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mysql_stubs.c
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/*
* This module provides access to MySQL from Objective Caml.
*/
#include <stdio.h> /* sprintf */
#include <string.h>
#include <stdarg.h>
/* OCaml runtime system */
#define CAML_NAME_SPACE
#include <caml/mlvalues.h>
#include <caml/memory.h>
#include <caml/fail.h>
#include <caml/alloc.h>
#include <caml/callback.h>
#include <caml/custom.h>
#include <caml/signals.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
/* else attempt without (think msvc build) */
#endif
/* MySQL API */
#if defined(_WIN32)
/* mode_t typedef conflict (mingw and mysql) */
#ifdef __MINGW32__
#include <winsock.h>
#else
#include <my_global.h>
#endif
#endif
#if defined(HAVE_MYSQL_MYSQL_H)
#include <mysql/mysql.h>
#else
#include <mysql.h>
#endif
#define EXTERNAL /* dummy to highlight fn's exported to ML */
#ifdef CAML_TEST_GC_SAFE
#include <unistd.h>
#define caml_enter_blocking_section() if (1) { caml_enter_blocking_section(); sleep(1); }
#endif
/* Abstract types
*
* dbd - data base descriptor
*
* header with Abstract_tag
* 0: MYSQL*
* 1: bool (open == true, closed == false)
*
* res - result returned from query/exec
*
* header with Final_tag
* 0: finalization function for 1
* 1: MYSQL_RES*
*
*/
/* macros to access C values stored inside the abstract values */
#define DBDmysql(x) ((MYSQL*)(Field(x,1)))
#define DBDopen(x) (Field(x,2))
#define RESval(x) (*(MYSQL_RES**)Data_custom_val(x))
#define STMTval(x) (*(MYSQL_STMT**)Data_custom_val(x))
#define ROWval(x) (*(row_t**)Data_custom_val(x))
static void mysqlfailwith(char *err) Noreturn;
static void mysqlfailmsg(const char *fmt, ...) Noreturn;
static void
mysqlfailwith(char *err)
{
caml_raise_with_string(*caml_named_value("mysql error"), err);
}
static void
mysqlfailmsg(const char *fmt, ...)
{
char buf[1024];
va_list args;
va_start(args, fmt);
vsnprintf(buf, sizeof buf, fmt, args);
va_end(args);
caml_raise_with_string(*caml_named_value("mysql error"), buf);
}
#define Val_none Val_int(0)
static inline value
Val_some( value v )
{
CAMLparam1( v );
CAMLlocal1( some );
some = caml_alloc_small(1, 0);
Field(some, 0) = v;
CAMLreturn( some );
}
#define Some_val(v) Field(v,0)
static int
int_option(value v)
{
if (v == Val_none)
return 0;
else
return Int_val(Some_val(v));
}
/*
* strdup_option copies a char* from an ML string option value. Returns
* NULL for None.
*/
static char*
strdup_option(value v)
{
if (v == Val_none)
return (char*) NULL;
else
return strdup(String_val(Some_val(v)));
}
/*
* val_str_option creates a string option value from a char* (NONE for
* NULL) -- dual to str_option().
*/
static value
val_str_option(const char* s, unsigned long length)
{
CAMLparam0();
CAMLlocal1(v);
if (!s)
CAMLreturn(Val_none);
else
{
v = caml_alloc_string(length);
memcpy(String_val(v), s, length);
CAMLreturn(Val_some(v));
}
}
/* check_db checks that the data base connection is still open. The
* open flag is reset by db_disconnect().
*/
static inline MYSQL*
check_db(value dbd, const char *fun)
{
if (!Bool_val(DBDopen(dbd)))
mysqlfailmsg("Mysql.%s called with closed connection", fun);
return DBDmysql(dbd);
}
static void
conn_finalize(value dbd)
{
if (Bool_val(DBDopen(dbd)))
{
MYSQL* db = DBDmysql(dbd);
caml_enter_blocking_section();
mysql_close(db);
caml_leave_blocking_section();
}
}
/* db_connect opens a data base connection and returns an abstract
* connection object.
*/
static unsigned int ml_mysql_protocol_type[] = {
MYSQL_PROTOCOL_DEFAULT, MYSQL_PROTOCOL_TCP, MYSQL_PROTOCOL_SOCKET,
MYSQL_PROTOCOL_PIPE, MYSQL_PROTOCOL_MEMORY
};
#define SET_OPTION(option, p) if (0 != mysql_options(init,MYSQL_##option,p)) mysqlfailwith( "MYSQL_" #option ); break
#define SET_OPTION_BOOL(option) option_bool = Bool_val(v); SET_OPTION(option, &option_bool)
#define SET_OPTION_INT(option) option_int = Int_val(v); SET_OPTION(option, &option_int)
#define SET_OPTION_STR(option) SET_OPTION(option, String_val(v))
#define SET_CLIENT_FLAG(flag) client_flag |= flag; break
EXTERNAL value
db_connect(value options, value args)
{
CAMLparam2(options, args);
CAMLlocal2(res, v);
char *host = NULL;
char *db = NULL;
unsigned int port = 0;
char *pwd = NULL;
char *user = NULL;
char *socket = NULL;
MYSQL *init;
MYSQL *mysql;
unsigned int option_int;
my_bool option_bool;
unsigned long client_flag = 0;
init = mysql_init(NULL);
if (!init)
{
mysqlfailwith("connect failed");
}
else
{
while (options != Val_emptylist)
{
if (Is_block(Field(options,0)))
{
v = Field(Field(options,0),0);
switch (Tag_val(Field(options,0)))
{
case 0: SET_OPTION_BOOL(OPT_LOCAL_INFILE);
case 1: SET_OPTION_BOOL(OPT_RECONNECT);
case 2: SET_OPTION_BOOL(OPT_SSL_VERIFY_SERVER_CERT);
case 3: SET_OPTION_BOOL(REPORT_DATA_TRUNCATION);
case 4: SET_OPTION_BOOL(SECURE_AUTH);
case 5: SET_OPTION(OPT_PROTOCOL, &ml_mysql_protocol_type[Int_val(v)]);
case 6: SET_OPTION_INT(OPT_CONNECT_TIMEOUT);
case 7: SET_OPTION_INT(OPT_READ_TIMEOUT);
case 8: SET_OPTION_INT(OPT_WRITE_TIMEOUT);
case 9: SET_OPTION_STR(INIT_COMMAND);
case 10: SET_OPTION_STR(READ_DEFAULT_FILE);
case 11: SET_OPTION_STR(READ_DEFAULT_GROUP);
case 12: SET_OPTION_STR(SET_CHARSET_DIR);
case 13: SET_OPTION_STR(SET_CHARSET_NAME);
case 14: SET_OPTION_STR(SHARED_MEMORY_BASE_NAME);
default:
caml_invalid_argument("Mysql.connect: unknown option");
}
}
else
{
switch (Int_val(Field(options,0)))
{
case 0: SET_OPTION(OPT_COMPRESS, NULL);
case 1: SET_OPTION(OPT_NAMED_PIPE, NULL);
case 2: SET_CLIENT_FLAG(CLIENT_FOUND_ROWS);
default: caml_invalid_argument("Mysql.connect: unknown option");
}
}
options = Field(options, 1);
}
host = strdup_option(Field(args,0));
db = strdup_option(Field(args,1));
port = (unsigned int) int_option(Field(args,2));
pwd = strdup_option(Field(args,3));
user = strdup_option(Field(args,4));
socket = strdup_option(Field(args,5));
caml_enter_blocking_section();
mysql = mysql_real_connect(init ,host ,user
,pwd ,db ,port
,socket, client_flag);
caml_leave_blocking_section();
free(host); free(db); free(pwd); free(user); free(socket);
if (!mysql)
{
mysqlfailwith((char*)mysql_error(init));
}
else
{
res = caml_alloc_final(3, conn_finalize, 0, 1);
Field(res, 1) = (value)mysql;
Field(res, 2) = Val_true;
}
}
CAMLreturn(res);
}
EXTERNAL value
db_library_init(value v_unit)
{
mysql_library_init(0,NULL,NULL);
return Val_unit;
}
EXTERNAL value
db_change_user(value v_dbd, value args)
{
char *db;
char *pwd;
char *user;
my_bool ret;
MYSQL* mysql = check_db(v_dbd,"change_user");
db = strdup_option(Field(args,1));
pwd = strdup_option(Field(args,3));
user = strdup_option(Field(args,4));
caml_enter_blocking_section();
ret = mysql_change_user(mysql, user, pwd, db);
caml_leave_blocking_section();
free(db); free(pwd); free(user);
if (ret)
mysqlfailmsg("Mysql.change_user: %s", mysql_error(mysql));
return Val_unit;
}
EXTERNAL value
db_list_dbs(value v_dbd, value pattern, value blah)
{
CAMLparam3(v_dbd, pattern, blah);
CAMLlocal1(dbs);
MYSQL* mysql = check_db(v_dbd,"list_dbs");
char *wild = strdup_option(pattern);
int n, i;
MYSQL_RES *res;
MYSQL_ROW row;
caml_enter_blocking_section();
res = mysql_list_dbs(mysql, wild);
caml_leave_blocking_section();
free(wild);
if (!res)
CAMLreturn(Val_none);
n = mysql_num_rows(res);
if (n == 0)
{
mysql_free_result(res);
CAMLreturn(Val_none);
}
dbs = caml_alloc_tuple(n); /* Array */
i = 0;
while ((row = mysql_fetch_row(res)) != NULL)
{
Store_field(dbs, i, caml_copy_string(row[0]));
i++;
}
mysql_free_result(res);
CAMLreturn(Val_some(dbs));
}
EXTERNAL value
db_select_db(value v_dbd, value v_newdb)
{
CAMLparam2(v_dbd,v_newdb);
MYSQL* mysql = check_db(v_dbd, "select_db");
char* newdb = strdup(String_val(v_newdb));
my_bool ret;
caml_enter_blocking_section();
ret = mysql_select_db(mysql, newdb);
caml_leave_blocking_section();
free(newdb);
if (ret)
mysqlfailmsg("Mysql.select_db: %s", mysql_error(mysql));
CAMLreturn(Val_unit);
}
/*
* db_disconnect closes a db connection and marks the dbd closed.
*/
EXTERNAL value
db_disconnect(value dbd)
{
CAMLparam1(dbd);
MYSQL* db = check_db(dbd,"disconnect");
caml_enter_blocking_section();
mysql_close(db);
caml_leave_blocking_section();
Field(dbd, 1) = Val_false;
Field(dbd, 2) = Val_false; /* Mark closed */
CAMLreturn(Val_unit);
}
EXTERNAL value
db_ping(value dbd)
{
CAMLparam1(dbd);
MYSQL* db = check_db(dbd,"ping");
caml_enter_blocking_section();
if (mysql_ping(db))
{
caml_leave_blocking_section();
mysqlfailmsg("Mysql.ping: %s", mysql_error(db));
}
caml_leave_blocking_section();
CAMLreturn(Val_unit);
}
/*
* finalize -- this is called when a data base result is garbage
* collected -- frees memory allocated by MySQL.
*/
static void
res_finalize(value result)
{
MYSQL_RES *res = RESval(result);
if (res)
mysql_free_result(res);
}
struct custom_operations res_ops = {
"Mysql Query Results",
res_finalize,
custom_compare_default,
custom_hash_default,
custom_serialize_default,
custom_deserialize_default,
#if defined(custom_compare_ext_default)
custom_compare_ext_default,
#endif
};
/*
* db_exec -- execute a SQL query or command. Returns a handle to
* access the result.
*/
EXTERNAL value
db_exec(value v_dbd, value v_sql)
{
CAMLparam2(v_dbd, v_sql);
CAMLlocal1(res);
MYSQL *mysql = check_db(v_dbd,"exec");
char* sql = strdup(String_val(v_sql));
size_t len = caml_string_length(v_sql);
int ret;
caml_enter_blocking_section();
ret = mysql_real_query(mysql, sql, len);
caml_leave_blocking_section();
free(sql);
if (ret)
{
mysqlfailmsg("Mysql.exec: %s", mysql_error(mysql));
}
else
{
res = caml_alloc_custom(&res_ops, sizeof(MYSQL_RES*), 0, 1);
RESval(res) = mysql_store_result(mysql);
}
CAMLreturn(res);
}
/*
* db_fetch -- fetch one result tuple, represented as array of string
* options. In case a value is Null, the respective value is None.
* Returns (Some v) in case there is such a result and None otherwise.
* Moves the internal result cursor to the next tuple.
*/
EXTERNAL value
db_fetch (value result)
{
CAMLparam1(result);
CAMLlocal2(fields, s);
unsigned int i, n;
unsigned long *length; /* array of long */
MYSQL_RES *res;
MYSQL_ROW row;
res = RESval(result);
if (!res)
mysqlfailwith("Mysql.fetch: result did not return fetchable data");
n = mysql_num_fields(res);
if (n == 0)
mysqlfailwith("Mysql.fetch: no columns");
row = mysql_fetch_row(res);
if (!row)
CAMLreturn(Val_none);
/* create Some([| f1; f2; .. ;fn |]) */
length = mysql_fetch_lengths(res); /* length[] */
fields = caml_alloc_tuple(n); /* array */
for (i=0;i<n;i++) {
s = val_str_option(row[i], length[i]);
Store_field(fields, i, s);
}
CAMLreturn(Val_some(fields));
}
EXTERNAL value
db_to_row(value result, value offset)
{
int64_t off = Int64_val(offset);
MYSQL_RES *res;
res = RESval(result);
if (!res)
mysqlfailwith("Mysql.to_row: result did not return fetchable data");
if (off < 0 || off > (int64_t)mysql_num_rows(res)-1)
caml_invalid_argument("Mysql.to_row: offset out of range");
mysql_data_seek(res, off);
return Val_unit;
}
/*
* db_status -- returns current status (simplistic)
*/
EXTERNAL value
db_status(value dbd)
{
CAMLparam1(dbd);
CAMLreturn(Val_int(mysql_errno(check_db(dbd,"status"))));
}
/*
* db_errmsg -- returns string option with last error message (None ==
* no error)
*/
EXTERNAL value
db_errmsg(value dbd)
{
CAMLparam1(dbd);
CAMLlocal1(s);
const char *msg;
msg = mysql_error(check_db(dbd,"errmsg"));
if (!msg || msg[0] == '\0')
msg = (char*) NULL;
s = val_str_option(msg, msg == (char *) NULL ? 0 : strlen(msg));
CAMLreturn(s);
}
/*
* db_escape - takes a string and escape all characters inside which
* must be escaped inside MySQL strings. This helps to construct SQL
* statements easily. Simply returns the new string including the
* quotes.
*/
EXTERNAL value
db_escape(value str)
{
CAMLparam1(str);
char *s;
char *buf;
int len, esclen;
CAMLlocal1(res);
s = String_val(str);
len = caml_string_length(str);
buf = (char*)caml_stat_alloc(2*len+1);
esclen = mysql_escape_string(buf,s,len);
res = caml_alloc_string(esclen);
memcpy(String_val(res), buf, esclen);
caml_stat_free(buf);
CAMLreturn(res);
}
EXTERNAL value
db_real_escape(value dbd, value str)
{
CAMLparam2(dbd, str);
char *s;
char *buf;
int len, esclen;
MYSQL *mysql;
CAMLlocal1(res);
mysql = check_db(dbd, "real_escape");
s = String_val(str);
len = caml_string_length(str);
buf = (char*)caml_stat_alloc(2*len+1);
/*
* mysql_real_escape doesn't perform network I/O,
* so no need for blocking section (and extra copying)
* */
esclen = mysql_real_escape_string(mysql,buf,s,len);
res = caml_alloc_string(esclen);
memcpy(String_val(res), buf, esclen);
caml_stat_free(buf);
CAMLreturn(res);
}
EXTERNAL value
db_set_charset(value dbd, value str)
{
CAMLparam2(dbd, str);
char *s;
MYSQL *mysql;
int res;
mysql = check_db(dbd, "set_charset");
s = strdup(String_val(str));
caml_enter_blocking_section();
res = mysql_set_character_set(mysql,s);
free(s);
caml_leave_blocking_section();
if (res)
mysqlfailmsg("Mysql.set_charset : %s",mysql_error(mysql));
CAMLreturn(Val_unit);
}
/*
* db_size -- returns the size of the current result (number of rows).
*/
EXTERNAL value
db_size(value result)
{
CAMLparam1(result);
MYSQL_RES *res;
int64_t size;
res = RESval(result);
if (!res)
size = 0;
else
size = (int64_t)mysql_num_rows(res);
CAMLreturn(caml_copy_int64(size));
}
EXTERNAL value
db_affected(value dbd) {
CAMLparam1(dbd);
CAMLreturn(caml_copy_int64(mysql_affected_rows(DBDmysql(dbd))));
}
EXTERNAL value
db_insert_id(value dbd) {
CAMLparam1(dbd);
CAMLreturn(caml_copy_int64(mysql_insert_id(DBDmysql(dbd))));
}
EXTERNAL value
db_fields(value result)
{
MYSQL_RES *res;
long size;
res = RESval(result);
if (!res)
size = 0;
else
size = (long)(mysql_num_fields(res));
return Val_long(size);
}
EXTERNAL value
db_client_info(value unit) {
CAMLparam1(unit);
CAMLlocal1(info);
info = caml_copy_string(mysql_get_client_info());
CAMLreturn(info);
}
EXTERNAL value
db_host_info(value dbd) {
CAMLparam1(dbd);
CAMLlocal1(info);
info = caml_copy_string(mysql_get_host_info(DBDmysql(dbd)));
CAMLreturn(info);
}
EXTERNAL value
db_server_info(value dbd) {
CAMLparam1(dbd);
CAMLlocal1(info);
info = caml_copy_string(mysql_get_server_info(DBDmysql(dbd)));
CAMLreturn(info);
}
EXTERNAL value
db_proto_info(value dbd) {
long info = (long)mysql_get_proto_info(DBDmysql(dbd));
return Val_long(info);
}
/*
* type2dbty - maps column types to dbty values which describe the
* column types in OCaml.
*/
#define INT_TY 0
#define FLOAT_TY 1
#define STRING_TY 2
#define SET_TY 3
#define ENUM_TY 4
#define DATETIME_TY 5
#define DATE_TY 6
#define TIME_TY 7
#define YEAR_TY 8
#define TIMESTAMP_TY 9
#define UNKNOWN_TY 10
#define INT64_TY 11
#define BLOB_TY 12
#define DECIMAL_TY 13
static value
type2dbty (int type)
{
static struct {int mysql; value caml;} map[] = {
{FIELD_TYPE_DECIMAL , Val_long(DECIMAL_TY)},
{FIELD_TYPE_TINY , Val_long(INT_TY)},
{FIELD_TYPE_SHORT , Val_long(INT_TY)},
{FIELD_TYPE_LONG , Val_long(INT_TY)},
{FIELD_TYPE_FLOAT , Val_long(FLOAT_TY)},
{FIELD_TYPE_DOUBLE , Val_long(FLOAT_TY)},
{FIELD_TYPE_NULL , Val_long(STRING_TY)},
{FIELD_TYPE_TIMESTAMP , Val_long(TIMESTAMP_TY)},
{FIELD_TYPE_LONGLONG , Val_long(INT64_TY)},
{FIELD_TYPE_INT24 , Val_long(INT_TY)},
{FIELD_TYPE_DATE , Val_long(DATE_TY)},
{FIELD_TYPE_TIME , Val_long(TIME_TY)},
{FIELD_TYPE_DATETIME , Val_long(DATETIME_TY)},
{FIELD_TYPE_YEAR , Val_long(YEAR_TY)},
{FIELD_TYPE_NEWDATE , Val_long(UNKNOWN_TY)},
{FIELD_TYPE_ENUM , Val_long(ENUM_TY)},
{FIELD_TYPE_SET , Val_long(SET_TY)},
{FIELD_TYPE_TINY_BLOB , Val_long(BLOB_TY)},
{FIELD_TYPE_MEDIUM_BLOB , Val_long(BLOB_TY)},
{FIELD_TYPE_LONG_BLOB , Val_long(BLOB_TY)},
{FIELD_TYPE_BLOB , Val_long(BLOB_TY)},
{FIELD_TYPE_VAR_STRING , Val_long(STRING_TY)},
{FIELD_TYPE_STRING , Val_long(STRING_TY)},
{-1 /*default*/ , Val_long(UNKNOWN_TY)}
};
int i;
/* in principle using bsearch() would be better -- but how can
* we know that the left side of the map is properly sorted?
*/
for (i=0; map[i].mysql != -1 && map[i].mysql != type; i++)
/* empty */ ;
return map[i].caml;
}
value
make_field(MYSQL_FIELD *f) {
CAMLparam0();
CAMLlocal5(out, data, name, table, def);
name = caml_copy_string(f->name);
if (f->table)
table = val_str_option(f->table, strlen(f->table));
else
table = Val_none;
if (f->def)
def = val_str_option(f->def, strlen(f->def));
else
def = Val_none;
data = caml_alloc_small(7, 0);
Field(data, 0) = name;
Field(data, 1) = table;
Field(data, 2) = def;
Field(data, 3) = type2dbty(f->type);
Field(data, 4) = Val_long(f->max_length);
Field(data, 5) = Val_long(f->flags);
Field(data, 6) = Val_long(f->decimals);
CAMLreturn(data);
}
EXTERNAL value
db_fetch_field(value result) {
CAMLparam1(result);
CAMLlocal2(field, out);
MYSQL_FIELD *f;
MYSQL_RES *res = RESval(result);
if (!res)
CAMLreturn(Val_none);
f = mysql_fetch_field(res);
if (!f)
CAMLreturn(Val_none);
field = make_field(f);
CAMLreturn(Val_some(field));
}
EXTERNAL value
db_fetch_field_dir(value result, value pos) {
CAMLparam2(result, pos);
CAMLlocal2(field, out);
MYSQL_FIELD *f;
MYSQL_RES *res = RESval(result);
if (!res)
CAMLreturn(Val_none);
f = mysql_fetch_field_direct(res, Long_val(pos));
if (!f)
CAMLreturn(Val_none);
field = make_field(f);
CAMLreturn(Val_some(field));
}
EXTERNAL value
db_fetch_fields(value result) {
CAMLparam1(result);
CAMLlocal1(fields);
MYSQL_RES *res = RESval(result);
MYSQL_FIELD *f;
int i, n;
if (!res)
CAMLreturn(Val_none);
n = mysql_num_fields(res);
if (n == 0)
CAMLreturn(Val_none);
f = mysql_fetch_fields(res);
fields = caml_alloc_tuple(n);
for (i = 0; i < n; i++) {
Store_field(fields, i, make_field(f+i));
}
CAMLreturn(Val_some(fields));
}
static void
check_stmt(MYSQL_STMT* stmt, char *fun)
{
if (!stmt)
mysqlfailmsg("Mysql.Prepared.%s called with closed statement", fun);
}
static void
stmt_finalize(value v_stmt)
{
MYSQL_STMT* stmt = STMTval(v_stmt);
if (!stmt) return;
caml_enter_blocking_section();
mysql_stmt_close(stmt);
caml_leave_blocking_section();
STMTval(v_stmt) = (MYSQL_STMT*)NULL;
}
struct custom_operations stmt_ops = {
"Mysql Prepared Statement",
stmt_finalize,
custom_compare_default,
custom_hash_default,
custom_serialize_default,
custom_deserialize_default,
#if defined(custom_compare_ext_default)
custom_compare_ext_default,
#endif
};
EXTERNAL value
caml_mysql_stmt_prepare(value v_dbd, value v_sql)
{
CAMLparam2(v_dbd,v_sql);
CAMLlocal1(res);
int ret = 0;
MYSQL_STMT* stmt = NULL;
MYSQL* db = check_db(v_dbd, "Prepared.create");
char* sql_c = strdup(String_val(v_sql));
if (!sql_c)
mysqlfailwith("Mysql.Prepared.create : strdup");
caml_enter_blocking_section();
stmt = mysql_stmt_init(db);
if (!stmt)
{
free(sql_c);
caml_leave_blocking_section();
mysqlfailwith("Mysql.Prepared.create : mysql_stmt_init");
}
ret = mysql_stmt_prepare(stmt, sql_c, strlen(sql_c));
free(sql_c);
if (ret)
{
const char* err = mysql_stmt_error(stmt);
char buf[1024];
snprintf(buf, sizeof buf, "Mysql.Prepared.create : mysql_stmt_prepare = %i. Query : %s. Error : %s",ret,String_val(v_sql),err);
mysql_stmt_close(stmt);
caml_leave_blocking_section();
mysqlfailwith(buf);
}
caml_leave_blocking_section();
res = caml_alloc_custom(&stmt_ops, sizeof(MYSQL_STMT*), 0, 1);
STMTval(res) = stmt;
CAMLreturn(res);
}
EXTERNAL value
caml_mysql_stmt_close(value v_stmt)
{
CAMLparam1(v_stmt);
MYSQL_STMT* stmt = STMTval(v_stmt);
check_stmt(stmt,"close");
caml_enter_blocking_section();
mysql_stmt_close(stmt);
caml_leave_blocking_section();
STMTval(v_stmt) = (MYSQL_STMT*)NULL;
/*
* there is nothing we can do when connection is lost
* and anyway in this case the stmt is automatically released by the server
* so do not raise exception
*
* if (ret)
* mysqlfailmsg("mysql_stmt_close: %s", mysql_stmt_error(stmt));
*/
CAMLreturn(Val_unit);
}
typedef struct row_t_tag
{
size_t count;
MYSQL_STMT* stmt; /* not owned */
MYSQL_BIND* bind;
unsigned long* length;
my_bool* error;
my_bool* is_null;
} row_t;
row_t* create_row(MYSQL_STMT* stmt, size_t count)
{
row_t* row = malloc(sizeof(row_t));
if (row)
{
row->stmt = stmt;
row->count = count;
row->bind = calloc(count,sizeof(MYSQL_BIND));
row->error = calloc(count,sizeof(my_bool));
row->length = calloc(count,sizeof(unsigned long));
row->is_null = calloc(count,sizeof(my_bool));
}
return row;
}
void set_param_string(row_t *r, value v, int index)
{
MYSQL_BIND* bind = &r->bind[index];
size_t len = caml_string_length(v);
r->length[index] = len;
bind->length = &r->length[index];
bind->buffer_length = len;
bind->buffer_type = MYSQL_TYPE_STRING;
bind->buffer = malloc(len);
memcpy(bind->buffer, String_val(v), len);
}