str
SQLinitClient(Client c)
{
mvc *m;
str schema;
str msg = MAL_SUCCEED;
backend *be;
bstream *bfd = NULL;
stream *fd = NULL;
static int maybeupgrade = 1;
#ifdef _SQL_SCENARIO_DEBUG
mnstr_printf(GDKout, "#SQLinitClient\n");
#endif
if (SQLinitialized == 0 && (msg = SQLprelude(NULL)) != MAL_SUCCEED)
return msg;
MT_lock_set(&sql_contextLock);
/*
* Based on the initialization return value we can prepare a SQLinit
* string with all information needed to initialize the catalog
* based on the mandatory scripts to be executed.
*/
if (sqlinit) { /* add sqlinit to the fdin stack */
buffer *b = (buffer *) GDKmalloc(sizeof(buffer));
size_t len = strlen(sqlinit);
bstream *fdin;
buffer_init(b, _STRDUP(sqlinit), len);
fdin = bstream_create(buffer_rastream(b, "si"), b->len);
bstream_next(fdin);
MCpushClientInput(c, fdin, 0, "");
}
if (c->sqlcontext == 0) {
m = mvc_create(c->idx, 0, SQLdebug, c->fdin, c->fdout);
global_variables(m, "monetdb", "sys");
if (isAdministrator(c) || strcmp(c->scenario, "msql") == 0) /* console should return everything */
m->reply_size = -1;
be = (void *) backend_create(m, c);
} else {
be = c->sqlcontext;
m = be->mvc;
mvc_reset(m, c->fdin, c->fdout, SQLdebug, NR_GLOBAL_VARS);
backend_reset(be);
}
if (m->session->tr)
reset_functions(m->session->tr);
/* pass through credentials of the user if not console */
schema = monet5_user_set_def_schema(m, c->user);
if (!schema) {
_DELETE(schema);
throw(PERMD, "SQLinitClient", "08004!schema authorization error");
}
_DELETE(schema);
/*expect SQL text first */
be->language = 'S';
/* Set state, this indicates an initialized client scenario */
c->state[MAL_SCENARIO_READER] = c;
c->state[MAL_SCENARIO_PARSER] = c;
c->state[MAL_SCENARIO_OPTIMIZE] = c;
c->sqlcontext = be;
initSQLreferences();
/* initialize the database with predefined SQL functions */
if (SQLnewcatalog == 0) {
/* check whether table sys.systemfunctions exists: if
* it doesn't, this is probably a restart of the
* server after an incomplete initialization */
sql_schema *s = mvc_bind_schema(m, "sys");
sql_table *t = s ? mvc_bind_table(m, s, "systemfunctions") : NULL;
if (t == NULL)
SQLnewcatalog = 1;
}
if (SQLnewcatalog > 0) {
char path[PATHLENGTH];
str fullname;
SQLnewcatalog = 0;
maybeupgrade = 0;
snprintf(path, PATHLENGTH, "createdb");
slash_2_dir_sep(path);
fullname = MSP_locate_sqlscript(path, 1);
if (fullname) {
str filename = fullname;
str p, n;
fprintf(stdout, "# SQL catalog created, loading sql scripts once\n");
do {
p = strchr(filename, PATH_SEP);
if (p)
*p = '\0';
if ((n = strrchr(filename, DIR_SEP)) == NULL) {
n = filename;
} else {
n++;
}
fprintf(stdout, "# loading sql script: %s\n", n);
fd = open_rastream(filename);
if (p)
filename = p + 1;
if (fd) {
size_t sz;
sz = getFileSize(fd);
if (sz > (size_t) 1 << 29) {
mnstr_destroy(fd);
msg = createException(MAL, "createdb", "file %s too large to process", filename);
} else {
bfd = bstream_create(fd, sz == 0 ? (size_t) (128 * BLOCK) : sz);
if (bfd && bstream_next(bfd) >= 0)
msg = SQLstatementIntern(c, &bfd->buf, "sql.init", TRUE, FALSE, NULL);
bstream_destroy(bfd);
}
if (m->sa)
sa_destroy(m->sa);
m->sa = NULL;
if (msg)
p = NULL;
}
} while (p);
GDKfree(fullname);
} else
fprintf(stderr, "!could not read createdb.sql\n");
} else { /* handle upgrades */
if (!m->sa)
m->sa = sa_create();
if (maybeupgrade)
SQLupgrades(c,m);
maybeupgrade = 0;
}
MT_lock_unset(&sql_contextLock);
fflush(stdout);
fflush(stderr);
/* send error from create scripts back to the first client */
if (msg) {
error(c->fdout, msg);
handle_error(m, c->fdout, 0);
sqlcleanup(m, mvc_status(m));
}
return msg;
}
/*
* BEWARE: SQLstatementIntern only commits after all statements found
* in expr are executed, when autocommit mode is enabled.
*
* The tricky part for this statement is to ensure that the SQL statement
* is executed within the client context specified. This leads to context juggling.
*/
str
SQLstatementIntern(Client c, str *expr, str nme, int execute, bit output, res_table **result)
{
int status = 0;
int err = 0;
mvc *o, *m;
int ac, sizevars, topvars;
sql_var *vars;
int oldvtop, oldstop = 1;
buffer *b;
char *n;
stream *buf;
str msg = MAL_SUCCEED;
backend *be, *sql = (backend *) c->sqlcontext;
size_t len = strlen(*expr);
#ifdef _SQL_COMPILE
mnstr_printf(c->fdout, "#SQLstatement:%s\n", *expr);
#endif
if (!sql) {
msg = SQLinitEnvironment(c, NULL, NULL, NULL);
sql = (backend *) c->sqlcontext;
}
if (msg){
GDKfree(msg);
throw(SQL, "SQLstatement", "Catalogue not available");
}
initSQLreferences();
m = sql->mvc;
ac = m->session->auto_commit;
o = MNEW(mvc);
if (!o)
throw(SQL, "SQLstatement", "Out of memory");
*o = *m;
/* create private allocator */
m->sa = NULL;
SQLtrans(m);
status = m->session->status;
m->type = Q_PARSE;
be = sql;
sql = backend_create(m, c);
sql->output_format = be->output_format;
m->qc = NULL;
m->caching = 0;
m->user_id = m->role_id = USER_MONETDB;
if (result)
m->reply_size = -2; /* do not cleanup, result tables */
/* mimick a client channel on which the query text is received */
b = (buffer *) GDKmalloc(sizeof(buffer));
n = GDKmalloc(len + 1 + 1);
strncpy(n, *expr, len);
n[len] = '\n';
n[len + 1] = 0;
len++;
buffer_init(b, n, len);
buf = buffer_rastream(b, "sqlstatement");
scanner_init(&m->scanner, bstream_create(buf, b->len), NULL);
m->scanner.mode = LINE_N;
bstream_next(m->scanner.rs);
m->params = NULL;
m->argc = 0;
m->session->auto_commit = 0;
if (!m->sa)
m->sa = sa_create();
/*
* System has been prepared to parse it and generate code.
* Scan the complete string for SQL statements, stop at the first error.
*/
c->sqlcontext = sql;
while (msg == MAL_SUCCEED && m->scanner.rs->pos < m->scanner.rs->len) {
sql_rel *r;
stmt *s;
MalStkPtr oldglb = c->glb;
if (!m->sa)
m->sa = sa_create();
m->sym = NULL;
if ((err = sqlparse(m)) ||
/* Only forget old errors on transaction boundaries */
(mvc_status(m) && m->type != Q_TRANS) || !m->sym) {
if (!err)
err = mvc_status(m);
if (*m->errstr)
msg = createException(PARSE, "SQLparser", "%s", m->errstr);
*m->errstr = 0;
sqlcleanup(m, err);
execute = 0;
if (!err)
continue;
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
goto endofcompile;
}
/*
* We have dealt with the first parsing step and advanced the input reader
* to the next statement (if any).
* Now is the time to also perform the semantic analysis,
* optimize and produce code.
* We don't search the cache for a previous incarnation yet.
*/
MSinitClientPrg(c, "user", nme);
oldvtop = c->curprg->def->vtop;
oldstop = c->curprg->def->stop;
r = sql_symbol2relation(m, m->sym);
s = sql_relation2stmt(m, r);
#ifdef _SQL_COMPILE
mnstr_printf(c->fdout, "#SQLstatement:\n");
#endif
scanner_query_processed(&(m->scanner));
if (s == 0 || (err = mvc_status(m))) {
msg = createException(PARSE, "SQLparser", "%s", m->errstr);
handle_error(m, c->fdout, status);
sqlcleanup(m, err);
/* restore the state */
MSresetInstructions(c->curprg->def, oldstop);
freeVariables(c, c->curprg->def, c->glb, oldvtop);
c->curprg->def->errors = 0;
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
goto endofcompile;
}
/* generate MAL code */
if (backend_callinline(sql, c, s, 1) == 0)
addQueryToCache(c);
else
err = 1;
if (err ||c->curprg->def->errors) {
/* restore the state */
MSresetInstructions(c->curprg->def, oldstop);
freeVariables(c, c->curprg->def, c->glb, oldvtop);
c->curprg->def->errors = 0;
msg = createException(SQL, "SQLparser", "Errors encountered in query");
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
goto endofcompile;
}
#ifdef _SQL_COMPILE
mnstr_printf(c->fdout, "#result of sql.eval()\n");
printFunction(c->fdout, c->curprg->def, 0, c->listing);
#endif
if (execute) {
MalBlkPtr mb = c->curprg->def;
if (!output)
sql->out = NULL; /* no output */
msg = runMAL(c, mb, 0, 0);
MSresetInstructions(mb, oldstop);
freeVariables(c, mb, NULL, oldvtop);
}
sqlcleanup(m, 0);
if (!execute) {
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
goto endofcompile;
}
#ifdef _SQL_COMPILE
mnstr_printf(c->fdout, "#parse/execute result %d\n", err);
#endif
assert(c->glb == 0 || c->glb == oldglb); /* detect leak */
c->glb = oldglb;
}
if (m->results && result) { /* return all results sets */
*result = m->results;
m->results = NULL;
}
/*
* We are done; a MAL procedure resides in the cache.
*/
endofcompile:
if (execute)
MSresetInstructions(c->curprg->def, 1);
c->sqlcontext = be;
backend_destroy(sql);
GDKfree(n);
GDKfree(b);
bstream_destroy(m->scanner.rs);
if (m->sa)
sa_destroy(m->sa);
m->sa = NULL;
m->sym = NULL;
/* variable stack maybe resized, ie we need to keep the new stack */
status = m->session->status;
sizevars = m->sizevars;
topvars = m->topvars;
vars = m->vars;
*m = *o;
_DELETE(o);
m->sizevars = sizevars;
m->topvars = topvars;
m->vars = vars;
m->session->status = status;
m->session->auto_commit = ac;
return msg;
}