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build and use a cache of field names for results

This commit is contained in:
Brian Lopez 2010-04-22 11:56:18 -07:00
parent aa9f435141
commit c05138e328
2 changed files with 35 additions and 26 deletions
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46
ext/mysql2_ext.c
View File

@ -273,7 +273,7 @@ static VALUE rb_mysql_result_to_obj(MYSQL_RES * r) {
obj = Data_Make_Struct(cMysql2Result, mysql2_result_wrapper, rb_mysql_result_mark, rb_mysql_result_free, wrapper);
wrapper->numberOfFields = 0;
wrapper->numberOfRows = 0;
wrapper->lastRow = 0;
wrapper->lastRowProcessed = 0;
wrapper->resultFreed = 0;
wrapper->result = r;
rb_obj_call_init(obj, 0, NULL);
@ -291,7 +291,7 @@ void rb_mysql_result_free(void * wrapper) {
void rb_mysql_result_mark(void * wrapper) {
mysql2_result_wrapper * w = wrapper;
if (w) {
rb_gc_mark(w->fieldList);
rb_gc_mark(w->fields);
rb_gc_mark(w->rows);
}
}
@ -300,9 +300,9 @@ static VALUE rb_mysql_result_fetch_row(int argc, VALUE * argv, VALUE self) {
VALUE rowHash, opts, block;
mysql2_result_wrapper * wrapper;
MYSQL_ROW row;
MYSQL_FIELD * fields;
MYSQL_FIELD * fields = NULL;
struct tm parsedTime;
unsigned int i = 0, numFields = 0, symbolizeKeys = 0;
unsigned int i = 0, symbolizeKeys = 0;
unsigned long * fieldLengths;
GetMysql2Result(self, wrapper);
@ -319,24 +319,34 @@ static VALUE rb_mysql_result_fetch_row(int argc, VALUE * argv, VALUE self) {
return Qnil;
}
numFields = mysql_num_fields(wrapper->result);
fieldLengths = mysql_fetch_lengths(wrapper->result);
fields = mysql_fetch_fields(wrapper->result);
if (wrapper->numberOfFields == 0) {
wrapper->numberOfFields = mysql_num_fields(wrapper->result);
wrapper->fields = rb_ary_new2(wrapper->numberOfFields);
}
rowHash = rb_hash_new();
for (i = 0; i < numFields; i++) {
VALUE key;
fields = mysql_fetch_fields(wrapper->result);
fieldLengths = mysql_fetch_lengths(wrapper->result);
for (i = 0; i < wrapper->numberOfFields; i++) {
// lazily create fields, but only once
// we'll use cached versions from here on out
VALUE field = rb_ary_entry(wrapper->fields, i);
if (field == Qnil) {
if (symbolizeKeys) {
char buf[fields[i].name_length+1];
memcpy(buf, fields[i].name, fields[i].name_length);
buf[fields[i].name_length] = 0;
key = ID2SYM(rb_intern(buf));
field = ID2SYM(rb_intern(buf));
} else {
key = rb_str_new(fields[i].name, fields[i].name_length);
field = rb_str_new(fields[i].name, fields[i].name_length);
#ifdef HAVE_RUBY_ENCODING_H
rb_enc_associate_index(key, utf8Encoding);
rb_enc_associate_index(field, utf8Encoding);
#endif
}
rb_ary_store(wrapper->fields, i, field);
}
if (row[i]) {
VALUE val;
switch(fields[i].type) {
@ -408,9 +418,9 @@ static VALUE rb_mysql_result_fetch_row(int argc, VALUE * argv, VALUE self) {
#endif
break;
}
rb_hash_aset(rowHash, key, val);
rb_hash_aset(rowHash, field, val);
} else {
rb_hash_aset(rowHash, key, Qnil);
rb_hash_aset(rowHash, field, Qnil);
}
}
return rowHash;
@ -425,7 +435,7 @@ static VALUE rb_mysql_result_each(int argc, VALUE * argv, VALUE self) {
rb_scan_args(argc, argv, "01&", &opts, &block);
if (wrapper->lastRow == 0) {
if (wrapper->lastRowProcessed == 0) {
wrapper->numberOfRows = mysql_num_rows(wrapper->result);
if (wrapper->numberOfRows == 0) {
return Qnil;
@ -433,7 +443,7 @@ static VALUE rb_mysql_result_each(int argc, VALUE * argv, VALUE self) {
wrapper->rows = rb_ary_new2(wrapper->numberOfRows);
}
if (wrapper->lastRow == wrapper->numberOfRows) {
if (wrapper->lastRowProcessed == wrapper->numberOfRows) {
// we've already read the entire dataset from the C result into our
// internal array. Lets hand that over to the user since it's ready to go
for (i = 0; i < wrapper->numberOfRows; i++) {
@ -449,7 +459,7 @@ static VALUE rb_mysql_result_each(int argc, VALUE * argv, VALUE self) {
} else {
row = rb_mysql_result_fetch_row(argc, argv, self);
rb_ary_store(wrapper->rows, i, row);
wrapper->lastRow++;
wrapper->lastRowProcessed++;
}
if (row == Qnil) {
@ -462,7 +472,7 @@ static VALUE rb_mysql_result_each(int argc, VALUE * argv, VALUE self) {
rb_yield(row);
}
}
if (wrapper->lastRow == wrapper->numberOfRows) {
if (wrapper->lastRowProcessed == wrapper->numberOfRows) {
// we don't need the mysql C dataset around anymore, peace it
rb_mysql_result_free(wrapper);
}

5
ext/mysql2_ext.h
View File

@ -44,12 +44,11 @@ void rb_mysql_client_free(void * client);
/* Mysql2::Result */
typedef struct {
VALUE fieldList;
VALUE fields;
VALUE rows;
unsigned long numberOfFields;
int *types;
unsigned long numberOfRows;
unsigned long lastRow;
unsigned long lastRowProcessed;
int resultFreed;
MYSQL_RES *result;
} mysql2_result_wrapper;