aboutsummaryrefslogtreecommitdiffstats
path: root/us_maker_edition/src/lib/SQLite/example/uTestSqlite.pas
blob: 484be71c6ca82ee11056615e4ca557c1080458a1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
unit uTestSqlite;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,SQLiteTable3, ExtCtrls, jpeg;

type
  TForm1 = class(TForm)
    btnTest: TButton;
    memNotes: TMemo;
    Label1: TLabel;
    Label2: TLabel;
    ebName: TEdit;
    Label3: TLabel;
    ebNumber: TEdit;
    Label4: TLabel;
    ebID: TEdit;
    Image1: TImage;
    btnLoadImage: TButton;
    btnDisplayImage: TButton;
    procedure btnTestClick(Sender: TObject);
    procedure btnLoadImageClick(Sender: TObject);
    procedure btnDisplayImageClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btnTestClick(Sender: TObject);
var
slDBpath: string;
sldb: TSQLiteDatabase;
sltb: TSQLIteTable;
sSQL: String;
Notes: String;

begin

slDBPath := ExtractFilepath(application.exename)
+ 'test.db';

sldb := TSQLiteDatabase.Create(slDBPath);
try

if sldb.TableExists('testTable') then begin
sSQL := 'DROP TABLE testtable';
sldb.execsql(sSQL);
end;

sSQL := 'CREATE TABLE testtable ([ID] INTEGER PRIMARY KEY,[OtherID] INTEGER NULL,';
sSQL := sSQL + '[Name] VARCHAR (255),[Number] FLOAT, [notes] BLOB, [picture] BLOB COLLATE NOCASE);';

sldb.execsql(sSQL);

sldb.execsql('CREATE INDEX TestTableName ON [testtable]([Name]);');

//begin a transaction
sldb.BeginTransaction;

sSQL := 'INSERT INTO testtable(Name,OtherID,Number,Notes) VALUES ("Some Name",4,587.6594,"Here are some notes");';
//do the insert
sldb.ExecSQL(sSQL);

sSQL := 'INSERT INTO testtable(Name,OtherID,Number,Notes) VALUES ("Another Name",12,4758.3265,"More notes");';
//do the insert
sldb.ExecSQL(sSQL);

//end the transaction
sldb.Commit;

//query the data
sltb := slDb.GetTable('SELECT * FROM testtable');
try

if sltb.Count > 0 then
begin
//display first row

ebName.Text := sltb.FieldAsString(sltb.FieldIndex['Name']);
ebID.Text := inttostr(sltb.FieldAsInteger(sltb.FieldIndex['ID']));
ebNumber.Text := floattostr( sltb.FieldAsDouble(sltb.FieldIndex['Number']));
Notes :=  sltb.FieldAsBlobText(sltb.FieldIndex['Notes']);
memNotes.Text := notes;

end;

finally
sltb.Free;
end;

finally
sldb.Free;

end;

end;

procedure TForm1.btnLoadImageClick(Sender: TObject);
var
slDBpath: string;
sldb: TSQLiteDatabase;
sltb: TSQLIteTable;
iID: integer;
fs: TFileStream;

begin

slDBPath := ExtractFilepath(application.exename)
+ 'test.db';

if not FileExists(slDBPath) then begin
MessageDLg('Test.db does not exist. Click Test Sqlite 3 to create it.',mtInformation,[mbOK],0);
exit;
end;

sldb := TSQLiteDatabase.Create(slDBPath);
try

//get an ID
//query the data
sltb := slDb.GetTable('SELECT ID FROM testtable');
try

if sltb.Count = 0 then begin
MessageDLg('There are no rows in the database. Click Test Sqlite 3 to insert a row.',mtInformation,[mbOK],0);
exit;
end;

iID := sltb.FieldAsInteger(sltb.FieldIndex['ID']);

finally
sltb.Free;
end;

//load an image
fs := TFileStream.Create(ExtractFileDir(application.ExeName) + '\sunset.jpg',fmOpenRead);
try

//insert the image into the db
sldb.UpdateBlob('UPDATE testtable set picture = ? WHERE ID = ' + inttostr(iID),fs);

finally
fs.Free;
end;

finally
sldb.Free;

end;

end;

procedure TForm1.btnDisplayImageClick(Sender: TObject);
var
slDBpath: string;
sldb: TSQLiteDatabase;
sltb: TSQLIteTable;
iID: integer;
ms: TMemoryStream;
pic: TJPegImage;

begin

slDBPath := ExtractFilepath(application.exename)
+ 'test.db';

if not FileExists(slDBPath) then begin
MessageDLg('Test.db does not exist. Click Test Sqlite 3 to create it, then Load image to load an image.',mtInformation,[mbOK],0);
exit;
end;

sldb := TSQLiteDatabase.Create(slDBPath);
try

//get an ID
//query the data
sltb := slDb.GetTable('SELECT ID FROM testtable');
try

if not sltb.Count = 0 then begin
MessageDLg('No rows in the test database. Click Test Sqlite 3 to insert a row, then Load image to load an image.',mtInformation,[mbOK],0);
exit;
end;

iID := sltb.FieldAsInteger(sltb.FieldIndex['ID']);

finally
sltb.Free;
end;

sltb := sldb.GetTable('SELECT picture FROM testtable where ID = ' + inttostr(iID));
try

ms := sltb.FieldAsBlob(sltb.FieldIndex['picture']);
//note that the memory stream is freed when the TSqliteTable is destroyed.

if (ms = nil) then begin
MessageDLg('No image in the test database. Click Load image to load an image.',mtInformation,[mbOK],0);
exit;
end;

ms.Position := 0;

pic := TJPEGImage.Create;
pic.LoadFromStream(ms);

self.Image1.Picture.Graphic := pic;

pic.Free;

finally
sltb.Free;
end;

finally
sldb.Free;

end;


end;

end.