vlib: move the mysql/sqlite/pg/mssql modules under vlib/db (#16820)

vlib/db/mysql/_cdefs.c.v

@@ -0,0 +1,103 @@
+module mysql
+
+[typedef]
+struct C.MYSQL {
+}
+
+[typedef]
+struct C.MYSQL_RES {
+}
+
+[typedef]
+struct C.MYSQL_FIELD {
+	name             &u8 // Name of column
+	org_name         &u8 // Original column name, if an alias
+	table            &u8 // Table of column if column was a field
+	org_table        &u8 // Org table name, if table was an alias
+	db               &u8 // Database for table
+	catalog          &u8 // Catalog for table
+	def              &u8 // Default value (set by mysql_list_fields)
+	length           int // Width of column (create length)
+	max_length       int // Max width for selected set
+	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 // Div flags
+	decimals         u32 // Number of decimals in field
+	charsetnr        u32 // Character set
+	@type            int // Type of field. See mysql_com.h for types
+}
+
+fn C.mysql_init(mysql &C.MYSQL) &C.MYSQL
+
+fn C.mysql_real_connect(mysql &C.MYSQL, host &char, user &char, passwd &char, db &char, port u32, unix_socket &char, client_flag ConnectionFlag) &C.MYSQL
+
+fn C.mysql_query(mysql &C.MYSQL, q &u8) int
+
+fn C.mysql_use_result(mysql &C.MYSQL)
+
+fn C.mysql_real_query(mysql &C.MYSQL, q &u8, len u32) int
+
+fn C.mysql_select_db(mysql &C.MYSQL, db &u8) int
+
+fn C.mysql_change_user(mysql &C.MYSQL, user &u8, password &u8, db &u8) bool
+
+fn C.mysql_affected_rows(mysql &C.MYSQL) u64
+
+fn C.mysql_options(mysql &C.MYSQL, option int, arg voidptr) int
+
+fn C.mysql_get_option(mysql &C.MYSQL, option int, arg voidptr) int
+
+fn C.mysql_list_tables(mysql &C.MYSQL, wild &u8) &C.MYSQL_RES
+
+fn C.mysql_num_fields(res &C.MYSQL_RES) int
+
+fn C.mysql_num_rows(res &C.MYSQL_RES) u64
+
+fn C.mysql_autocommit(mysql &C.MYSQL, mode bool)
+
+fn C.mysql_refresh(mysql &C.MYSQL, options u32) int
+
+fn C.mysql_reset_connection(mysql &C.MYSQL) int
+
+fn C.mysql_ping(mysql &C.MYSQL) int
+
+fn C.mysql_store_result(mysql &C.MYSQL) &C.MYSQL_RES
+
+fn C.mysql_fetch_row(res &C.MYSQL_RES) &&u8
+
+fn C.mysql_fetch_fields(res &C.MYSQL_RES) &C.MYSQL_FIELD
+
+fn C.mysql_free_result(res &C.MYSQL_RES)
+
+fn C.mysql_real_escape_string(mysql &C.MYSQL, to &u8, from &u8, len u64) u64
+
+// fn C.mysql_real_escape_string_quote(mysql &C.MYSQL, to &byte, from &byte, len u64, quote byte) u64 (Don't exist in mariadb)
+
+fn C.mysql_close(sock &C.MYSQL)
+
+// INFO & VERSION
+fn C.mysql_info(mysql &C.MYSQL) &u8
+
+fn C.mysql_get_host_info(mysql &C.MYSQL) &u8
+
+fn C.mysql_get_server_info(mysql &C.MYSQL) &u8
+
+fn C.mysql_get_server_version(mysql &C.MYSQL) u64
+
+fn C.mysql_get_client_version() u64
+
+fn C.mysql_get_client_info() &u8
+
+// DEBUG & ERROR INFO
+fn C.mysql_error(mysql &C.MYSQL) &u8
+
+fn C.mysql_errno(mysql &C.MYSQL) int
+
+fn C.mysql_dump_debug_info(mysql &C.MYSQL) int
+
+fn C.mysql_debug(debug &u8)