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Overview
Comment:In the shell tool, delay opening the database until it is needed but also make sure it is opened before trying to use the "db" pointer. Ticket #302. (CVS 945)
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | trunk
Files: files | file ages | folders
SHA1: 20fcead42bc875f13eec52971530342ff00c5eda
User & Date: drh 2003-04-30 11:38:26
Context
2003-05-01
16:56
Correctly create an index that uses an INTEGER PRIMARY KEY as one of columns to be indexed. (CVS 946) check-in: 6d019e0b user: drh tags: trunk
2003-04-30
11:38
In the shell tool, delay opening the database until it is needed but also make sure it is opened before trying to use the "db" pointer. Ticket #302. (CVS 945) check-in: 20fcead4 user: drh tags: trunk
2003-04-29
18:01
Accept a "/" or "go" on a line by itself as an SQL statement terminator in the command-line shell. This allows SQL Server and Oracle scripts to be played into SQLite without change. (CVS 944) check-in: 8211f57b user: drh tags: trunk
Changes
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Changes to src/shell.c.

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**    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 "sqlite" command line
** utility for accessing SQLite databases.
**
** $Id: shell.c,v 1.74 2003/04/29 18:01:28 drh Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "sqlite.h"
#include <ctype.h>

................................................................................

/*
** Prompt strings. Initialized in main. Settable with
**   .prompt main continue
*/
static char mainPrompt[20];     /* First line prompt. default: "sqlite> "*/
static char continuePrompt[20]; /* Continuation prompt. default: "   ...> " */


/*
** Determines if a string is a number of not.
*/
extern int sqliteIsNumber(const char*);

/*
................................................................................
  int colWidth[100];     /* Requested width of each column when in column mode*/
  int actualWidth[100];  /* Actual width of each column */
  char nullvalue[20];    /* The text to print when a NULL comes back from
                         ** the database */
  struct previous_mode_data explainPrev;
                         /* Holds the mode information just before
                         ** .explain ON */
  char outfile[FILENAME_MAX];
                         /* Filename for *out */
};

/*
** These are the allowed modes.
*/
#define MODE_Line     0  /* One column per line.  Blank line between records */
#define MODE_Column   1  /* One record per line in neat columns */
................................................................................
  ".tables ?PATTERN?      List names of tables matching a pattern\n"
  ".timeout MS            Try opening locked tables for MS milliseconds\n"
  ".width NUM NUM ...     Set column widths for \"column\" mode\n"
;

/* Forward reference */
static void process_input(struct callback_data *p, FILE *in);


























/*
** If an input line begins with "." then invoke this routine to
** process that line.
**
** Return 1 to exit and 0 to continue.
*/
static int do_meta_command(char *zLine, sqlite *db, struct callback_data *p){
  int i = 1;
  int nArg = 0;
  int n, c;
  int rc = 0;
  char *azArg[50];

  /* Parse the input line into tokens.
................................................................................
  /* Process the input line.
  */
  if( nArg==0 ) return rc;
  n = strlen(azArg[0]);
  c = azArg[0][0];
  if( c=='d' && strncmp(azArg[0], "dump", n)==0 ){
    char *zErrMsg = 0;

    fprintf(p->out, "BEGIN TRANSACTION;\n");
    if( nArg==1 ){
      sqlite_exec(db,
        "SELECT name, type, sql FROM sqlite_master "
        "WHERE type!='meta' AND sql NOT NULL "
        "ORDER BY substr(type,2,1), name",
        dump_callback, p, &zErrMsg
      );
    }else{
      int i;
      for(i=1; i<nArg && zErrMsg==0; i++){
        sqlite_exec_printf(db,
          "SELECT name, type, sql FROM sqlite_master "
          "WHERE tbl_name LIKE '%q' AND type!='meta' AND sql NOT NULL "
          "ORDER BY substr(type,2,1), name",
          dump_callback, p, &zErrMsg, azArg[i]
        );
      }
    }
................................................................................
  if( c=='h' && strncmp(azArg[0], "help", n)==0 ){
    fprintf(stderr,zHelp);
  }else

  if( c=='i' && strncmp(azArg[0], "indices", n)==0 && nArg>1 ){
    struct callback_data data;
    char *zErrMsg = 0;

    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.mode = MODE_List;
    sqlite_exec_printf(db,
      "SELECT name FROM sqlite_master "
      "WHERE type='index' AND tbl_name LIKE '%q' "
      "UNION ALL "
      "SELECT name FROM sqlite_temp_master "
      "WHERE type='index' AND tbl_name LIKE '%q' "
      "ORDER BY 1",
      callback, &data, &zErrMsg, azArg[1], azArg[1]
................................................................................
    }
    if( nArg >= 3) {
      strncpy(continuePrompt,azArg[2],(int)ArraySize(continuePrompt)-1);
    }
  }else

  if( c=='q' && strncmp(azArg[0], "quit", n)==0 ){
    sqlite_close(db);
    exit(0);
  }else

  if( c=='r' && strncmp(azArg[0], "read", n)==0 && nArg==2 ){
    FILE *alt = fopen(azArg[1], "r");
    if( alt==0 ){
      fprintf(stderr,"can't open \"%s\"\n", azArg[1]);
................................................................................
      fclose(alt);
    }
  }else

  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
    struct callback_data data;
    char *zErrMsg = 0;

    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.mode = MODE_Semi;
    if( nArg>1 ){
      extern int sqliteStrICmp(const char*,const char*);
      if( sqliteStrICmp(azArg[1],"sqlite_master")==0 ){
        char *new_argv[2], *new_colv[2];
................................................................................
                      "  sql text\n"
                      ")";
        new_argv[1] = 0;
        new_colv[0] = "sql";
        new_colv[1] = 0;
        callback(&data, 1, new_argv, new_colv);
      }else{
        sqlite_exec_printf(db,
          "SELECT sql FROM "
          "  (SELECT * FROM sqlite_master UNION ALL"
          "   SELECT * FROM sqlite_temp_master) "
          "WHERE tbl_name LIKE '%q' AND type!='meta' AND sql NOTNULL "
          "ORDER BY substr(type,2,1), name",
          callback, &data, &zErrMsg, azArg[1]);
      }
    }else{
      sqlite_exec(db,
         "SELECT sql FROM "
         "  (SELECT * FROM sqlite_master UNION ALL"
         "   SELECT * FROM sqlite_temp_master) "
         "WHERE type!='meta' AND sql NOTNULL "
         "ORDER BY substr(type,2,1), name",
         callback, &data, &zErrMsg
      );
................................................................................
    fprintf(p->out,"\n\n");
  }else

  if( c=='t' && n>1 && strncmp(azArg[0], "tables", n)==0 ){
    char **azResult;
    int nRow, rc;
    char *zErrMsg;

    if( nArg==1 ){
      rc = sqlite_get_table(db,
        "SELECT name FROM sqlite_master "
        "WHERE type IN ('table','view') "
        "UNION ALL "
        "SELECT name FROM sqlite_temp_master "
        "WHERE type IN ('table','view') "
        "ORDER BY 1",
        &azResult, &nRow, 0, &zErrMsg
      );
    }else{
      rc = sqlite_get_table_printf(db,
        "SELECT name FROM sqlite_master "
        "WHERE type IN ('table','view') AND name LIKE '%%%q%%' "
        "UNION ALL "
        "SELECT name FROM sqlite_temp_master "
        "WHERE type IN ('table','view') AND name LIKE '%%%q%%' "
        "ORDER BY 1",
        &azResult, &nRow, 0, &zErrMsg, azArg[1], azArg[1]
................................................................................
        printf("\n");
      }
    }
    sqlite_free_table(azResult);
  }else

  if( c=='t' && n>1 && strncmp(azArg[0], "timeout", n)==0 && nArg>=2 ){

    sqlite_busy_timeout(db, atoi(azArg[1]));
  }else

  if( c=='w' && strncmp(azArg[0], "width", n)==0 ){
    int j;
    for(j=1; j<nArg && j<ArraySize(p->colWidth); j++){
      p->colWidth[j-1] = atoi(azArg[j]);
    }
................................................................................
    if( seenInterrupt ){
      if( in!=0 ) break;
      seenInterrupt = 0;
    }
    if( p->echoOn ) printf("%s\n", zLine);
    if( _all_whitespace(zLine) ) continue;
    if( zLine && zLine[0]=='.' && nSql==0 ){
      int rc = do_meta_command(zLine, db, p);
      free(zLine);
      if( rc ) break;
      continue;
    }
    if( _is_command_terminator(zLine) ){
      strcpy(zLine,";");
    }
................................................................................
      strcpy(&zSql[nSql++], "\n");
      strcpy(&zSql[nSql], zLine);
      nSql += len;
    }
    free(zLine);
    if( zSql && _ends_with_semicolon(zSql, nSql) && sqlite_complete(zSql) ){
      p->cnt = 0;

      rc = sqlite_exec(db, zSql, callback, p, &zErrMsg);
      if( rc || zErrMsg ){
        if( in!=0 && !p->echoOn ) printf("%s\n",zSql);
        if( zErrMsg!=0 ){
          printf("SQL error: %s\n", zErrMsg);
          free(zErrMsg);
          zErrMsg = 0;
        }else{
................................................................................
}

int main(int argc, char **argv){
  char *zErrMsg = 0;
  struct callback_data data;
  int origArgc = argc;
  char **origArgv = argv;



#ifdef __MACOS__
  argc = ccommand(&argv);
  origArgc = argc;
  origArgv = argv;
#endif

  Argv0 = argv[0];
  main_init(&data);
  process_sqliterc(&data,NULL);




#ifdef SIGINT
  signal(SIGINT, interrupt_handler);
#endif































  while( argc>=2 && argv[1][0]=='-' ){
    if( argc>=3 && strcmp(argv[1],"-init")==0 ){
      /* If we get a -init to do, we have to pretend that
      ** it replaced the .sqliterc file. Soooo, in order to
      ** do that we need to start from scratch...*/
      main_init(&data);

................................................................................
      argc--;
      argv++;
    }else{
      fprintf(stderr,"%s: unknown option: %s\n", Argv0, argv[1]);
      return 1;
    }
  }
  if( argc!=2 && argc!=3 ){
    fprintf(stderr,"Usage: %s ?OPTIONS? FILENAME ?SQL?\n", Argv0);
    exit(1);
  }
  data.db = db = sqlite_open(argv[1], 0666, &zErrMsg);
  if( db==0 ){
    data.db = db = sqlite_open(argv[1], 0444, &zErrMsg);
    if( db==0 ){
      if( zErrMsg ){
        fprintf(stderr,"Unable to open database \"%s\": %s\n", argv[1],zErrMsg);
      }else{
        fprintf(stderr,"Unable to open database %s\n", argv[1]);
      }
      exit(1);
    }else{
      fprintf(stderr,"Database \"%s\" opened READ ONLY!\n", argv[1]);
    }
  }
  data.out = stdout;
  if( argc==3 ){


    if( argv[2][0]=='.' ){
      do_meta_command(argv[2], db, &data);
      exit(0);
    }else{
      int rc;

      rc = sqlite_exec(db, argv[2], callback, &data, &zErrMsg);
      if( rc!=0 && zErrMsg!=0 ){
        fprintf(stderr,"SQL error: %s\n", zErrMsg);
        exit(1);
      }
    }
  }else{


    if( isatty(fileno(stdout)) && isatty(fileno(stdin)) ){
      char *zHome;
      char *zHistory = 0;
      printf(
        "SQLite version %s\n"
        "Enter \".help\" for instructions\n",
        sqlite_version
................................................................................
        write_history(zHistory);
      }
    }else{
      process_input(&data, stdin);
    }
  }
  set_table_name(&data, 0);
  sqlite_close(db);
  return 0;
}







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**    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 "sqlite" command line
** utility for accessing SQLite databases.
**
** $Id: shell.c,v 1.75 2003/04/30 11:38:26 drh Exp $
*/
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "sqlite.h"
#include <ctype.h>

................................................................................

/*
** Prompt strings. Initialized in main. Settable with
**   .prompt main continue
*/
static char mainPrompt[20];     /* First line prompt. default: "sqlite> "*/
static char continuePrompt[20]; /* Continuation prompt. default: "   ...> " */


/*
** Determines if a string is a number of not.
*/
extern int sqliteIsNumber(const char*);

/*
................................................................................
  int colWidth[100];     /* Requested width of each column when in column mode*/
  int actualWidth[100];  /* Actual width of each column */
  char nullvalue[20];    /* The text to print when a NULL comes back from
                         ** the database */
  struct previous_mode_data explainPrev;
                         /* Holds the mode information just before
                         ** .explain ON */
  char outfile[FILENAME_MAX]; /* Filename for *out */
  const char *zDbFilename;    /* name of the database file */
};

/*
** These are the allowed modes.
*/
#define MODE_Line     0  /* One column per line.  Blank line between records */
#define MODE_Column   1  /* One record per line in neat columns */
................................................................................
  ".tables ?PATTERN?      List names of tables matching a pattern\n"
  ".timeout MS            Try opening locked tables for MS milliseconds\n"
  ".width NUM NUM ...     Set column widths for \"column\" mode\n"
;

/* Forward reference */
static void process_input(struct callback_data *p, FILE *in);

/*
** Make sure the database is open.  If it is not, then open it.  If
** the database fails to open, print an error message and exit.
*/
static void open_db(struct callback_data *p){
  if( p->db==0 ){
    char *zErrMsg = 0;
    p->db = db = sqlite_open(p->zDbFilename, 0666, &zErrMsg);
    if( db==0 ){
      p->db = db = sqlite_open(p->zDbFilename, 0444, &zErrMsg);
      if( db==0 ){
        if( zErrMsg ){
          fprintf(stderr,"Unable to open database \"%s\": %s\n", 
             p->zDbFilename, zErrMsg);
        }else{
          fprintf(stderr,"Unable to open database %s\n", p->zDbFilename);
        }
        exit(1);
      }else{
        fprintf(stderr,"Database \"%s\" opened READ ONLY!\n", p->zDbFilename);
      }
    }
  }
}

/*
** If an input line begins with "." then invoke this routine to
** process that line.
**
** Return 1 to exit and 0 to continue.
*/
static int do_meta_command(char *zLine, struct callback_data *p){
  int i = 1;
  int nArg = 0;
  int n, c;
  int rc = 0;
  char *azArg[50];

  /* Parse the input line into tokens.
................................................................................
  /* Process the input line.
  */
  if( nArg==0 ) return rc;
  n = strlen(azArg[0]);
  c = azArg[0][0];
  if( c=='d' && strncmp(azArg[0], "dump", n)==0 ){
    char *zErrMsg = 0;
    open_db(p);
    fprintf(p->out, "BEGIN TRANSACTION;\n");
    if( nArg==1 ){
      sqlite_exec(p->db,
        "SELECT name, type, sql FROM sqlite_master "
        "WHERE type!='meta' AND sql NOT NULL "
        "ORDER BY substr(type,2,1), name",
        dump_callback, p, &zErrMsg
      );
    }else{
      int i;
      for(i=1; i<nArg && zErrMsg==0; i++){
        sqlite_exec_printf(p->db,
          "SELECT name, type, sql FROM sqlite_master "
          "WHERE tbl_name LIKE '%q' AND type!='meta' AND sql NOT NULL "
          "ORDER BY substr(type,2,1), name",
          dump_callback, p, &zErrMsg, azArg[i]
        );
      }
    }
................................................................................
  if( c=='h' && strncmp(azArg[0], "help", n)==0 ){
    fprintf(stderr,zHelp);
  }else

  if( c=='i' && strncmp(azArg[0], "indices", n)==0 && nArg>1 ){
    struct callback_data data;
    char *zErrMsg = 0;
    open_db(p);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.mode = MODE_List;
    sqlite_exec_printf(p->db,
      "SELECT name FROM sqlite_master "
      "WHERE type='index' AND tbl_name LIKE '%q' "
      "UNION ALL "
      "SELECT name FROM sqlite_temp_master "
      "WHERE type='index' AND tbl_name LIKE '%q' "
      "ORDER BY 1",
      callback, &data, &zErrMsg, azArg[1], azArg[1]
................................................................................
    }
    if( nArg >= 3) {
      strncpy(continuePrompt,azArg[2],(int)ArraySize(continuePrompt)-1);
    }
  }else

  if( c=='q' && strncmp(azArg[0], "quit", n)==0 ){
    sqlite_close(p->db);
    exit(0);
  }else

  if( c=='r' && strncmp(azArg[0], "read", n)==0 && nArg==2 ){
    FILE *alt = fopen(azArg[1], "r");
    if( alt==0 ){
      fprintf(stderr,"can't open \"%s\"\n", azArg[1]);
................................................................................
      fclose(alt);
    }
  }else

  if( c=='s' && strncmp(azArg[0], "schema", n)==0 ){
    struct callback_data data;
    char *zErrMsg = 0;
    open_db(p);
    memcpy(&data, p, sizeof(data));
    data.showHeader = 0;
    data.mode = MODE_Semi;
    if( nArg>1 ){
      extern int sqliteStrICmp(const char*,const char*);
      if( sqliteStrICmp(azArg[1],"sqlite_master")==0 ){
        char *new_argv[2], *new_colv[2];
................................................................................
                      "  sql text\n"
                      ")";
        new_argv[1] = 0;
        new_colv[0] = "sql";
        new_colv[1] = 0;
        callback(&data, 1, new_argv, new_colv);
      }else{
        sqlite_exec_printf(p->db,
          "SELECT sql FROM "
          "  (SELECT * FROM sqlite_master UNION ALL"
          "   SELECT * FROM sqlite_temp_master) "
          "WHERE tbl_name LIKE '%q' AND type!='meta' AND sql NOTNULL "
          "ORDER BY substr(type,2,1), name",
          callback, &data, &zErrMsg, azArg[1]);
      }
    }else{
      sqlite_exec(p->db,
         "SELECT sql FROM "
         "  (SELECT * FROM sqlite_master UNION ALL"
         "   SELECT * FROM sqlite_temp_master) "
         "WHERE type!='meta' AND sql NOTNULL "
         "ORDER BY substr(type,2,1), name",
         callback, &data, &zErrMsg
      );
................................................................................
    fprintf(p->out,"\n\n");
  }else

  if( c=='t' && n>1 && strncmp(azArg[0], "tables", n)==0 ){
    char **azResult;
    int nRow, rc;
    char *zErrMsg;
    open_db(p);
    if( nArg==1 ){
      rc = sqlite_get_table(p->db,
        "SELECT name FROM sqlite_master "
        "WHERE type IN ('table','view') "
        "UNION ALL "
        "SELECT name FROM sqlite_temp_master "
        "WHERE type IN ('table','view') "
        "ORDER BY 1",
        &azResult, &nRow, 0, &zErrMsg
      );
    }else{
      rc = sqlite_get_table_printf(p->db,
        "SELECT name FROM sqlite_master "
        "WHERE type IN ('table','view') AND name LIKE '%%%q%%' "
        "UNION ALL "
        "SELECT name FROM sqlite_temp_master "
        "WHERE type IN ('table','view') AND name LIKE '%%%q%%' "
        "ORDER BY 1",
        &azResult, &nRow, 0, &zErrMsg, azArg[1], azArg[1]
................................................................................
        printf("\n");
      }
    }
    sqlite_free_table(azResult);
  }else

  if( c=='t' && n>1 && strncmp(azArg[0], "timeout", n)==0 && nArg>=2 ){
    open_db(p);
    sqlite_busy_timeout(p->db, atoi(azArg[1]));
  }else

  if( c=='w' && strncmp(azArg[0], "width", n)==0 ){
    int j;
    for(j=1; j<nArg && j<ArraySize(p->colWidth); j++){
      p->colWidth[j-1] = atoi(azArg[j]);
    }
................................................................................
    if( seenInterrupt ){
      if( in!=0 ) break;
      seenInterrupt = 0;
    }
    if( p->echoOn ) printf("%s\n", zLine);
    if( _all_whitespace(zLine) ) continue;
    if( zLine && zLine[0]=='.' && nSql==0 ){
      int rc = do_meta_command(zLine, p);
      free(zLine);
      if( rc ) break;
      continue;
    }
    if( _is_command_terminator(zLine) ){
      strcpy(zLine,";");
    }
................................................................................
      strcpy(&zSql[nSql++], "\n");
      strcpy(&zSql[nSql], zLine);
      nSql += len;
    }
    free(zLine);
    if( zSql && _ends_with_semicolon(zSql, nSql) && sqlite_complete(zSql) ){
      p->cnt = 0;
      open_db(p);
      rc = sqlite_exec(p->db, zSql, callback, p, &zErrMsg);
      if( rc || zErrMsg ){
        if( in!=0 && !p->echoOn ) printf("%s\n",zSql);
        if( zErrMsg!=0 ){
          printf("SQL error: %s\n", zErrMsg);
          free(zErrMsg);
          zErrMsg = 0;
        }else{
................................................................................
}

int main(int argc, char **argv){
  char *zErrMsg = 0;
  struct callback_data data;
  int origArgc = argc;
  char **origArgv = argv;
  int i;
  extern int sqliteOsFileExists(const char*);

#ifdef __MACOS__
  argc = ccommand(&argv);
  origArgc = argc;
  origArgv = argv;
#endif

  Argv0 = argv[0];
  main_init(&data);


  /* Make sure we have a valid signal handler early, before anything
  ** else is done.
  */
#ifdef SIGINT
  signal(SIGINT, interrupt_handler);
#endif

  /* Locate the name of the database file
  */
  for(i=1; i<argc; i++){
    if( argv[i][0]!='-' ) break;
    if( strcmp(argv[i],"-separator")==0 || strcmp(argv[i],"-nullvalue")==0 ){
      i++;
    }
  }
  if( i!=argc-1 && i!=argc-2 ){
    fprintf(stderr,"Usage: %s ?OPTIONS? FILENAME ?SQL?\n", Argv0);
    exit(1);
  }
  data.zDbFilename = argv[i];
  data.out = stdout;

  /* Go ahead and open the database file if it already exists.  If the
  ** file does not exist, delay opening it.  This prevents empty database
  ** files from being created if a user mistypes the database name argument
  ** to the sqlite command-line tool.
  */
  if( sqliteOsFileExists(data.zDbFilename) ){
    open_db(&data);
  }

  /* Process the ~/.sqliterc file, if there is one
  */
  process_sqliterc(&data,NULL);

  /* Process command-line options
  */
  while( argc>=2 && argv[1][0]=='-' ){
    if( argc>=3 && strcmp(argv[1],"-init")==0 ){
      /* If we get a -init to do, we have to pretend that
      ** it replaced the .sqliterc file. Soooo, in order to
      ** do that we need to start from scratch...*/
      main_init(&data);

................................................................................
      argc--;
      argv++;
    }else{
      fprintf(stderr,"%s: unknown option: %s\n", Argv0, argv[1]);
      return 1;
    }
  }



















  if( argc==3 ){
    /* Run just the command that follows the database name
    */
    if( argv[2][0]=='.' ){
      do_meta_command(argv[2], &data);
      exit(0);
    }else{
      int rc;
      open_db(&data);
      rc = sqlite_exec(db, argv[2], callback, &data, &zErrMsg);
      if( rc!=0 && zErrMsg!=0 ){
        fprintf(stderr,"SQL error: %s\n", zErrMsg);
        exit(1);
      }
    }
  }else{
    /* Run commands received from standard input
    */
    if( isatty(fileno(stdout)) && isatty(fileno(stdin)) ){
      char *zHome;
      char *zHistory = 0;
      printf(
        "SQLite version %s\n"
        "Enter \".help\" for instructions\n",
        sqlite_version
................................................................................
        write_history(zHistory);
      }
    }else{
      process_input(&data, stdin);
    }
  }
  set_table_name(&data, 0);
  if( db ) sqlite_close(db);
  return 0;
}