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
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
|
/*
** 2014-08-18
**
** The author disclaims copyright to this source code. In place of
** a legal notice, here is a blessing:
**
** May you do good and not evil.
** May you find forgiveness for yourself and forgive others.
** May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains code to implement the "changeset" command line
** utility for displaying and transforming changesets generated by
** the Sessions extension.
*/
#include "sqlite3.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
/*
** Show a usage message on stderr then quit.
*/
static void usage(const char *argv0){
fprintf(stderr, "Usage: %s FILENAME COMMAND ...\n", argv0);
fprintf(stderr,
"COMMANDs:\n"
" apply DB Apply the changeset to database file DB\n"
" concat FILE2 OUT Concatenate FILENAME and FILE2 into OUT\n"
" dump Show the complete content of the changeset\n"
" invert OUT Write an inverted changeset into file OUT\n"
" sql Give a pseudo-SQL rendering of the changeset\n"
);
exit(1);
}
/*
** Read the content of a disk file into an in-memory buffer
*/
static void readFile(const char *zFilename, int *pSz, void **ppBuf){
FILE *f;
int sz;
void *pBuf;
f = fopen(zFilename, "rb");
if( f==0 ){
fprintf(stderr, "cannot open \"%s\" for reading\n", zFilename);
exit(1);
}
fseek(f, 0, SEEK_END);
sz = (int)ftell(f);
rewind(f);
pBuf = sqlite3_malloc( sz ? sz : 1 );
if( pBuf==0 ){
fprintf(stderr, "cannot allocate %d to hold content of \"%s\"\n",
sz, zFilename);
exit(1);
}
if( sz>0 ){
if( fread(pBuf, sz, 1, f)!=1 ){
fprintf(stderr, "cannot read all %d bytes of \"%s\"\n", sz, zFilename);
exit(1);
}
fclose(f);
}
*pSz = sz;
*ppBuf = pBuf;
}
/* Array for converting from half-bytes (nybbles) into ASCII hex
** digits. */
static const char hexdigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
/*
** Render an sqlite3_value as an SQL string.
*/
static void renderValue(sqlite3_value *pVal){
switch( sqlite3_value_type(pVal) ){
case SQLITE_FLOAT: {
double r1;
char zBuf[50];
r1 = sqlite3_value_double(pVal);
sqlite3_snprintf(sizeof(zBuf), zBuf, "%!.15g", r1);
printf("%s", zBuf);
break;
}
case SQLITE_INTEGER: {
printf("%lld", sqlite3_value_int64(pVal));
break;
}
case SQLITE_BLOB: {
char const *zBlob = sqlite3_value_blob(pVal);
int nBlob = sqlite3_value_bytes(pVal);
int i;
printf("x'");
for(i=0; i<nBlob; i++){
putchar(hexdigits[(zBlob[i]>>4)&0x0F]);
putchar(hexdigits[(zBlob[i])&0x0F]);
}
putchar('\'');
break;
}
case SQLITE_TEXT: {
const unsigned char *zArg = sqlite3_value_text(pVal);
putchar('\'');
while( zArg[0] ){
putchar(zArg[0]);
if( zArg[0]=='\'' ) putchar(zArg[0]);
zArg++;
}
putchar('\'');
break;
}
default: {
assert( sqlite3_value_type(pVal)==SQLITE_NULL );
printf("NULL");
break;
}
}
}
int main(int argc, char **argv){
int sz, rc;
void *pBuf = 0;
if( argc<3 ) usage(argv[0]);
readFile(argv[1], &sz, &pBuf);
/* changeset FILENAME apply DB
** Apply the changeset in FILENAME to the database file DB
*/
if( strcmp(argv[2],"apply")==0 ){
fprintf(stderr, "not yet implemented\n");
}else
/* changeset FILENAME concat FILE2 OUT
** Add changeset FILE2 onto the end of the changeset in FILENAME
** and write the result into OUT.
*/
if( strcmp(argv[2],"concat")==0 ){
fprintf(stderr, "not yet implemented\n");
}else
/* changeset FILENAME dump
** Show the complete content of the changeset in FILENAME
*/
if( strcmp(argv[2],"dump")==0 ){
int cnt = 0;
int i;
sqlite3_changeset_iter *pIter;
rc = sqlite3changeset_start(&pIter, sz, pBuf);
if( rc!=SQLITE_OK ){
fprintf(stderr, "sqlite3changeset_start() returns %d\n", rc);
exit(1);
}
while( sqlite3changeset_next(pIter)==SQLITE_ROW ){
int op, bIndirect, nCol;
const char *zTab;
unsigned char *abPK;
sqlite3changeset_op(pIter, &zTab, &nCol, &op, &bIndirect);
cnt++;
printf("%d: %s table=[%s] indirect=%d nColumn=%d\n",
cnt, op==SQLITE_INSERT ? "INSERT" :
op==SQLITE_UPDATE ? "UPDATE" : "DELETE",
zTab, bIndirect, nCol);
sqlite3changeset_pk(pIter, &abPK, 0);
for(i=0; i<nCol; i++){
sqlite3_value *pVal;
pVal = 0;
sqlite3changeset_old(pIter, i, &pVal);
if( pVal ){
printf(" old[%d]%s = ", i, abPK[i] ? "pk" : " ");
renderValue(pVal);
printf("\n");
}
pVal = 0;
sqlite3changeset_new(pIter, i, &pVal);
if( pVal ){
printf(" new[%d]%s = ", i, abPK[i] ? "pk" : " ");
renderValue(pVal);
printf("\n");
}
}
}
sqlite3changeset_finalize(pIter);
}else
/* changeset FILENAME invert OUT
** Invert the changes in FILENAME and writes the result on OUT
*/
if( strcmp(argv[2],"invert")==0 ){
FILE *out;
int szOut = 0;
void *pOutBuf = 0;
if( argc!=4 ) usage(argv[0]);
out = fopen(argv[3], "wb");
if( out==0 ){
fprintf(stderr, "cannot open \"%s\" for writing\n", argv[3]);
exit(1);
}
sqlite3changeset_invert(sz, pBuf, &szOut, &pOutBuf);
if( fwrite(pOutBuf, szOut, 1, out)!=1 ){
fprintf(stderr, "unable to write all %d bytes of output to \"%s\"\n",
szOut, argv[3]);
}
fclose(out);
sqlite3_free(pOutBuf);
}else
/* changeset FILE sql
** Show the content of the changeset as pseudo-SQL
*/
if( strcmp(argv[2],"sql")==0 ){
int cnt = 0;
char *zPrevTab = 0;
char *zSQLTabName = 0;
sqlite3_changeset_iter *pIter = 0;
rc = sqlite3changeset_start(&pIter, sz, pBuf);
if( rc!=SQLITE_OK ){
fprintf(stderr, "sqlite3changeset_start() returns %d\n", rc);
exit(1);
}
printf("BEGIN;\n");
while( sqlite3changeset_next(pIter)==SQLITE_ROW ){
int op, bIndirect, nCol;
const char *zTab;
sqlite3changeset_op(pIter, &zTab, &nCol, &op, &bIndirect);
cnt++;
if( zPrevTab==0 || strcmp(zPrevTab,zTab)!=0 ){
sqlite3_free(zPrevTab);
sqlite3_free(zSQLTabName);
zPrevTab = sqlite3_mprintf("%s", zTab);
if( !isalnum(zTab[0]) || sqlite3_strglob("*[^a-zA-Z0-9]*",zTab)==0 ){
zSQLTabName = sqlite3_mprintf("\"%w\"", zTab);
}else{
zSQLTabName = sqlite3_mprintf("%s", zTab);
}
printf("/****** Changes for table %s ***************/\n", zSQLTabName);
}
switch( op ){
case SQLITE_DELETE: {
unsigned char *abPK;
int i;
const char *zSep = " ";
sqlite3changeset_pk(pIter, &abPK, 0);
printf("/* %d */ DELETE FROM %s WHERE", cnt, zSQLTabName);
for(i=0; i<nCol; i++){
sqlite3_value *pVal;
if( abPK[i]==0 ) continue;
printf("%sc%d=", zSep, i+1);
zSep = " AND ";
sqlite3changeset_old(pIter, i, &pVal);
renderValue(pVal);
}
printf(";\n");
break;
}
case SQLITE_UPDATE: {
unsigned char *abPK;
int i;
const char *zSep = " ";
sqlite3changeset_pk(pIter, &abPK, 0);
printf("/* %d */ UPDATE %s SET", cnt, zSQLTabName);
for(i=0; i<nCol; i++){
sqlite3_value *pVal = 0;
sqlite3changeset_new(pIter, i, &pVal);
if( pVal ){
printf("%sc%d=", zSep, i+1);
zSep = ", ";
renderValue(pVal);
}
}
printf(" WHERE");
zSep = " ";
for(i=0; i<nCol; i++){
sqlite3_value *pVal;
if( abPK[i]==0 ) continue;
printf("%sc%d=", zSep, i+1);
zSep = " AND ";
sqlite3changeset_old(pIter, i, &pVal);
renderValue(pVal);
}
printf(";\n");
break;
}
case SQLITE_INSERT: {
int i;
printf("/* %d */ INSERT INTO %s VALUES", cnt, zSQLTabName);
for(i=0; i<nCol; i++){
sqlite3_value *pVal;
printf("%c", i==0 ? '(' : ',');
sqlite3changeset_new(pIter, i, &pVal);
renderValue(pVal);
}
printf(");\n");
break;
}
}
}
printf("COMMIT;\n");
sqlite3changeset_finalize(pIter);
sqlite3_free(zPrevTab);
sqlite3_free(zSQLTabName);
}else
/* If nothing else matches, show the usage comment */
usage(argv[0]);
sqlite3_free(pBuf);
return 0;
}
|
