/
statement.c
667 lines (568 loc) · 17.6 KB
/
statement.c
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#include <sqlite3_ruby.h>
#define REQUIRE_OPEN_STMT(_ctxt) \
if(!_ctxt->st) \
rb_raise(rb_path2class("SQLite3::Exception"), "cannot use a closed statement");
VALUE cSqlite3Statement;
static void
statement_deallocate(void *data)
{
sqlite3StmtRubyPtr s = (sqlite3StmtRubyPtr)data;
if (s->st) {
sqlite3_finalize(s->st);
}
xfree(data);
}
static size_t
statement_memsize(const void *data)
{
const sqlite3StmtRubyPtr s = (const sqlite3StmtRubyPtr)data;
// NB: can't account for s->st because the type is incomplete.
return sizeof(*s);
}
static const rb_data_type_t statement_type = {
"SQLite3::Backup",
{
NULL,
statement_deallocate,
statement_memsize,
},
0,
0,
RUBY_TYPED_FREE_IMMEDIATELY | RUBY_TYPED_WB_PROTECTED,
};
static VALUE
allocate(VALUE klass)
{
sqlite3StmtRubyPtr ctx;
return TypedData_Make_Struct(klass, sqlite3StmtRuby, &statement_type, ctx);
}
static VALUE
prepare(VALUE self, VALUE db, VALUE sql)
{
sqlite3RubyPtr db_ctx = sqlite3_database_unwrap(db);
sqlite3StmtRubyPtr ctx;
const char *tail = NULL;
int status;
StringValue(sql);
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
#ifdef HAVE_SQLITE3_PREPARE_V2
status = sqlite3_prepare_v2(
#else
status = sqlite3_prepare(
#endif
db_ctx->db,
(const char *)StringValuePtr(sql),
(int)RSTRING_LEN(sql),
&ctx->st,
&tail
);
CHECK(db_ctx->db, status);
timespecclear(&db_ctx->stmt_deadline);
return rb_utf8_str_new_cstr(tail);
}
/* call-seq: stmt.close
*
* Closes the statement by finalizing the underlying statement
* handle. The statement must not be used after being closed.
*/
static VALUE
sqlite3_rb_close(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
sqlite3_finalize(ctx->st);
ctx->st = NULL;
return self;
}
/* call-seq: stmt.closed?
*
* Returns true if the statement has been closed.
*/
static VALUE
closed_p(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
if (!ctx->st) { return Qtrue; }
return Qfalse;
}
static VALUE
step(VALUE self)
{
sqlite3StmtRubyPtr ctx;
sqlite3_stmt *stmt;
int value, length;
VALUE list;
rb_encoding *internal_encoding;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
if (ctx->done_p) { return Qnil; }
internal_encoding = rb_default_internal_encoding();
stmt = ctx->st;
value = sqlite3_step(stmt);
if (rb_errinfo() != Qnil) {
/* some user defined function was invoked as a callback during step and
* it raised an exception that has been suppressed until step returns.
* Now re-raise it. */
VALUE exception = rb_errinfo();
rb_set_errinfo(Qnil);
rb_exc_raise(exception);
}
length = sqlite3_column_count(stmt);
list = rb_ary_new2((long)length);
switch (value) {
case SQLITE_ROW: {
int i;
for (i = 0; i < length; i++) {
VALUE val;
switch (sqlite3_column_type(stmt, i)) {
case SQLITE_INTEGER:
val = LL2NUM(sqlite3_column_int64(stmt, i));
break;
case SQLITE_FLOAT:
val = rb_float_new(sqlite3_column_double(stmt, i));
break;
case SQLITE_TEXT: {
val = rb_utf8_str_new(
(const char *)sqlite3_column_text(stmt, i),
(long)sqlite3_column_bytes(stmt, i)
);
if (internal_encoding) {
val = rb_str_export_to_enc(val, internal_encoding);
}
rb_obj_freeze(val);
}
break;
case SQLITE_BLOB: {
val = rb_str_new(
(const char *)sqlite3_column_blob(stmt, i),
(long)sqlite3_column_bytes(stmt, i)
);
rb_obj_freeze(val);
}
break;
case SQLITE_NULL:
val = Qnil;
break;
default:
rb_raise(rb_eRuntimeError, "bad type");
}
rb_ary_store(list, (long)i, val);
}
}
break;
case SQLITE_DONE:
ctx->done_p = 1;
return Qnil;
break;
default:
sqlite3_reset(stmt);
ctx->done_p = 0;
CHECK(sqlite3_db_handle(ctx->st), value);
}
rb_obj_freeze(list);
return list;
}
/* call-seq: stmt.bind_param(key, value)
*
* Binds value to the named (or positional) placeholder. If +param+ is a
* Fixnum, it is treated as an index for a positional placeholder.
* Otherwise it is used as the name of the placeholder to bind to.
*
* See also #bind_params.
*/
static VALUE
bind_param(VALUE self, VALUE key, VALUE value)
{
sqlite3StmtRubyPtr ctx;
int status;
int index;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
switch (TYPE(key)) {
case T_SYMBOL:
key = rb_funcall(key, rb_intern("to_s"), 0);
case T_STRING:
if (RSTRING_PTR(key)[0] != ':') { key = rb_str_plus(rb_str_new2(":"), key); }
index = sqlite3_bind_parameter_index(ctx->st, StringValuePtr(key));
break;
default:
index = (int)NUM2INT(key);
}
if (index == 0) {
rb_raise(rb_path2class("SQLite3::Exception"), "no such bind parameter");
}
switch (TYPE(value)) {
case T_STRING:
if (CLASS_OF(value) == cSqlite3Blob
|| rb_enc_get_index(value) == rb_ascii8bit_encindex()
) {
status = sqlite3_bind_blob(
ctx->st,
index,
(const char *)StringValuePtr(value),
(int)RSTRING_LEN(value),
SQLITE_TRANSIENT
);
} else {
if (UTF16_LE_P(value) || UTF16_BE_P(value)) {
status = sqlite3_bind_text16(
ctx->st,
index,
(const char *)StringValuePtr(value),
(int)RSTRING_LEN(value),
SQLITE_TRANSIENT
);
} else {
if (!UTF8_P(value) || !USASCII_P(value)) {
value = rb_str_encode(value, rb_enc_from_encoding(rb_utf8_encoding()), 0, Qnil);
}
status = sqlite3_bind_text(
ctx->st,
index,
(const char *)StringValuePtr(value),
(int)RSTRING_LEN(value),
SQLITE_TRANSIENT
);
}
}
break;
case T_BIGNUM: {
sqlite3_int64 num64;
if (bignum_to_int64(value, &num64)) {
status = sqlite3_bind_int64(ctx->st, index, num64);
break;
}
}
case T_FLOAT:
status = sqlite3_bind_double(ctx->st, index, NUM2DBL(value));
break;
case T_FIXNUM:
status = sqlite3_bind_int64(ctx->st, index, (sqlite3_int64)FIX2LONG(value));
break;
case T_NIL:
status = sqlite3_bind_null(ctx->st, index);
break;
default:
rb_raise(rb_eRuntimeError, "can't prepare %s",
rb_class2name(CLASS_OF(value)));
break;
}
CHECK(sqlite3_db_handle(ctx->st), status);
return self;
}
/* call-seq: stmt.reset!
*
* Resets the statement. This is typically done internally, though it might
* occasionally be necessary to manually reset the statement.
*/
static VALUE
reset_bang(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
sqlite3_reset(ctx->st);
ctx->done_p = 0;
return self;
}
/* call-seq: stmt.clear_bindings!
*
* Resets the statement. This is typically done internally, though it might
* occasionally be necessary to manually reset the statement.
*/
static VALUE
clear_bindings_bang(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
sqlite3_clear_bindings(ctx->st);
ctx->done_p = 0;
return self;
}
/* call-seq: stmt.done?
*
* returns true if all rows have been returned.
*/
static VALUE
done_p(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
if (ctx->done_p) { return Qtrue; }
return Qfalse;
}
/* call-seq: stmt.column_count
*
* Returns the number of columns to be returned for this statement
*/
static VALUE
column_count(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
return INT2NUM(sqlite3_column_count(ctx->st));
}
#if HAVE_RB_ENC_INTERNED_STR_CSTR
static VALUE
interned_utf8_cstr(const char *str)
{
return rb_enc_interned_str_cstr(str, rb_utf8_encoding());
}
#else
static VALUE
interned_utf8_cstr(const char *str)
{
VALUE rb_str = rb_utf8_str_new_cstr(str);
return rb_funcall(rb_str, rb_intern("-@"), 0);
}
#endif
/* call-seq: stmt.column_name(index)
*
* Get the column name at +index+. 0 based.
*/
static VALUE
column_name(VALUE self, VALUE index)
{
sqlite3StmtRubyPtr ctx;
const char *name;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
name = sqlite3_column_name(ctx->st, (int)NUM2INT(index));
VALUE ret = Qnil;
if (name) {
ret = interned_utf8_cstr(name);
}
return ret;
}
/* call-seq: stmt.column_decltype(index)
*
* Get the column type at +index+. 0 based.
*/
static VALUE
column_decltype(VALUE self, VALUE index)
{
sqlite3StmtRubyPtr ctx;
const char *name;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
name = sqlite3_column_decltype(ctx->st, (int)NUM2INT(index));
if (name) { return rb_str_new2(name); }
return Qnil;
}
/* call-seq: stmt.bind_parameter_count
*
* Return the number of bind parameters
*/
static VALUE
bind_parameter_count(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
return INT2NUM(sqlite3_bind_parameter_count(ctx->st));
}
enum stmt_stat_sym {
stmt_stat_sym_fullscan_steps,
stmt_stat_sym_sorts,
stmt_stat_sym_autoindexes,
stmt_stat_sym_vm_steps,
#ifdef SQLITE_STMTSTATUS_REPREPARE
stmt_stat_sym_reprepares,
#endif
#ifdef SQLITE_STMTSTATUS_RUN
stmt_stat_sym_runs,
#endif
#ifdef SQLITE_STMTSTATUS_FILTER_MISS
stmt_stat_sym_filter_misses,
#endif
#ifdef SQLITE_STMTSTATUS_FILTER_HIT
stmt_stat_sym_filter_hits,
#endif
stmt_stat_sym_last
};
static VALUE stmt_stat_symbols[stmt_stat_sym_last];
static void
setup_stmt_stat_symbols(void)
{
if (stmt_stat_symbols[0] == 0) {
#define S(s) stmt_stat_symbols[stmt_stat_sym_##s] = ID2SYM(rb_intern_const(#s))
S(fullscan_steps);
S(sorts);
S(autoindexes);
S(vm_steps);
#ifdef SQLITE_STMTSTATUS_REPREPARE
S(reprepares);
#endif
#ifdef SQLITE_STMTSTATUS_RUN
S(runs);
#endif
#ifdef SQLITE_STMTSTATUS_FILTER_MISS
S(filter_misses);
#endif
#ifdef SQLITE_STMTSTATUS_FILTER_HIT
S(filter_hits);
#endif
#undef S
}
}
static size_t
stmt_stat_internal(VALUE hash_or_sym, sqlite3_stmt *stmt)
{
VALUE hash = Qnil, key = Qnil;
setup_stmt_stat_symbols();
if (RB_TYPE_P(hash_or_sym, T_HASH)) {
hash = hash_or_sym;
} else if (SYMBOL_P(hash_or_sym)) {
key = hash_or_sym;
} else {
rb_raise(rb_eTypeError, "non-hash or symbol argument");
}
#define SET(name, stat_type) \
if (key == stmt_stat_symbols[stmt_stat_sym_##name]) \
return sqlite3_stmt_status(stmt, stat_type, 0); \
else if (hash != Qnil) \
rb_hash_aset(hash, stmt_stat_symbols[stmt_stat_sym_##name], SIZET2NUM(sqlite3_stmt_status(stmt, stat_type, 0)));
SET(fullscan_steps, SQLITE_STMTSTATUS_FULLSCAN_STEP);
SET(sorts, SQLITE_STMTSTATUS_SORT);
SET(autoindexes, SQLITE_STMTSTATUS_AUTOINDEX);
SET(vm_steps, SQLITE_STMTSTATUS_VM_STEP);
#ifdef SQLITE_STMTSTATUS_REPREPARE
SET(reprepares, SQLITE_STMTSTATUS_REPREPARE);
#endif
#ifdef SQLITE_STMTSTATUS_RUN
SET(runs, SQLITE_STMTSTATUS_RUN);
#endif
#ifdef SQLITE_STMTSTATUS_FILTER_MISS
SET(filter_misses, SQLITE_STMTSTATUS_FILTER_MISS);
#endif
#ifdef SQLITE_STMTSTATUS_FILTER_HIT
SET(filter_hits, SQLITE_STMTSTATUS_FILTER_HIT);
#endif
#undef SET
if (!NIL_P(key)) { /* matched key should return above */
rb_raise(rb_eArgError, "unknown key: %"PRIsVALUE, rb_sym2str(key));
}
return 0;
}
/* call-seq: stmt.stats_as_hash(hash)
*
* Returns a Hash containing information about the statement.
*/
static VALUE
stats_as_hash(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
VALUE arg = rb_hash_new();
stmt_stat_internal(arg, ctx->st);
return arg;
}
/* call-seq: stmt.stmt_stat(hash_or_key)
*
* Returns a Hash containing information about the statement.
*/
static VALUE
stat_for(VALUE self, VALUE key)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
if (SYMBOL_P(key)) {
size_t value = stmt_stat_internal(key, ctx->st);
return SIZET2NUM(value);
} else {
rb_raise(rb_eTypeError, "non-symbol given");
}
}
#ifdef SQLITE_STMTSTATUS_MEMUSED
/* call-seq: stmt.memory_used
*
* Return the approximate number of bytes of heap memory used to store the prepared statement
*/
static VALUE
memused(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
return INT2NUM(sqlite3_stmt_status(ctx->st, SQLITE_STMTSTATUS_MEMUSED, 0));
}
#endif
#ifdef HAVE_SQLITE3_COLUMN_DATABASE_NAME
/* call-seq: stmt.database_name(column_index)
*
* Return the database name for the column at +column_index+
*/
static VALUE
database_name(VALUE self, VALUE index)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
return SQLITE3_UTF8_STR_NEW2(
sqlite3_column_database_name(ctx->st, NUM2INT(index)));
}
#endif
/* call-seq: stmt.sql
*
* Returns the SQL statement used to create this prepared statement
*/
static VALUE
get_sql(VALUE self)
{
sqlite3StmtRubyPtr ctx;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
return rb_obj_freeze(SQLITE3_UTF8_STR_NEW2(sqlite3_sql(ctx->st)));
}
/* call-seq: stmt.expanded_sql
*
* Returns the SQL statement used to create this prepared statement, but
* with bind parameters substituted in to the statement.
*/
static VALUE
get_expanded_sql(VALUE self)
{
sqlite3StmtRubyPtr ctx;
char *expanded_sql;
VALUE rb_expanded_sql;
TypedData_Get_Struct(self, sqlite3StmtRuby, &statement_type, ctx);
REQUIRE_OPEN_STMT(ctx);
expanded_sql = sqlite3_expanded_sql(ctx->st);
rb_expanded_sql = rb_obj_freeze(SQLITE3_UTF8_STR_NEW2(expanded_sql));
sqlite3_free(expanded_sql);
return rb_expanded_sql;
}
void
init_sqlite3_statement(void)
{
cSqlite3Statement = rb_define_class_under(mSqlite3, "Statement", rb_cObject);
rb_define_alloc_func(cSqlite3Statement, allocate);
rb_define_method(cSqlite3Statement, "close", sqlite3_rb_close, 0);
rb_define_method(cSqlite3Statement, "closed?", closed_p, 0);
rb_define_method(cSqlite3Statement, "bind_param", bind_param, 2);
rb_define_method(cSqlite3Statement, "reset!", reset_bang, 0);
rb_define_method(cSqlite3Statement, "clear_bindings!", clear_bindings_bang, 0);
rb_define_method(cSqlite3Statement, "step", step, 0);
rb_define_method(cSqlite3Statement, "done?", done_p, 0);
rb_define_method(cSqlite3Statement, "column_count", column_count, 0);
rb_define_method(cSqlite3Statement, "column_name", column_name, 1);
rb_define_method(cSqlite3Statement, "column_decltype", column_decltype, 1);
rb_define_method(cSqlite3Statement, "bind_parameter_count", bind_parameter_count, 0);
rb_define_method(cSqlite3Statement, "sql", get_sql, 0);
rb_define_method(cSqlite3Statement, "expanded_sql", get_expanded_sql, 0);
#ifdef HAVE_SQLITE3_COLUMN_DATABASE_NAME
rb_define_method(cSqlite3Statement, "database_name", database_name, 1);
#endif
#ifdef SQLITE_STMTSTATUS_MEMUSED
rb_define_method(cSqlite3Statement, "memused", memused, 0);
#endif
rb_define_private_method(cSqlite3Statement, "prepare", prepare, 2);
rb_define_private_method(cSqlite3Statement, "stats_as_hash", stats_as_hash, 0);
rb_define_private_method(cSqlite3Statement, "stat_for", stat_for, 1);
}