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
|
/*
** This utility program decodes and displays the content of the
** sqlite_stat4 table in the database file named on the command
** line.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <ctype.h>
#include "sqlite3.h"
#define ISPRINT(X) isprint((unsigned char)(X))
typedef sqlite3_int64 i64; /* 64-bit signed integer type */
/*
** Convert the var-int format into i64. Return the number of bytes
** in the var-int. Write the var-int value into *pVal.
*/
static int decodeVarint(const unsigned char *z, i64 *pVal){
i64 v = 0;
int i;
for(i=0; i<8; i++){
v = (v<<7) + (z[i]&0x7f);
if( (z[i]&0x80)==0 ){ *pVal = v; return i+1; }
}
v = (v<<8) + (z[i]&0xff);
*pVal = v;
return 9;
}
int main(int argc, char **argv){
sqlite3 *db;
sqlite3_stmt *pStmt;
char *zIdx = 0;
int rc, j, x, y, mxHdr;
const unsigned char *aSample;
int nSample;
i64 iVal;
const char *zSep;
int iRow = 0;
if( argc!=2 ){
fprintf(stderr, "Usage: %s DATABASE-FILE\n", argv[0]);
exit(1);
}
rc = sqlite3_open(argv[1], &db);
if( rc!=SQLITE_OK || db==0 ){
fprintf(stderr, "Cannot open database file [%s]\n", argv[1]);
exit(1);
}
rc = sqlite3_prepare_v2(db,
"SELECT tbl||'.'||idx, nEq, nLT, nDLt, sample "
"FROM sqlite_stat4 ORDER BY 1", -1,
&pStmt, 0);
if( rc!=SQLITE_OK || pStmt==0 ){
fprintf(stderr, "%s\n", sqlite3_errmsg(db));
sqlite3_close(db);
exit(1);
}
while( SQLITE_ROW==sqlite3_step(pStmt) ){
if( zIdx==0 || strcmp(zIdx, (const char*)sqlite3_column_text(pStmt,0))!=0 ){
if( zIdx ) printf("\n**************************************"
"**************\n\n");
sqlite3_free(zIdx);
zIdx = sqlite3_mprintf("%s", sqlite3_column_text(pStmt,0));
iRow = 0;
}
printf("%s sample %d ------------------------------------\n", zIdx, ++iRow);
printf(" nEq = %s\n", sqlite3_column_text(pStmt,1));
printf(" nLt = %s\n", sqlite3_column_text(pStmt,2));
printf(" nDLt = %s\n", sqlite3_column_text(pStmt,3));
printf(" sample = x'");
aSample = sqlite3_column_blob(pStmt,4);
nSample = sqlite3_column_bytes(pStmt,4);
for(j=0; j<nSample; j++) printf("%02x", aSample[j]);
printf("'\n ");
zSep = " ";
x = decodeVarint(aSample, &iVal);
if( iVal<x || iVal>nSample ){
printf(" <error>\n");
continue;
}
y = mxHdr = (int)iVal;
while( x<mxHdr ){
int sz;
i64 v;
x += decodeVarint(aSample+x, &iVal);
if( x>mxHdr ) break;
if( iVal<0 ) break;
switch( iVal ){
case 0: sz = 0; break;
case 1: sz = 1; break;
case 2: sz = 2; break;
case 3: sz = 3; break;
case 4: sz = 4; break;
case 5: sz = 6; break;
case 6: sz = 8; break;
case 7: sz = 8; break;
case 8: sz = 0; break;
case 9: sz = 0; break;
case 10:
case 11: sz = 0; break;
default: sz = (int)(iVal-12)/2; break;
}
if( y+sz>nSample ) break;
if( iVal==0 ){
printf("%sNULL", zSep);
}else if( iVal==8 || iVal==9 ){
printf("%s%d", zSep, ((int)iVal)-8);
}else if( iVal<=7 ){
v = (signed char)aSample[y];
for(j=1; j<sz; j++){
v = (v<<8) + aSample[y+j];
}
if( iVal==7 ){
double r;
char *z;
memcpy(&r, &v, sizeof(r));
z = sqlite3_mprintf("%s%!.15g", zSep, r);
printf("%s", z);
sqlite3_free(z);
}else{
printf("%s%lld", zSep, v);
}
}else if( (iVal&1)==0 ){
printf("%sx'", zSep);
for(j=0; j<sz; j++){
printf("%02x", aSample[y+j]);
}
printf("'");
}else{
printf("%s'", zSep);
for(j=0; j<sz; j++){
char c = (char)aSample[y+j];
if( ISPRINT(c) ){
if( c=='\'' || c=='\\' ) putchar('\\');
putchar(c);
}else if( c=='\n' ){
printf("\\n");
}else if( c=='\t' ){
printf("\\t");
}else if( c=='\r' ){
printf("\\r");
}else{
printf("\\%03o", c);
}
}
printf("'");
}
zSep = ",";
y += sz;
}
printf("\n");
}
sqlite3_free(zIdx);
sqlite3_finalize(pStmt);
sqlite3_close(db);
return 0;
}
|
