Документация PHP
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pdo_stmt_t definition
All fields should be treated as read-only unless explicitly stated otherwise.
pdo_stmt_t
/* represents a prepared statement */
struct _pdo_stmt_t {
/* driver specifics */
struct pdo_stmt_methods *methods; *
void *driver_data; **
/* if true, we've already successfully executed this statement at least
* once */
unsigned executed:1; ***
/* if true, the statement supports placeholders and can implement
* bindParam() for its prepared statements, if false, PDO should
* emulate prepare and bind on its behalf */
unsigned supports_placeholders:2; ****
/* the number of columns in the result set; not valid until after
* the statement has been executed at least once. In some cases, might
* not be valid until fetch (at the driver level) has been called at least once.
* */
int column_count; *****
struct pdo_column_data *columns; ******
/* points at the dbh that this statement was prepared on */
pdo_dbh_t *dbh;
/* keep track of bound input parameters. Some drivers support
* input/output parameters, but you can't rely on that working */
HashTable *bound_params;
/* When rewriting from named to positional, this maps positions to names */
HashTable *bound_param_map;
/* keep track of PHP variables bound to named (or positional) columns
* in the result set */
HashTable *bound_columns;
/* not always meaningful */
long row_count;
/* used to hold the statement's current query */
char *query_string;
int query_stringlen;
/* the copy of the query with expanded binds ONLY for emulated-prepare drivers */
char *active_query_string;
int active_query_stringlen;
/* the cursor specific error code. */
pdo_error_type error_code;
/* used by the query parser for driver specific
* parameter naming (see pgsql driver for example) */
const char *named_rewrite_template;
};
| * |
The driver must set this during SKEL_handle_preparer(). |
| ** |
This item is for use by the driver; the intended usage is to store a pointer (during SKEL_handle_factory()) to whatever instance data is required to maintain a connection to the database. |
| *** |
This is set by PDO after the statement has been executed for the first time. Your driver can inspect this value to determine if it can skip one-time actions as an optimization. |
| **** |
Discussed in more detail in Fleshing out your skeleton. |
| ***** |
Your driver is responsible for setting this field to the number of columns available in a result set. This is usually set during SKEL_stmt_execute() but with some database implementations, the column count may not be available until SKEL_stmt_fetch() has been called at least once. Drivers that implement SKEL_stmt_next_rowset() should update the column count when a new rowset is available. |
| ****** |
PDO will allocate this field based on the value that you set for the column count. You are responsible for populating each column during SKEL_stmt_describe(). You must set the precision , maxlen , name , namelen and param_type members for each column. The name is expected to be allocated using emalloc(); PDO will call efree() at the appropriate time. |