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Debian patch 160-foreign-keys from Nirgal Vourgère

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This commit is contained in:
Brian Bruns 2010-06-20 16:28:54 -04:00
parent 30e5a6f4bb
commit f2bc2e1a21
1 changed files with 65 additions and 32 deletions
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97
src/libmdb/backend.c
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@ -283,25 +283,31 @@ int mdb_set_default_backend(MdbHandle *mdb, const char *backend_name)
* '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.
* 'grbit' contains integrity constraints.
*
* Returns: a string stating that relationships are not supported for the
* selected backend, or a string containing SQL commands for setting up
* the relationship, tailored for the selected backend. The caller is
* responsible for freeing this string.
* the relationship, tailored for the selected backend.
* Returns NULL on last iteration.
* The caller is responsible for freeing this string.
*/
char *mdb_get_relationships(MdbHandle *mdb)
{
unsigned int i;
gchar *text = NULL; /* String to be returned */
static char *bound[4]; /* Bound values */
static char *bound[5]; /* Bound values */
static MdbTableDef *table; /* Relationships table */
int backend = 0; /* Backends: 1=oracle */
int backend = 0; /* Backends: 1=oracle, 2=postgres */
char *quoted_table_1, *quoted_column_1,
*quoted_table_2, *quoted_column_2,
*constraint_name, *quoted_constraint_name;
*index_name, *quoted_index_name,
*constraint_name, *quoted_constraint_name;
long grbit;
if (strncmp(mdb->backend_name,"oracle",6) == 0) {
if (!strcmp(mdb->backend_name, "oracle")) {
backend = 1;
} else if (!strcmp(mdb->backend_name, "postgres")) {
backend = 2;
} else {
if (is_init == 0) { /* the first time through */
is_init = 1;
@ -317,55 +323,82 @@ char *mdb_get_relationships(MdbHandle *mdb)
if (is_init == 0) {
table = mdb_read_table_by_name(mdb, "MSysRelationships", MDB_TABLE);
if ((!table) || (table->num_rows == 0)) {
fprintf(stderr, "No MSysRelationships\n");
return NULL;
}
mdb_read_columns(table);
for (i=0;i<4;i++) {
for (i=0;i<5;i++) {
bound[i] = (char *) g_malloc0(MDB_BIND_SIZE);
}
mdb_bind_column_by_name(table, "szColumn", bound[0], NULL);
mdb_bind_column_by_name(table, "szObject", bound[1], NULL);
mdb_bind_column_by_name(table, "szReferencedColumn", bound[2], NULL);
mdb_bind_column_by_name(table, "szReferencedObject", bound[3], NULL);
mdb_bind_column_by_name(table, "grbit", bound[4], NULL);
mdb_rewind_table(table);
is_init = 1;
}
else if (table->cur_row >= table->num_rows) { /* past the last row */
for (i=0;i<4;i++)
g_free(bound[i]);
is_init = 0;
return NULL;
else {
if (!table) {
fprintf(stderr, "table is NULL\n");
}
if (table->cur_row >= table->num_rows) { /* past the last row */
for (i=0;i<5;i++)
g_free(bound[i]);
is_init = 0;
return NULL;
}
}
if (!mdb_fetch_row(table)) {
for (i=0;i<4;i++)
for (i=0;i<5;i++)
g_free(bound[i]);
is_init = 0;
return NULL;
}
switch (backend) {
case 1: /* oracle */
quoted_table_1 = mdb->default_backend->quote_name(bound[1]);
quoted_column_1 = mdb->default_backend->quote_name(bound[0]);
quoted_table_2 = mdb->default_backend->quote_name(bound[3]);
quoted_column_2 = mdb->default_backend->quote_name(bound[2]);
constraint_name = g_strconcat(bound[3], "_", bound[1], NULL);
quoted_constraint_name = mdb->default_backend->quote_name(constraint_name);
free(constraint_name);
text = g_strconcat("ALTER TABLE ", quoted_table_1,
" ADD CONSTRAINT ", quoted_constraint_name,
" FOREIGN KEY (", quoted_column_1, ")"
" REFERENCES ", quoted_table_2, "(", quoted_column_2, ");", NULL);
free(quoted_table_1);
free(quoted_column_1);
free(quoted_table_2);
free(quoted_column_2);
free(quoted_constraint_name);
break;
quoted_table_1 = mdb->default_backend->quote_name(bound[1]);
quoted_column_1 = mdb->default_backend->quote_name(bound[0]);
quoted_table_2 = mdb->default_backend->quote_name(bound[3]);
quoted_column_2 = mdb->default_backend->quote_name(bound[2]);
grbit = atoi(bound[4]);
constraint_name = g_strconcat(bound[1], "_", bound[0], "_fk", NULL);
quoted_constraint_name = mdb->default_backend->quote_name(constraint_name);
free(constraint_name);
index_name = g_strconcat(bound[3], "_", bound[2], "_idx", NULL);
quoted_index_name = mdb->default_backend->quote_name(index_name);
free(index_name);
if (grbit & 0x00000002) {
text = g_strconcat(
"-- Relationship from ", quoted_table_1,
" (", quoted_column_1, ")"
" to ", quoted_table_2, "(", quoted_column_2, ")",
" does not enforce integrity.\n", NULL);
} else {
switch (backend) {
case 1: /* oracle */
case 2: /* postgres */
text = g_strconcat(
"ALTER TABLE ", quoted_table_1,
" ADD CONSTRAINT ", quoted_constraint_name,
" FOREIGN KEY (", quoted_column_1, ")"
" REFERENCES ", quoted_table_2, "(", quoted_column_2, ")",
(grbit & 0x00000100) ? " ON UPDATE CASCADE" : "",
(grbit & 0x00001000) ? " ON DELETE CASCADE" : "",
";\n", NULL);
break;
}
}
free(quoted_table_1);
free(quoted_column_1);
free(quoted_table_2);
free(quoted_column_2);
free(quoted_constraint_name);
free(quoted_index_name);
return (char *)text;
}