/*
* Delete a row from the specified table
* _h: structure representing database connection
* _k: key names
* _o: operators
* _v: values of the keys that must match
* _n: number of key=value pairs
*/
int db_delete(db_con_t* _h, db_key_t* _k, db_op_t* _o, db_val_t* _v, int _n)
{
int off, ret;
if (!_h) {
LOG(L_ERR, "db_delete: Invalid parameter value\n");
return -1;
}
ret = snprintf(sql_buf, SQL_BUF_LEN, "delete from %s", CON_TABLE(_h));
if (ret < 0 || ret >= SQL_BUF_LEN) goto error;
off = ret;
if (_n) {
ret = snprintf(sql_buf + off, SQL_BUF_LEN - off, " where ");
if (ret < 0 || ret >= (SQL_BUF_LEN - off)) goto error;
off += ret;
ret = print_where(CON_CONNECTION(_h), sql_buf + off, SQL_BUF_LEN - off, _k, _o, _v, _n);
if (ret < 0) return -1;
off += ret;
}
*(sql_buf + off) = '\0';
if (submit_query(_h, sql_buf) < 0) {
LOG(L_ERR, "db_delete: Error while submitting query\n");
return -2;
}
return 0;
error:
LOG(L_ERR, "db_delete: Error in snprintf\n");
return -1;
}
/*
* Query table for specified rows
* _h: structure representing database connection
* _k: key names
* _op: operators
* _v: values of the keys that must match
* _c: column names to return
* _n: nmber of key=values pairs to compare
* _nc: number of columns to return
* _o: order by the specified column
*/
int db_query(db_con_t* _h, db_key_t* _k, db_op_t* _op,
db_val_t* _v, db_key_t* _c, int _n, int _nc,
db_key_t _o, db_res_t** _r)
{
int off, rv;
if (!_c) {
off = snprintf(sql_buf, SQL_BUF_LEN,
"select * from %s ", CON_TABLE(_h));
} else {
off = snprintf(sql_buf, SQL_BUF_LEN, "select ");
off += print_columns(sql_buf + off, SQL_BUF_LEN - off, _c, _nc);
off += snprintf(sql_buf + off, SQL_BUF_LEN - off,
"from %s ", CON_TABLE(_h));
}
if (_n) {
off += snprintf(sql_buf + off, SQL_BUF_LEN - off, "where ");
off += print_where(sql_buf + off, SQL_BUF_LEN - off,
_k, _op, _v, _n);
}
if (_o) {
off += snprintf(sql_buf + off, SQL_BUF_LEN - off,
"order by %s", _o);
}
if(begin_transaction(_h, sql_buf)) return(-1);
if (submit_query(_h, sql_buf) < 0) {
LOG(L_ERR, "db_query(): Error while submitting query\n");
return -2;
}
rv = get_result(_h, _r);
free_query(_h);
commit_transaction(_h);
return(rv);
}
/*
* Query table for specified rows
* _h: structure representing database connection
* _k: key names
* _op: operators
* _v: values of the keys that must match
* _c: column names to return
* _n: number of key=values pairs to compare
* _nc: number of columns to return
* _o: order by the specified column
*/
int db_query(db_con_t* _h, db_key_t* _k, db_op_t* _op,
db_val_t* _v, db_key_t* _c, int _n, int _nc,
db_key_t _o, db_res_t** _r)
{
int off, ret;
if (!_h) {
LOG(L_ERR, "db_query: Invalid parameter value\n");
return -1;
}
if (!_c) {
ret = snprintf(sql_buf, SQL_BUF_LEN, "select * from %s ", CON_TABLE(_h));
if (ret < 0 || ret >= SQL_BUF_LEN) goto error;
off = ret;
} else {
ret = snprintf(sql_buf, SQL_BUF_LEN, "select ");
if (ret < 0 || ret >= SQL_BUF_LEN) goto error;
off = ret;
ret = print_columns(sql_buf + off, SQL_BUF_LEN - off, _c, _nc);
if (ret < 0) return -1;
off += ret;
ret = snprintf(sql_buf + off, SQL_BUF_LEN - off, "from %s ", CON_TABLE(_h));
if (ret < 0 || ret >= (SQL_BUF_LEN - off)) goto error;
off += ret;
}
if (_n) {
ret = snprintf(sql_buf + off, SQL_BUF_LEN - off, "where ");
if (ret < 0 || ret >= (SQL_BUF_LEN - off)) goto error;
off += ret;
ret = print_where(CON_CONNECTION(_h), sql_buf + off, SQL_BUF_LEN - off, _k, _op, _v, _n);
if (ret < 0) return -1;;
off += ret;
}
if (_o) {
ret = snprintf(sql_buf + off, SQL_BUF_LEN - off, "order by %s", _o);
if (ret < 0 || ret >= (SQL_BUF_LEN - off)) goto error;
off += ret;
}
*(sql_buf + off) = '\0';
if (submit_query(_h, sql_buf) < 0) {
LOG(L_ERR, "db_query: Error while submitting query\n");
return -2;
}
return store_result(_h, _r);
error:
LOG(L_ERR, "db_query: Error in snprintf\n");
return -1;
}
/*
* Delete a row from the specified table
* _h: structure representing database connection
* _k: key names
* _o: operators
* _v: values of the keys that must match
* _n: number of key=value pairs
*/
int db_delete(db_con_t* _h, db_key_t* _k, db_op_t* _o, db_val_t* _v, int _n)
{
int off;
off = snprintf(sql_buf, SQL_BUF_LEN, "delete from %s", CON_TABLE(_h));
if (_n) {
off += snprintf(sql_buf + off, SQL_BUF_LEN - off, " where ");
off += print_where(sql_buf + off, SQL_BUF_LEN - off, _k,
_o, _v, _n);
}
if(begin_transaction(_h, sql_buf)) return(-1);
if (submit_query(_h, sql_buf) < 0) {
LOG(L_ERR, "db_delete(): Error while deleting\n");
return -2;
}
free_query(_h);
commit_transaction(_h);
return(0);
}
/*
* Update some rows in the specified table
* _h: structure representing database connection
* _k: key names
* _o: operators
* _v: values of the keys that must match
* _uk: updated columns
* _uv: updated values of the columns
* _n: number of key=value pairs
* _un: number of columns to update
*/
int db_update(db_con_t* _h, db_key_t* _k, db_op_t* _o, db_val_t* _v,
db_key_t* _uk, db_val_t* _uv, int _n, int _un)
{
int off;
off = snprintf(sql_buf, SQL_BUF_LEN, "update %s set ", CON_TABLE(_h));
off += print_set(sql_buf + off, SQL_BUF_LEN - off, _uk, _uv, _un);
if (_n) {
off += snprintf(sql_buf + off, SQL_BUF_LEN - off, " where ");
off += print_where(sql_buf + off, SQL_BUF_LEN - off, _k,
_o, _v, _n);
*(sql_buf + off) = '\0';
}
if(begin_transaction(_h, sql_buf)) return(-1);
if (submit_query(_h, sql_buf) < 0) {
LOG(L_ERR, "db_update(): Error while updating\n");
return -2;
}
free_query(_h);
commit_transaction(_h);
return(0);
}
