTICE = 27;
SQLITE_WARNING = 28;
SQLITE_ROW = 100;
SQLITE_DONE = 101;
const
SQLITE_INTEGER = 1;
SQLITE_FLOAT = 2;
SQLITE_TEXT = 3;
SQLITE_BLOB = 4;
SQLITE_NULL = 5;
end;
TSqliteCompatibilityDatabase = class(TCompatibilitySqlDatabase)
public
function Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod = sqrmStoreResult): TSqlResult; override;
end;
ESqlite = class(ESql);
TSqlite = class(TSqlFileBasedDatabase)
private
Api: TSqlite3Api;
Handle: TSqlite3;
Encoding: TCharacterEncoding;
Connected: TBoolean;
procedure RaiseError(Value: TInteger32); overload;
procedure RaiseError(Value: TInteger32; const Sql: TText); overload;
procedure CheckError(Value: TInteger32); overload;
procedure CheckError(Value: TInteger32; const Sql: TText); overload;
function ToUtf8(Value: TText): TArray<TByte>;
function CompileStatement(Statement: TSqlStatement): TText;
procedure ExecuteSql(const Sql: TText);
protected
procedure ExecuteStartTransaction(); override;
procedure ExecuteCommitTransaction(); override;
procedure ExecuteRollbackTransaction(); override;
function GetCouldConnect(): TBoolean; override;
public
constructor Create(ConnectionSettings: TSqlConnectionSettings); override;
destructor Destroy(); override;
function Embellish(): TSqlDatabase; override;
function Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod = sqrmStoreResult): TSqlResult; override;
function Prepare(Statement: TSqlStatement): TSqlPreparedStatement; override;
function ConnectionIdentifier(): TInteger; override;
function InsertId(): TInteger; override;
function NumberOfAffectedRows(): TInteger; override;
function IsAlive(): TBoolean; override;
function UserExists(const Name: TText): TBoolean; override;
// TODO: We return a TObject which actually is a TSqlSystemInformation to prevent circular unit references
function GetSystemInformation(): TObject; override;
end;
TSqliteValueConverter = class(TObject)
protected
function ConvertTo2dGeometry(Value: TValue): TValue;
public
function Convert(Value: TValue; Type_: TType; SqliteType: TInteger32): TValue;
end;
TSqliteConnector = class(TSqlFileBasedDatabaseConnector)
protected
function CreateConnection(): TSqlDatabase; override;
end;
implementation
uses
Exception.NotImplemented,
FloatingPoint.Value,
Geometry._2d.Type_,
Geometry._2d.WellKnownFormat.Binary.Reader,
Integer._32.TextFormat,
Integer.Value,
Memory.Block,
Memory.Block.Physical,
OctetString.Value,
Sql.Database.Logical.Hierarchical,
Sql.Database.Logical.PrepareBlob,
Sql.Database.Logical.Versioned,
Sql.Database.Physical.Sqlite.Compiler,
Sql.Result.RecordSet,
Sql.Statement.DataDefinition.Database.Create,
Sql.Statement.ResultSet,
Sql.Variable,
Stream.Input,
Text.Value,
Type_.Structured,
Type_.Structured.Value,
Value.Unknown,
Windows.Api.Kernel.DateTime;
{ TSqlite3Api }
constructor TSqlite3Api.Create();
begin
inherited Create();
AddEntry('sqlite3_busy_timeout', @@BusyTimeout);
AddEntry('sqlite3_column_blob', @@ColumnBlob);
AddEntry('sqlite3_column_bytes', @@ColumnBytes);
AddEntry('sqlite3_column_double', @@ColumnDouble);
AddEntry('sqlite3_column_int64', @@ColumnInt64);
AddEntry('sqlite3_column_text', @@ColumnText);
AddEntry('sqlite3_column_type', @@ColumnType);
AddEntry('sqlite3_close', @@Close);
AddEntry('sqlite3_errmsg', @@ErrorMsg);
AddEntry('sqlite3_finalize', @@Finalize);
AddEntry('sqlite3_last_insert_rowid', @@LastInsertRowid);
AddEntry('sqlite3_open', @@Open);
AddEntry('sqlite3_prepare', @@Prepare);
AddEntry('sqlite3_step', @@Step);
end;
{ TSqlite }
procedure TSqlite.CheckError(Value: TInteger32);
begin
if Value <> Api.SQLITE_OK then
RaiseError(Value);
end;
procedure TSqlite.CheckError(Value: TInteger32; const Sql: TText);
begin
if Value <> Api.SQLITE_OK then
RaiseError(Value, Sql);
end;
function TSqlite.CompileStatement(Statement: TSqlStatement): TText;
var
Compiler: TSqliteCompiler;
begin
Statement.AddReference();
Compiler := TSqliteCompiler.Create();
Result := Compiler.Compile(TCharacterEncoding.Utf8, Statement);
Compiler.Free();
Statement.ReleaseReference();
end;
function TSqlite.ConnectionIdentifier(): TInteger;
begin
raise ENotImplemented.Create(ClassType, 'ConnectionIdentifier');
end;
constructor TSqlite.Create(ConnectionSettings: TSqlConnectionSettings);
var
Name: TArray<TByte>;
begin
inherited Create(ConnectionSettings);
Encoding := TCharacterEncoding.Utf8;
Api := TSqlite3Api.Create();
Api.Load('sqlite3.dll');
if Api.IsLoaded then
begin
Name := ToUtf8(ConnectionSettings.DatabaseName);
CheckError(Api.Open(@Name[0], Handle));
Api.BusyTimeout(Handle, 10000);
Connected := True;
ExecuteSql('PRAGMA journal_mode = WAL');
ExecuteSql('PRAGMA foreign_keys = ON');
end
else
raise ESqlite.Create('Could not find DLL: sqlite3.dll');
end;
destructor TSqlite.Destroy();
begin
CheckError(Api.Close(Handle));
Api.Free();
inherited Destroy();
end;
function TSqlite.Embellish(): TSqlDatabase;
begin
Result :=
THierarchicalSqlDatabase.Create(
TVersionedSqlDatabase.Create(
TPrepareBlobSqlDatabase.Create(TSqliteCompatibilityDatabase.Create(inherited Embellish(), True), True),
True
),
True
);
end;
procedure TSqlite.ExecuteCommitTransaction();
begin
ExecuteSql('COMMIT TRANSACTION');
end;
procedure TSqlite.ExecuteRollbackTransaction();
begin
ExecuteSql('ROLLBACK TRANSACTION');
end;
procedure TSqlite.ExecuteSql(const Sql: TText);
var
SqlBytes: TArray<TByte>;
PreparedStatement: TSqlite3Statement;
begin
SqlBytes := ToUtf8(Sql);
CheckError(Api.Prepare(Handle, @SqlBytes[0], -1, PreparedStatement, nil), Sql);
try
Api.Step(PreparedStatement);
finally
CheckError(Api.Finalize(PreparedStatement));
end;
end;
procedure TSqlite.ExecuteStartTransaction();
begin
ExecuteSql('BEGIN TRANSACTION');
end;
function TSqlite.GetCouldConnect(): TBoolean;
begin
Result := Connected;
end;
function TSqlite.GetSystemInformation(): TObject;
begin
raise ENotImplemented.Create(ClassType, 'GetSystemInformation');
end;
function TSqlite.InsertId(): TInteger;
begin
Result := Api.LastInsertRowid(Handle);
end;
function TSqlite.IsAlive(): TBoolean;
begin
Result := True;
end;
function TSqlite.NumberOfAffectedRows(): TInteger;
begin
raise ENotImplemented.Create(ClassType, 'NumberOfAffectedRows');
end;
function TSqlite.Prepare(Statement: TSqlStatement): TSqlPreparedStatement;
begin
raise ENotImplemented.Create(ClassType, 'Prepare');
end;
function TSqlite.Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
var
Sql: TText;
SqlBytes: TArray<TByte>;
PreparedStatement: TSqlite3Statement;
StatusCode: TInteger32;
Records: TRecordSet;
Record_: TRecord;
i: TInteger32;
ResultSetStatement: TSqlResultSetStatement;
Value: TValue;
ColumnType: TInteger32;
MemoryBlock: TMemoryBlock;
CharacterPointer: TPointer;
BlobPointer: TPointer;
ValueConverter: TSqliteValueConverter;
begin
Result := nil;
Statement.AddReference();
if not (Statement is TSqlCreateDatabase) then
begin
Sql := CompileStatement(Statement);
SqlBytes := ToUtf8(Sql);
CheckError(Api.Prepare(Handle, @SqlBytes[0], -1, PreparedStatement, nil), Sql);
try
StatusCode := Api.Step(PreparedStatement);
if Statement is TSqlResultSetStatement then
begin
ResultSetStatement := Statement as TSqlResultSetStatement;
Records := TRecordSet.Create(ResultSetStatement.GetRecordSetType() as TRecordSetType);
ValueConverter := TSqliteValueConverter.Create();
while StatusCode = Api.SQLITE_ROW do
begin
Record_ := TRecord.Create(Records.Type_.RecordType);
for i := 0 to ResultSetStatement.Columns.Count - 1 do
begin
ColumnType := Api.ColumnType(PreparedStatement, i);
case ColumnType of
Api.SQLITE_NULL:
Value := TUnknown.Create();
Api.SQLITE_INTEGER:
Value := TIntegerValue.Create(Api.ColumnInt64(PreparedStatement, i));
Api.SQLITE_FLOAT:
Value := TFloatingPointValue.Create(Api.ColumnDouble(PreparedStatement, i));
Api.SQLITE_TEXT:
begin
CharacterPointer := Api.ColumnText(PreparedStatement, i);
Value := TTextValue.Create(TText.New(TCharacterEncoding.Utf8, CharacterPointer, Api.ColumnBytes(PreparedStatement, i)));
end;
Api.SQLITE_BLOB:
begin
BlobPointer := Api.ColumnBlob(PreparedStatement, i);
MemoryBlock := TPhysicalMemoryBlock.Create(Api.ColumnBytes(PreparedStatement, i));
MemoryBlock.CopyFromAddress(BlobPointer);
Value := TOctetStringValue.Create(MemoryBlock);
end;
else
begin
raise ESqlite.Create('Unsupported column type: ' + Integer32ToText(ColumnType));
Value := nil;
end;
end;
Record_.Values.Add(ValueConverter.Convert(Value, Record_.Type_.Members[i].Type_, ColumnType));
end;
Records.Add(Record_);
StatusCode := Api.Step(PreparedStatement);
end;
ValueConverter.Free();
Result := TRecordSetSqlResult.Create(Records, Encoding);
end;
finally
CheckError(Api.Finalize(PreparedStatement));
end;
end;
Statement.ReleaseReference();
TickCountLastQuery := GetTickCount();
end;
procedure TSqlite.RaiseError(Value: TInteger32; const Sql: TText);
begin
raise ESqlQuery.Create(Sql, 'Error ' + Integer32ToText(Value) + ': ' + TText.New(Api.ErrorMsg(Handle)));
end;
procedure TSqlite.RaiseError(Value: TInteger32);
begin
raise ESqlite.Create('Error ' + Integer32ToText(Value) + ': ' + TText.New(Api.ErrorMsg(Handle)));
end;
function TSqlite.ToUtf8(Value: TText): TArray<TByte>;
begin
Value := Value.Recode(TCharacterEncoding.Utf8);
SetLength(Result, Value.Size + 1);
Move(Value.Address^, Result[0], Value.Size);
Result[High(Result)] := 0;
end;
function TSqlite.UserExists(const Name: TText): TBoolean;
begin
raise ENotImplemented.Create(ClassType, 'UserExists');
end;
{ TSqliteConnector }
function TSqliteConnector.CreateConnection(): TSqlDatabase;
begin
Result := TSqlite.Create(Settings);
end;
{ TSqliteCompatibilityDatabase }
function TSqliteCompatibilityDatabase.Query(Statement: TSqlStatement; ResultMethod: TSqlQueryResultMethod): TSqlResult;
begin
if Statement is TSqlSetVariable then
Result := nil // TODO: SQLite does not support variables, in fact we should probably remove variable support from our SQL layers
else
Result := inherited Query(Statement, ResultMethod);
end;
{ TSqliteValueConverter }
function TSqliteValueConverter.Convert(Value: TValue; Type_: TType; SqliteType: TInteger32): TValue;
begin
if (SqliteType = TSqlite3Api.SQLITE_BLOB) and (Type_ = T2dGeometryType.Any) then
Result := ConvertTo2dGeometry(Value)
else
Result := Value;
end;
function TSqliteValueConverter.ConvertTo2dGeometry(Value: TValue): TValue;
var
Memory: TMemoryBlock;
MemoryStream: TInputStream;
Reader: TWellKnownBinaryFormatReader;
begin
Value.AddReference();
Memory := (Value as TOctetStringValue).Value;
MemoryStream := Memory.CreateInputStream();
Reader := TWellKnownBinaryFormatReader.Create();
Result := Reader.Read(MemoryStream);
Reader.Free();
MemoryStream.Free();
Value.ReleaseReference();
end;
end.
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