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statement.c
412 lines (350 loc) · 10.6 KB
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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 deallocate(void * ctx)
{
sqlite3StmtRubyPtr c = (sqlite3StmtRubyPtr)ctx;
xfree(c);
}
static VALUE allocate(VALUE klass)
{
sqlite3StmtRubyPtr ctx = xcalloc((size_t)1, sizeof(sqlite3StmtRuby));
ctx->st = NULL;
ctx->done_p = 0;
return Data_Wrap_Struct(klass, NULL, deallocate, ctx);
}
/* call-seq: SQLite3::Statement.new(db, sql)
*
* Create a new statement attached to the given Database instance, and which
* encapsulates the given SQL text. If the text contains more than one
* statement (i.e., separated by semicolons), then the #remainder property
* will be set to the trailing text.
*/
static VALUE initialize(VALUE self, VALUE db, VALUE sql)
{
sqlite3RubyPtr db_ctx;
sqlite3StmtRubyPtr ctx;
const char *tail = NULL;
int status;
Data_Get_Struct(db, sqlite3Ruby, db_ctx);
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
if(!db_ctx->db)
rb_raise(rb_eArgError, "prepare called on a closed database");
#ifdef HAVE_RUBY_ENCODING_H
if(!UTF8_P(sql)) {
VALUE encoding = rb_funcall(db, rb_intern("encoding"), 0);
rb_encoding * enc = NIL_P(encoding) ? rb_utf8_encoding() :
rb_to_encoding(encoding);
sql = rb_str_export_to_enc(sql, enc);
}
#endif
status = sqlite3_prepare_v2(
db_ctx->db,
(const char *)StringValuePtr(sql),
(int)RSTRING_LEN(sql),
&ctx->st,
&tail
);
CHECK(db_ctx->db, status);
rb_iv_set(self, "@connection", db);
rb_iv_set(self, "@remainder", rb_str_new2(tail));
rb_iv_set(self, "@columns", Qnil);
rb_iv_set(self, "@types", Qnil);
return self;
}
/* 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;
sqlite3 * db;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
db = sqlite3_db_handle(ctx->st);
CHECK(db, 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;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
if(!ctx->st) return Qtrue;
return Qfalse;
}
static VALUE step(VALUE self)
{
sqlite3StmtRubyPtr ctx;
sqlite3_stmt *stmt;
int value, length;
VALUE list;
#ifdef HAVE_RUBY_ENCODING_H
rb_encoding * internal_encoding;
int enc_index;
#endif
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
if(ctx->done_p) return Qnil;
#ifdef HAVE_RUBY_ENCODING_H
{
VALUE db = rb_iv_get(self, "@connection");
VALUE encoding = rb_funcall(db, rb_intern("encoding"), 0);
enc_index = NIL_P(encoding) ? rb_utf8_encindex() : rb_to_encoding_index(encoding);
internal_encoding = rb_default_internal_encoding();
}
#endif
stmt = ctx->st;
value = sqlite3_step(stmt);
length = sqlite3_column_count(stmt);
list = rb_ary_new2((long)length);
switch(value) {
case SQLITE_ROW:
{
int i;
for(i = 0; i < length; i++) {
switch(sqlite3_column_type(stmt, i)) {
case SQLITE_INTEGER:
rb_ary_push(list, LL2NUM(sqlite3_column_int64(stmt, i)));
break;
case SQLITE_FLOAT:
rb_ary_push(list, rb_float_new(sqlite3_column_double(stmt, i)));
break;
case SQLITE_TEXT:
{
VALUE str = rb_tainted_str_new(
(const char *)sqlite3_column_text(stmt, i),
(long)sqlite3_column_bytes(stmt, i)
);
#ifdef HAVE_RUBY_ENCODING_H
rb_enc_associate_index(str, enc_index);
if(internal_encoding)
str = rb_str_export_to_enc(str, internal_encoding);
#endif
rb_ary_push(list, str);
}
break;
case SQLITE_BLOB:
{
VALUE str = rb_tainted_str_new(
(const char *)sqlite3_column_blob(stmt, i),
(long)sqlite3_column_bytes(stmt, i)
);
rb_ary_push(list, str);
}
break;
case SQLITE_NULL:
rb_ary_push(list, Qnil);
break;
default:
rb_raise(rb_eRuntimeError, "bad type");
}
}
}
break;
case SQLITE_DONE:
ctx->done_p = 1;
return Qnil;
break;
default:
CHECK(sqlite3_db_handle(ctx->st), value);
}
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;
Data_Get_Struct(self, sqlite3StmtRuby, 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
#ifdef HAVE_RUBY_ENCODING_H
|| rb_enc_get_index(value) == rb_ascii8bit_encindex()
#endif
) {
status = sqlite3_bind_blob(
ctx->st,
index,
(const char *)StringValuePtr(value),
(int)RSTRING_LEN(value),
SQLITE_TRANSIENT
);
} else {
#ifdef HAVE_RUBY_ENCODING_H
if(!UTF8_P(value)) {
VALUE db = rb_iv_get(self, "@connection");
VALUE encoding = rb_funcall(db, rb_intern("encoding"), 0);
rb_encoding * enc = rb_to_encoding(encoding);
value = rb_str_export_to_enc(value, enc);
}
#endif
status = sqlite3_bind_text(
ctx->st,
index,
(const char *)StringValuePtr(value),
(int)RSTRING_LEN(value),
SQLITE_TRANSIENT
);
}
break;
case T_BIGNUM:
#if SIZEOF_LONG < 8
if (RBIGNUM_LEN(value) * SIZEOF_BDIGITS <= 8) {
status = sqlite3_bind_int64(ctx->st, index, (sqlite3_int64)NUM2LL(value));
break;
}
#endif
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
* occassionally be necessary to manually reset the statement.
*/
static VALUE reset_bang(VALUE self)
{
sqlite3StmtRubyPtr ctx;
int status;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
status = sqlite3_reset(ctx->st);
CHECK(sqlite3_db_handle(ctx->st), status);
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;
Data_Get_Struct(self, sqlite3StmtRuby, 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;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
return INT2NUM((long)sqlite3_column_count(ctx->st));
}
/* 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;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
name = sqlite3_column_name(ctx->st, (int)NUM2INT(index));
if(name) return rb_str_new2(name);
return Qnil;
}
/* 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;
Data_Get_Struct(self, sqlite3StmtRuby, 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;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
return INT2NUM((long)sqlite3_bind_parameter_count(ctx->st));
}
/* 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;
Data_Get_Struct(self, sqlite3StmtRuby, ctx);
REQUIRE_OPEN_STMT(ctx);
return SQLITE3_UTF8_STR_NEW2(
sqlite3_column_database_name(ctx->st, NUM2INT(index)));
}
void init_sqlite3_statement()
{
cSqlite3Statement = rb_define_class_under(mSqlite3, "Statement", rb_cObject);
rb_define_alloc_func(cSqlite3Statement, allocate);
rb_define_method(cSqlite3Statement, "initialize", initialize, 2);
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, "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, "database_name", database_name, 1);
}