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Overview
Comment:Add the ".info" command to the shell.
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SHA1: 0a3100a7f264ffce6078c35e341f2f0af6c09fbb
User & Date: drh 2015-02-06 14:19:44
Context
2015-02-06
14:51
Change the name of ".info" to ".dbinfo" and add an optional second argument which is the ATTACH-ed DB about which information is provided. Provide ".indexes" as an alternative name to the legacy ".indices" command. check-in: 0f65a7e2 user: drh tags: trunk
14:19
Add the ".info" command to the shell. check-in: 0a3100a7 user: drh tags: trunk
01:07
Add the index_xinfo pragma which gives information about the fields that reference the table PRIMARY KEY in addition to the index key fields. Add extra columns "desc", "coll", and "key" to the index_info and index_xinfo pragmas. Add the "origin" and "partial" columns to the index_list pragma. check-in: 2743846c user: drh tags: trunk
Changes
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Changes to src/shell.c.

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  ".fullschema            Show schema and the content of sqlite_stat tables\n"
  ".headers on|off        Turn display of headers on or off\n"
  ".help                  Show this message\n"
  ".import FILE TABLE     Import data from FILE into TABLE\n"
  ".indices ?TABLE?       Show names of all indices\n"
  "                         If TABLE specified, only show indices for tables\n"
  "                         matching LIKE pattern TABLE.\n"

#ifdef SQLITE_ENABLE_IOTRACE
  ".iotrace FILE          Enable I/O diagnostic logging to FILE\n"
#endif
#ifndef SQLITE_OMIT_LOAD_EXTENSION
  ".load FILE ?ENTRY?     Load an extension library\n"
#endif
  ".log FILE|off          Turn logging on or off.  FILE can be stderr/stdout\n"
................................................................................
    pclose(p->out);
  }else{
    output_file_close(p->out);
  }
  p->outfile[0] = 0;
  p->out = stdout;
}




























































































/*
** If an input line begins with "." then invoke this routine to
** process that line.
**
** Return 1 on error, 2 to exit, and 0 otherwise.
*/
................................................................................
      sqlite3_free(zErrMsg);
      rc = 1;
    }else if( rc != SQLITE_OK ){
      fprintf(stderr,"Error: querying sqlite_master and sqlite_temp_master\n");
      rc = 1;
    }
  }else





#ifdef SQLITE_ENABLE_IOTRACE
  if( c=='i' && strncmp(azArg[0], "iotrace", n)==0 ){
    extern void (*sqlite3IoTrace)(const char*, ...);
    if( iotrace && iotrace!=stdout ) fclose(iotrace);
    iotrace = 0;
    if( nArg<2 ){







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  ".fullschema            Show schema and the content of sqlite_stat tables\n"
  ".headers on|off        Turn display of headers on or off\n"
  ".help                  Show this message\n"
  ".import FILE TABLE     Import data from FILE into TABLE\n"
  ".indices ?TABLE?       Show names of all indices\n"
  "                         If TABLE specified, only show indices for tables\n"
  "                         matching LIKE pattern TABLE.\n"
  ".info                  Show status information about the database\n"
#ifdef SQLITE_ENABLE_IOTRACE
  ".iotrace FILE          Enable I/O diagnostic logging to FILE\n"
#endif
#ifndef SQLITE_OMIT_LOAD_EXTENSION
  ".load FILE ?ENTRY?     Load an extension library\n"
#endif
  ".log FILE|off          Turn logging on or off.  FILE can be stderr/stdout\n"
................................................................................
    pclose(p->out);
  }else{
    output_file_close(p->out);
  }
  p->outfile[0] = 0;
  p->out = stdout;
}

/*
** Run an SQL command and return the single integer result.
*/
static int db_int(ShellState *p, const char *zSql){
  sqlite3_stmt *pStmt;
  int res = 0;
  sqlite3_prepare_v2(p->db, zSql, -1, &pStmt, 0);
  if( pStmt && sqlite3_step(pStmt)==SQLITE_ROW ){
    res = sqlite3_column_int(pStmt,0);
  }
  sqlite3_finalize(pStmt);
  return res;
}

/*
** Convert a 2-byte or 4-byte big-endian integer into a native integer
*/
unsigned int get2byteInt(unsigned char *a){
  return (a[0]<<8) + a[1];
}
unsigned int get4byteInt(unsigned char *a){
  return (a[0]<<24) + (a[1]<<16) + (a[2]<<8) + a[3];
}

/*
** Implementation of the ".info" command.
**
** Return 1 on error, 2 to exit, and 0 otherwise.
*/
static int shell_info_command(ShellState *p){
  sqlite3_file *pFile;
  int i;    
  unsigned char aHdr[100];
  static const struct { const char *zName; int ofst; } aField[] = {
     { "file change counter:",  24  },
     { "database page count:",  28  },
     { "freelist page count:",  36  },
     { "schema cookie:",        40  },
     { "schema format:",        44  },
     { "default cache size:",   48  },
     { "autovacuum top root:",  52  },
     { "incremental vacuum:",   64  },
     { "text encoding:",        56  },
     { "user version:",         60  },
     { "application id:",       68  },
     { "software version:",     96  },
  };
  open_db(p, 0);
  if( p->db==0 ) return 1;
  sqlite3_file_control(p->db, "main", SQLITE_FCNTL_FILE_POINTER, &pFile);
  if( pFile==0 || pFile->pMethods==0 || pFile->pMethods->xRead==0 ){
    return 1;
  }
  i = pFile->pMethods->xRead(pFile, aHdr, 100, 0);
  if( i!=SQLITE_OK ){
    fprintf(stderr, "unable to read database header\n");
    return 1;
  }
  i = get2byteInt(aHdr+16);
  if( i==1 ) i = 65536;
  fprintf(p->out, "%-20s %d\n", "database page size:", i);
  fprintf(p->out, "%-20s %d\n", "write format:", aHdr[18]);
  fprintf(p->out, "%-20s %d\n", "read format:", aHdr[19]);
  fprintf(p->out, "%-20s %d\n", "reserved bytes:", aHdr[20]);
  for(i=0; i<sizeof(aField)/sizeof(aField[0]); i++){
    int ofst = aField[i].ofst;
    unsigned int val = get4byteInt(aHdr + ofst);
    fprintf(p->out, "%-20s %u", aField[i].zName, val);
    switch( ofst ){
      case 56: {
        if( val==1 ) fprintf(p->out, " (utf8)"); 
        if( val==2 ) fprintf(p->out, " (utf16le)"); 
        if( val==3 ) fprintf(p->out, " (utf16be)"); 
      }
    }
    fprintf(p->out, "\n");
  }
  fprintf(p->out, "%-20s %d\n", "number of tables:",
          db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='table'"));
  fprintf(p->out, "%-20s %d\n", "number of indexes:",
          db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='index'"));
  fprintf(p->out, "%-20s %d\n", "number of triggers:",
          db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='trigger'"));
  fprintf(p->out, "%-20s %d\n", "number of views:",
          db_int(p, "SELECT count(*) FROM sqlite_master WHERE type='view'"));
  fprintf(p->out, "%-20s %d\n", "schema size:",
          db_int(p, "SELECT total(length(sql)) FROM sqlite_master"));
  return 0;
}


/*
** If an input line begins with "." then invoke this routine to
** process that line.
**
** Return 1 on error, 2 to exit, and 0 otherwise.
*/
................................................................................
      sqlite3_free(zErrMsg);
      rc = 1;
    }else if( rc != SQLITE_OK ){
      fprintf(stderr,"Error: querying sqlite_master and sqlite_temp_master\n");
      rc = 1;
    }
  }else

  if( c=='i' && strncmp(azArg[0], "info", n)==0 ){
    rc = shell_info_command(p);
  }else

#ifdef SQLITE_ENABLE_IOTRACE
  if( c=='i' && strncmp(azArg[0], "iotrace", n)==0 ){
    extern void (*sqlite3IoTrace)(const char*, ...);
    if( iotrace && iotrace!=stdout ) fclose(iotrace);
    iotrace = 0;
    if( nArg<2 ){