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Patch from Carl for relationships

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brianb
2000-04-22 21:34:32 +00:00
parent 1980ca9694
commit a23867cd2e
6 changed files with 116 additions and 4 deletions
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99
src/libmdb/backend.c
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@@ -98,6 +98,14 @@ char *mdb_postgres_types[] =
"Postgres_Unknown 0x0d",
"Postgres_Unknown 0x0e",
"Serial"};
char *bound_values[256];
char *relationships[4];
MdbColumn *col;
MdbCatalogEntry entry;
MdbTableDef *table;
int did_first;
char *mdb_get_coltype_string(MdbBackend *backend, int col_type)
{
if (col_type > 0x0f) {
@@ -143,8 +151,99 @@ MdbBackend *backend;
backend = (MdbBackend *) g_hash_table_lookup(mdb_backends, backend_name);
if (backend) {
mdb->default_backend = backend;
mdb->backend_name = (char *) malloc(strlen(backend_name)+1);
strcpy(mdb->backend_name, backend_name);
did_first = 0;
return 1;
} else {
return 0;
}
}
char *mdb_get_relationships(MdbHandle *mdb) {
int i, j, k;
static char text[255];
void do_first () {
mdb_read_catalog (mdb, MDB_TABLE);
/* loop over each entry in the catalog */
for (i=0; i < mdb->num_catalog; i++) {
entry = g_array_index (mdb->catalog, MdbCatalogEntry, i);
if ((entry.object_type == MDB_TABLE) &&
(strncmp (entry.object_name, "MSysRelationships", 17) == 0))
{
table = mdb_read_table (&entry);
if ( table->num_rows > 0 ) {
mdb_read_columns(table);
mdb_rewind_table(table);
for (k=0;k<table->num_cols;k++) {
bound_values[k] = (char *) malloc(256);
bound_values[k][0] = '\0';
mdb_bind_column(table,k+1,bound_values[k]);
}
relationships[0] = (char *) malloc(256); /* child column */
relationships[1] = (char *) malloc(256); /* child table */
relationships[2] = (char *) malloc(256); /* parent column
*/
relationships[3] = (char *) malloc(256); /* parent table */
}
did_first = 1;
return;
}
}
}
/*
* generate relationships by "reading" the MSysRelationships table
* szColumn contains the column name of the child table
* szObject contains the table name of the child table
* szReferencedColumn contains the column name of the parent table
* szReferencedObject contains the table name of the parent table
*/
sprintf(text,"%c",0);
if ( did_first == 0)
do_first();
if (table->cur_row < table->num_rows) {
if (mdb_fetch_row(table)) {
relationships[0][0] = '\0';
relationships[1][0] = '\0';
relationships[2][0] = '\0';
relationships[3][0] = '\0';
for (k=0;k<table->num_cols;k++) {
col=g_ptr_array_index(table->columns,k);
if (strncmp(col->name,"szColumn",8) == 0)
strcpy(relationships[0],bound_values[k]);
else if (strncmp(col->name,"szObject",8) == 0)
strcpy(relationships[1],bound_values[k]);
else if (strncmp(col->name,"szReferencedColumn",18) == 0)
strcpy(relationships[2],bound_values[k]);
else if (strncmp(col->name,"szReferencedObject",18) == 0)
strcpy(relationships[3],bound_values[k]);
}
if (strncmp(mdb->backend_name,"oracle",6) == 0)
sprintf(text,"alter table %s add constraint %s_%s foreign key
(%s) references %s(%s)",
relationships[1],relationships[3],relationships[1],
relationships[0],relationships[3],relationships[2]);
else
sprintf(text,"relationships are not supported for
%s",mdb->backend_name);
} /* got a row */
}
else {
for (k=0;k<table->num_cols;k++) {
free(bound_values[k]);
}
free(relationships[0]);
free(relationships[1]);
free(relationships[2]);
free(relationships[3]);
did_first = 0;
}
return text;
}