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