greenplumn oid2name 源码
greenplumn oid2name 代码
文件路径：/contrib/oid2name/oid2name.c
/*
* oid2name, a PostgreSQL app to map OIDs on the filesystem
* to table and database names.
*
* Originally by
* B. Palmer, bpalmer@crimelabs.net 1-17-2001
*
* contrib/oid2name/oid2name.c
*/
#include "postgres_fe.h"
#include "catalog/pg_class_d.h"
#include "fe_utils/connect.h"
#include "libpq-fe.h"
#include "pg_getopt.h"
#include "getopt_long.h"
/* an extensible array to keep track of elements to show */
typedef struct
{
char **array;
int num;
int alloc;
} eary;
/* these are the opts structures for command line params */
struct options
{
eary *tables;
eary *oids;
eary *filenodes;
bool quiet;
bool systables;
bool indexes;
bool nodb;
bool extended;
bool tablespaces;
char *dbname;
char *hostname;
char *port;
char *username;
const char *progname;
};
/* function prototypes */
static void help(const char *progname);
void get_opts(int, char **, struct options *);
void add_one_elt(char *eltname, eary *eary);
char *get_comma_elts(eary *eary);
PGconn *sql_conn(struct options *);
int sql_exec(PGconn *, const char *sql, bool quiet);
void sql_exec_dumpalldbs(PGconn *, struct options *);
void sql_exec_dumpalltables(PGconn *, struct options *);
void sql_exec_searchtables(PGconn *, struct options *);
void sql_exec_dumpalltbspc(PGconn *, struct options *);
/* function to parse command line options and check for some usage errors. */
void
get_opts(int argc, char **argv, struct options *my_opts)
{
static struct option long_options[] = {
{"dbname", required_argument, NULL, 'd'},
{"host", required_argument, NULL, 'h'},
{"host", required_argument, NULL, 'H'}, /* deprecated */
{"filenode", required_argument, NULL, 'f'},
{"indexes", no_argument, NULL, 'i'},
{"oid", required_argument, NULL, 'o'},
{"port", required_argument, NULL, 'p'},
{"quiet", no_argument, NULL, 'q'},
{"tablespaces", no_argument, NULL, 's'},
{"system-objects", no_argument, NULL, 'S'},
{"table", required_argument, NULL, 't'},
{"username", required_argument, NULL, 'U'},
{"version", no_argument, NULL, 'V'},
{"extended", no_argument, NULL, 'x'},
{"help", no_argument, NULL, '?'},
{NULL, 0, NULL, 0}
};
int c;
const char *progname;
int optindex;
progname = get_progname(argv[0]);
/* set the defaults */
my_opts->quiet = false;
my_opts->systables = false;
my_opts->indexes = false;
my_opts->nodb = false;
my_opts->extended = false;
my_opts->tablespaces = false;
my_opts->dbname = NULL;
my_opts->hostname = NULL;
my_opts->port = NULL;
my_opts->username = NULL;
my_opts->progname = progname;
if (argc > 1)
{
if (strcmp(argv[1], "--help") == 0 || strcmp(argv[1], "-?") == 0)
{
help(progname);
exit(0);
}
if (strcmp(argv[1], "--version") == 0 || strcmp(argv[1], "-V") == 0)
{
puts("oid2name (PostgreSQL) " PG_VERSION);
exit(0);
}
}
/* get opts */
while ((c = getopt_long(argc, argv, "d:f:h:H:io:p:qsSt:U:x", long_options, &optindex)) != -1)
{
switch (c)
{
/* specify the database */
case 'd':
my_opts->dbname = pg_strdup(optarg);
break;
/* specify one filenode to show */
case 'f':
add_one_elt(optarg, my_opts->filenodes);
break;
/* host to connect to */
case 'H': /* deprecated */
case 'h':
my_opts->hostname = pg_strdup(optarg);
break;
/* also display indexes */
case 'i':
my_opts->indexes = true;
break;
/* specify one Oid to show */
case 'o':
add_one_elt(optarg, my_opts->oids);
break;
/* port to connect to on remote host */
case 'p':
my_opts->port = pg_strdup(optarg);
break;
/* don't show headers */
case 'q':
my_opts->quiet = true;
break;
/* dump tablespaces only */
case 's':
my_opts->tablespaces = true;
break;
/* display system tables */
case 'S':
my_opts->systables = true;
break;
/* specify one tablename to show */
case 't':
add_one_elt(optarg, my_opts->tables);
break;
/* username */
case 'U':
my_opts->username = pg_strdup(optarg);
break;
/* display extra columns */
case 'x':
my_opts->extended = true;
break;
default:
fprintf(stderr, _("Try \"%s --help\" for more information.\n"), progname);
exit(1);
}
}
}
static void
help(const char *progname)
{
printf("%s helps examining the file structure used by PostgreSQL.\n\n"
"Usage:\n"
" %s [OPTION]...\n"
"\nOptions:\n"
" -f, --filenode=FILENODE show info for table with given file node\n"
" -i, --indexes show indexes and sequences too\n"
" -o, --oid=OID show info for table with given OID\n"
" -q, --quiet quiet (don't show headers)\n"
" -s, --tablespaces show all tablespaces\n"
" -S, --system-objects show system objects too\n"
" -t, --table=TABLE show info for named table\n"
" -V, --version output version information, then exit\n"
" -x, --extended extended (show additional columns)\n"
" -?, --help show this help, then exit\n"
"\nConnection options:\n"
" -d, --dbname=DBNAME database to connect to\n"
" -h, --host=HOSTNAME database server host or socket directory\n"
" -H same as -h, deprecated option\n"
" -p, --port=PORT database server port number\n"
" -U, --username=USERNAME connect as specified database user\n"
"\nThe default action is to show all database OIDs.\n\n"
"Report bugs to <pgsql-bugs@lists.postgresql.org>.\n",
progname, progname);
}
/*
* add_one_elt
*
* Add one element to a (possibly empty) eary struct.
*/
void
add_one_elt(char *eltname, eary *eary)
{
if (eary->alloc == 0)
{
eary ->alloc = 8;
eary ->array = (char **) pg_malloc(8 * sizeof(char *));
}
else if (eary->num >= eary->alloc)
{
eary ->alloc *= 2;
eary ->array = (char **) pg_realloc(eary->array,
eary->alloc * sizeof(char *));
}
eary ->array[eary->num] = pg_strdup(eltname);
eary ->num++;
}
/*
* get_comma_elts
*
* Return the elements of an eary as a (freshly allocated) single string, in
* single quotes, separated by commas and properly escaped for insertion in an
* SQL statement.
*/
char *
get_comma_elts(eary *eary)
{
char *ret,
*ptr;
int i,
length = 0;
if (eary->num == 0)
return pg_strdup("");
/*
* PQescapeString wants 2 * length + 1 bytes of breath space. Add two
* chars per element for the single quotes and one for the comma.
*/
for (i = 0; i < eary->num; i++)
length += strlen(eary->array[i]);
ret = (char *) pg_malloc(length * 2 + 4 * eary->num);
ptr = ret;
for (i = 0; i < eary->num; i++)
{
if (i != 0)
sprintf(ptr++, ",");
sprintf(ptr++, "'");
ptr += PQescapeString(ptr, eary->array[i], strlen(eary->array[i]));
sprintf(ptr++, "'");
}
return ret;
}
/* establish connection with database. */
PGconn *
sql_conn(struct options *my_opts)
{
PGconn *conn;
bool have_password = false;
char password[100];
bool new_pass;
PGresult *res;
/*
* Start the connection. Loop until we have a password if requested by
* backend.
*/
do
{
#define PARAMS_ARRAY_SIZE 7
const char *keywords[PARAMS_ARRAY_SIZE];
const char *values[PARAMS_ARRAY_SIZE];
keywords[0] = "host";
values[0] = my_opts->hostname;
keywords[1] = "port";
values[1] = my_opts->port;
keywords[2] = "user";
values[2] = my_opts->username;
keywords[3] = "password";
values[3] = have_password ? password : NULL;
keywords[4] = "dbname";
values[4] = my_opts->dbname;
keywords[5] = "fallback_application_name";
values[5] = my_opts->progname;
keywords[6] = NULL;
values[6] = NULL;
new_pass = false;
conn = PQconnectdbParams(keywords, values, true);
if (!conn)
{
fprintf(stderr, "%s: could not connect to database %s\n",
"oid2name", my_opts->dbname);
exit(1);
}
if (PQstatus(conn) == CONNECTION_BAD &&
PQconnectionNeedsPassword(conn) &&
!have_password)
{
PQfinish(conn);
simple_prompt("Password: ", password, sizeof(password), false);
have_password = true;
new_pass = true;
}
} while (new_pass);
/* check to see that the backend connection was successfully made */
if (PQstatus(conn) == CONNECTION_BAD)
{
fprintf(stderr, "%s: could not connect to database %s: %s",
"oid2name", my_opts->dbname, PQerrorMessage(conn));
PQfinish(conn);
exit(1);
}
res = PQexec(conn, ALWAYS_SECURE_SEARCH_PATH_SQL);
if (PQresultStatus(res) != PGRES_TUPLES_OK)
{
fprintf(stderr, "oid2name: could not clear search_path: %s\n",
PQerrorMessage(conn));
PQclear(res);
PQfinish(conn);
exit(-1);
}
PQclear(res);
/* return the conn if good */
return conn;
}
/*
* Actual code to make call to the database and print the output data.
*/
int
sql_exec(PGconn *conn, const char *todo, bool quiet)
{
PGresult *res;
int nfields;
int nrows;
int i,
j,
l;
int *length;
char *pad;
/* make the call */
res = PQexec(conn, todo);
/* check and deal with errors */
if (!res || PQresultStatus(res) > 2)
{
fprintf(stderr, "oid2name: query failed: %s\n", PQerrorMessage(conn));
fprintf(stderr, "oid2name: query was: %s\n", todo);
PQclear(res);
PQfinish(conn);
exit(-1);
}
/* get the number of fields */
nrows = PQntuples(res);
nfields = PQnfields(res);
/* for each field, get the needed width */
length = (int *) pg_malloc(sizeof(int) * nfields);
for (j = 0; j < nfields; j++)
length[j] = strlen(PQfname(res, j));
for (i = 0; i < nrows; i++)
{
for (j = 0; j < nfields; j++)
{
l = strlen(PQgetvalue(res, i, j));
if (l > length[j])
length[j] = strlen(PQgetvalue(res, i, j));
}
}
/* print a header */
if (!quiet)
{
for (j = 0, l = 0; j < nfields; j++)
{
fprintf(stdout, "%*s", length[j] + 2, PQfname(res, j));
l += length[j] + 2;
}
fprintf(stdout, "\n");
pad = (char *) pg_malloc(l + 1);
MemSet(pad, '-', l);
pad[l] = '\0';
fprintf(stdout, "%s\n", pad);
free(pad);
}
/* for each row, dump the information */
for (i = 0; i < nrows; i++)
{
for (j = 0; j < nfields; j++)
fprintf(stdout, "%*s", length[j] + 2, PQgetvalue(res, i, j));
fprintf(stdout, "\n");
}
/* cleanup */
PQclear(res);
free(length);
return 0;
}
/*
* Dump all databases. There are no system objects to worry about.
*/
void
sql_exec_dumpalldbs(PGconn *conn, struct options *opts)
{
char todo[1024];
/* get the oid and database name from the system pg_database table */
snprintf(todo, sizeof(todo),
"SELECT d.oid AS \"Oid\", datname AS \"Database Name\", "
"spcname AS \"Tablespace\" FROM pg_catalog.pg_database d JOIN pg_catalog.pg_tablespace t ON "
"(dattablespace = t.oid) ORDER BY 2");
sql_exec(conn, todo, opts->quiet);
}
/*
* Dump all tables, indexes and sequences in the current database.
*/
void
sql_exec_dumpalltables(PGconn *conn, struct options *opts)
{
char todo[1024];
char *addfields = ",c.oid AS \"Oid\", nspname AS \"Schema\", spcname as \"Tablespace\" ";
snprintf(todo, sizeof(todo),
"SELECT pg_catalog.pg_relation_filenode(c.oid) as \"Filenode\", relname as \"Table Name\" %s "
"FROM pg_catalog.pg_class c "
" LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace "
" LEFT JOIN pg_catalog.pg_database d ON d.datname = pg_catalog.current_database(),"
" pg_catalog.pg_tablespace t "
"WHERE relkind IN (" CppAsString2(RELKIND_RELATION) ","
CppAsString2(RELKIND_MATVIEW) "%s%s) AND "
" %s"
" t.oid = CASE"
" WHEN reltablespace <> 0 THEN reltablespace"
" ELSE dattablespace"
" END "
"ORDER BY relname",
opts->extended ? addfields : "",
opts->indexes ? "," CppAsString2(RELKIND_INDEX) "," CppAsString2(RELKIND_SEQUENCE) : "",
opts->systables ? "," CppAsString2(RELKIND_TOASTVALUE) : "",
opts->systables ? "" : "n.nspname NOT IN ('pg_catalog', 'information_schema') AND n.nspname !~ '^pg_toast' AND");
sql_exec(conn, todo, opts->quiet);
}
/*
* Show oid, filenode, name, schema and tablespace for each of the
* given objects in the current database.
*/
void
sql_exec_searchtables(PGconn *conn, struct options *opts)
{
char *todo;
char *qualifiers,
*ptr;
char *comma_oids,
*comma_filenodes,
*comma_tables;
bool written = false;
char *addfields = ",c.oid AS \"Oid\", nspname AS \"Schema\", spcname as \"Tablespace\" ";
/* get tables qualifiers, whether names, filenodes, or OIDs */
comma_oids = get_comma_elts(opts->oids);
comma_tables = get_comma_elts(opts->tables);
comma_filenodes = get_comma_elts(opts->filenodes);
/* 80 extra chars for SQL expression */
qualifiers = (char *) pg_malloc(strlen(comma_oids) + strlen(comma_tables) +
strlen(comma_filenodes) + 80);
ptr = qualifiers;
if (opts->oids->num > 0)
{
ptr += sprintf(ptr, "c.oid IN (%s)", comma_oids);
written = true;
}
if (opts->filenodes->num > 0)
{
if (written)
ptr += sprintf(ptr, " OR ");
ptr += sprintf(ptr, "pg_catalog.pg_relation_filenode(c.oid) IN (%s)", comma_filenodes);
written = true;
}
if (opts->tables->num > 0)
{
if (written)
ptr += sprintf(ptr, " OR ");
sprintf(ptr, "c.relname ~~ ANY (ARRAY[%s])", comma_tables);
}
free(comma_oids);
free(comma_tables);
free(comma_filenodes);
/* now build the query */
todo = psprintf(
"SELECT pg_catalog.pg_relation_filenode(c.oid) as \"Filenode\", relname as \"Table Name\" %s\n"
"FROM pg_catalog.pg_class c\n"
" LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace\n"
" LEFT JOIN pg_catalog.pg_database d ON d.datname = pg_catalog.current_database(),\n"
" pg_catalog.pg_tablespace t\n"
"WHERE relkind IN (" CppAsString2(RELKIND_RELATION) ","
CppAsString2(RELKIND_MATVIEW) ","
CppAsString2(RELKIND_INDEX) ","
CppAsString2(RELKIND_SEQUENCE) ","
CppAsString2(RELKIND_TOASTVALUE) ") AND\n"
" t.oid = CASE\n"
" WHEN reltablespace <> 0 THEN reltablespace\n"
" ELSE dattablespace\n"
" END AND\n"
" (%s)\n"
"ORDER BY relname\n",
opts->extended ? addfields : "",
qualifiers);
free(qualifiers);
sql_exec(conn, todo, opts->quiet);
}
void
sql_exec_dumpalltbspc(PGconn *conn, struct options *opts)
{
char todo[1024];
snprintf(todo, sizeof(todo),
"SELECT oid AS \"Oid\", spcname as \"Tablespace Name\"\n"
"FROM pg_catalog.pg_tablespace");
sql_exec(conn, todo, opts->quiet);
}
int
main(int argc, char **argv)
{
struct options *my_opts;
PGconn *pgconn;
my_opts = (struct options *) pg_malloc(sizeof(struct options));
my_opts->oids = (eary *) pg_malloc(sizeof(eary));
my_opts->tables = (eary *) pg_malloc(sizeof(eary));
my_opts->filenodes = (eary *) pg_malloc(sizeof(eary));
my_opts->oids->num = my_opts->oids->alloc = 0;
my_opts->tables->num = my_opts->tables->alloc = 0;
my_opts->filenodes->num = my_opts->filenodes->alloc = 0;
/* parse the opts */
get_opts(argc, argv, my_opts);
if (my_opts->dbname == NULL)
{
my_opts->dbname = "postgres";
my_opts->nodb = true;
}
pgconn = sql_conn(my_opts);
/* display only tablespaces */
if (my_opts->tablespaces)
{
if (!my_opts->quiet)
printf("All tablespaces:\n");
sql_exec_dumpalltbspc(pgconn, my_opts);
PQfinish(pgconn);
exit(0);
}
/* display the given elements in the database */
if (my_opts->oids->num > 0 ||
my_opts->tables->num > 0 ||
my_opts->filenodes->num > 0)
{
if (!my_opts->quiet)
printf("From database \"%s\":\n", my_opts->dbname);
sql_exec_searchtables(pgconn, my_opts);
PQfinish(pgconn);
exit(0);
}
/* no elements given; dump the given database */
if (my_opts->dbname && !my_opts->nodb)
{
if (!my_opts->quiet)
printf("From database \"%s\":\n", my_opts->dbname);
sql_exec_dumpalltables(pgconn, my_opts);
PQfinish(pgconn);
exit(0);
}
/* no database either; dump all databases */
if (!my_opts->quiet)
printf("All databases:\n");
sql_exec_dumpalldbs(pgconn, my_opts);
PQfinish(pgconn);
return 0;
}
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