Revert "db: increase db module level in vlib "

This reverts commit cd6d175180.

vlib/mysql/result.v

@@ -0,0 +1,120 @@
+module mysql
+
+pub struct Result {
+	result &MYSQL_RES
+}
+
+pub struct Row {
+pub mut:
+	vals []string
+}
+
+pub struct Field {
+	name             string
+	org_name         string
+	table            string
+	org_table        string
+	db               string
+	catalog          string
+	def              string
+	length           int
+	max_length       int
+	name_length      u32
+	org_name_length  u32
+	table_length     u32
+	org_table_length u32
+	db_length        u32
+	catalog_length   u32
+	def_length       u32
+	flags            u32
+	decimals         u32
+	charsetnr        u32
+	type_            FieldType
+}
+
+pub fn (r Result) fetch_row() &byteptr {
+	return mysql_fetch_row(r.result)
+}
+
+pub fn (r Result) num_fields() int {
+	return mysql_num_fields(r.result)
+}
+
+pub fn (r Result) rows() []Row {
+	mut rows := []Row
+	nr_cols := r.num_fields()
+	for rr := r.fetch_row(); rr; rr = r.fetch_row() {
+		mut row := Row{}
+		for i in 0..nr_cols {
+			if rr[i] == 0 {
+				row.vals << ''
+			} else {
+				row.vals << string(rr[i])
+			}
+		}
+		rows << row
+	}
+	return rows
+}
+
+pub fn (r Result) fetch_fields() []Field {
+	mut fields := []Field
+	nr_cols := r.num_fields()
+	orig_fields := mysql_fetch_fields(r.result)
+	for i in 0..nr_cols {
+		fields << Field{
+			name: string(orig_fields[i].name)
+			org_name: string(orig_fields[i].org_name)
+			table: string(orig_fields[i].table)
+			org_table: string(orig_fields[i].org_table)
+			db: string(orig_fields[i].db)
+			catalog: string(orig_fields[i].catalog)
+			def: resolve_nil_str(orig_fields[i].def)
+			length: orig_fields.length
+			max_length: orig_fields.max_length
+			name_length: orig_fields.name_length
+			org_name_length: orig_fields.org_name_length
+			table_length: orig_fields.table_length
+			org_table_length: orig_fields.org_table_length
+			db_length: orig_fields.db_length
+			catalog_length: orig_fields.catalog_length
+			def_length: orig_fields.def_length
+			flags: orig_fields.flags
+			decimals: orig_fields.decimals
+			charsetnr: orig_fields.charsetnr
+			type_: FieldType(orig_fields.@type)
+		}
+	}
+	return fields
+}
+
+pub fn (f Field) str() string {
+	return '
+{	
+	name: "$f.name"
+	org_name: "$f.org_name"
+	table: "$f.table"
+	org_table: "$f.org_table"
+	db: "$f.db"
+	catalog: "$f.catalog"
+	def: "$f.def"
+	length: $f.length
+	max_length: $f.max_length
+	name_length: $f.name_length
+	org_name_length: $f.org_name_length
+	table_length: $f.table_length
+	org_table_length: $f.org_table_length
+	db_length: $f.db_length
+	catalog_length: $f.catalog_length
+	def_length: $f.def_length
+	flags: $f.flags
+	decimals: $f.decimals
+	charsetnr: $f.charsetnr
+	type: ${f.type_.str()}
+}
+'
+}
+
+pub fn (r Result) free() {
+	mysql_free_result(r.result)
+}