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/* MDB Tools - A library for reading MS Access database files
* Copyright (C) 2000 Brian Bruns
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
/*
** functions to deal with different backend database engines
*/
#include "mdbtools.h"
#ifdef DMALLOC
#include "dmalloc.h"
#endif
static int is_init;
static GHashTable *mdb_backends;
/* Access data types */
static MdbBackendType mdb_access_types[] = {
{"Unknown 0x00", 0,0,0 },
{"Boolean", 0,0,0},
{"Byte", 0,0,0},
{"Integer", 0,0,0},
{"Long Integer", 0,0,0},
{"Currency", 0,0,0},
{"Single", 0,0,0},
{"Double", 0,0,0},
{"DateTime (Short)", 0,0,1},
{"Unknown 0x09", 0,0,0},
{"Text", 1,0,1},
{"OLE", 1,0,1},
{"Memo/Hyperlink",1,0,1},
{"Unknown 0x0d",0,0,0},
{"Unknown 0x0e",0,0,0},
{"Replication ID",0,0,0},
{"Numeric",1,1,0}
};
/* Oracle data types */
static MdbBackendType mdb_oracle_types[] = {
{"Oracle_Unknown 0x00",0,0,0},
{"NUMBER",1,0,0},
{"NUMBER",1,0,0},
{"NUMBER",1,0,0},
{"NUMBER",1,0,0},
{"NUMBER",1,0,0},
{"FLOAT",0,0,0},
{"FLOAT",0,0,0},
{"DATE",0,0,0},
{"Oracle_Unknown 0x09",0,0,0},
{"VARCHAR2",1,0,1},
{"BLOB",1,0,1},
{"CLOB",1,0,1},
{"Oracle_Unknown 0x0d",0,0,0},
{"Oracle_Unknown 0x0e",0,0,0},
{"NUMBER",1,0,0},
{"NUMBER",1,0,0},
};
/* Sybase/MSSQL data types */
static MdbBackendType mdb_sybase_types[] = {
{"Sybase_Unknown 0x00",0,0,0},
{"bit",0,0,0},
{"char",1,0,1},
{"smallint",0,0,0},
{"int",0,0,0},
{"money",0,0,0},
{"real",0,0,0},
{"float",0,0,0},
{"smalldatetime",0,0,0},
{"Sybase_Unknown 0x09",0,0,0},
{"varchar",1,0,1},
{"varbinary",1,0,1},
{"text",1,0,1},
{"Sybase_Unknown 0x0d",0,0,0},
{"Sybase_Unknown 0x0e",0,0,0},
{"Sybase_Replication ID",0,0,0},
{"numeric",1,1,0},
};
/* Postgres data types */
static MdbBackendType mdb_postgres_types[] = {
{"Postgres_Unknown 0x00",0,0,0},
{"Bool",0,0,0},
{"Int2",0,0,0},
{"Int4",0,0,0},
{"Int8",0,0,0},
{"Money",0,0,0},
{"Float4",0,0,0},
{"Float8",0,0,0},
{"Timestamp",0,0,0},
{"Postgres_Unknown 0x09",0,0,0},
{"Char",1,0,1},
{"Postgres_Unknown 0x0b",0,0,0},
{"Postgres_Unknown 0x0c",0,0,0},
{"Postgres_Unknown 0x0d",0,0,0},
{"Postgres_Unknown 0x0e",0,0,0},
{"Serial",0,0,0},
{"Postgres_Unknown 0x10",0,0,0},
};
/* MySQL data types */
static MdbBackendType mdb_mysql_types[] = {
{"Text",1,0,1},
{"char",0,0,0},
{"int",0,0,0},
{"int",0,0,0},
{"int",0,0,0},
{"float",0,0,0},
{"float",0,0,0},
{"float",0,0,0},
{"date",0,0,1},
{"varchar",1,0,1},
{"varchar",1,0,1},
{"varchar",1,0,1},
{"text",1,0,1},
{"blob",0,0,0},
{"text",1,0,1},
{"numeric",1,1,0},
{"numeric",1,1,0},
};
static gboolean mdb_drop_backend(gpointer key, gpointer value, gpointer data);
char *mdb_get_coltype_string(MdbBackend *backend, int col_type)
{
static char buf[16];
if (col_type > 0x10 ) {
// return NULL;
snprintf(buf,sizeof(buf), "type %04x", col_type);
return buf;
} else {
return backend->types_table[col_type].name;
}
}
int mdb_coltype_takes_length(MdbBackend *backend, int col_type)
{
return backend->types_table[col_type].needs_length;
}
/**
* mdb_init_backends
*
* Initializes the mdb_backends hash and loads the builtin backends.
* Use mdb_remove_backends() to destroy this hash when done.
*/
void mdb_init_backends(void)
{
mdb_backends = g_hash_table_new(g_str_hash, g_str_equal);
mdb_register_backend(mdb_access_types, "access");
mdb_register_backend(mdb_sybase_types, "sybase");
mdb_register_backend(mdb_oracle_types, "oracle");
mdb_register_backend(mdb_postgres_types, "postgres");
mdb_register_backend(mdb_mysql_types, "mysql");
}
void mdb_register_backend(MdbBackendType *backend_type, char *backend_name)
{
MdbBackend *backend = (MdbBackend *) g_malloc0(sizeof(MdbBackend));
backend->types_table = backend_type;
g_hash_table_insert(mdb_backends, backend_name, backend);
}
/**
* mdb_remove_backends
*
* Removes all entries from and destroys the mdb_backends hash.
*/
void mdb_remove_backends(void)
{
g_hash_table_foreach_remove(mdb_backends, mdb_drop_backend, NULL);
g_hash_table_destroy(mdb_backends);
}
static gboolean mdb_drop_backend(gpointer key, gpointer value, gpointer data)
{
MdbBackend *backend = (MdbBackend *)value;
g_free (backend);
return TRUE;
}
/**
* mdb_set_default_backend
* @mdb: Handle to open MDB database file
* @backend_name: Name of the backend to set as default
*
* Sets the default backend of the handle @mdb to @backend_name.
*
* Returns: 1 if successful, 0 if unsuccessful.
*/
int mdb_set_default_backend(MdbHandle *mdb, char *backend_name)
{
MdbBackend *backend;
backend = (MdbBackend *) g_hash_table_lookup(mdb_backends, backend_name);
if (backend) {
mdb->default_backend = backend;
mdb->backend_name = (char *) g_strdup(backend_name);
is_init = 0;
return 1;
} else {
return 0;
}
}
/**
* mdb_get_relationships
* @mdb: Handle to open MDB database file
*
* Generates 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.
*
* 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.
*/
char *mdb_get_relationships(MdbHandle *mdb)
{
unsigned int i;
gchar *text = NULL; /* String to be returned */
static char *bound[4]; /* Bound values */
static MdbTableDef *table; /* Relationships table */
int backend = 0; /* Backends: 1=oracle */
if (strncmp(mdb->backend_name,"oracle",6) == 0) {
backend = 1;
} else {
if (is_init == 0) { /* the first time through */
is_init = 1;
return (char *) g_strconcat(
"-- relationships are not supported for ",
mdb->backend_name, NULL);
} else { /* the second time through */
is_init = 0;
return NULL;
}
}
if (is_init == 0) {
table = mdb_read_table_by_name(mdb, "MSysRelationships", MDB_TABLE);
if ((!table) || (table->num_rows == 0)) {
return NULL;
}
mdb_read_columns(table);
for (i=0;i<4;i++) {
bound[i] = (char *) g_malloc0(MDB_BIND_SIZE);
}
mdb_bind_column_by_name(table, "szColumn", bound[0]);
mdb_bind_column_by_name(table, "szObject", bound[1]);
mdb_bind_column_by_name(table, "szReferencedColumn", bound[2]);
mdb_bind_column_by_name(table, "szReferencedObject", bound[3]);
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;
}
if (!mdb_fetch_row(table)) {
for (i=0;i<4;i++)
g_free(bound[i]);
is_init = 0;
return NULL;
}
switch (backend) {
case 1: /* oracle */
text = g_strconcat("alter table ", bound[1],
" add constraint ", bound[3], "_", bound[1],
" foreign key (", bound[0], ")"
" references ", bound[3], "(", bound[2], ")", NULL);
break;
}
return (char *)text;
}
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