dh helpers: use NULL in reads from db

lib/database/Insert

@@ -36,7 +36,7 @@ Insert() {
 				"( $insert_values );" >&3
 	(( no_id )) || {
 		echo 'SELECT LAST_INSERT_ROWID();' >&3
-		read -u 4 results
+		read -u 4 -d$'\0' results
 		echo "$results"
 	}
 }

lib/database/Select

@@ -26,7 +26,7 @@ Select() {
 				"WHERE ${where_statement[@]})"	\
 			",'SQL::Select:not found'"		\
 		");" >&3
-	read -u 4 results
+	read -u 4 -d$'\0' results
 	if ! [[ $results == "SQL::Select:not found" ]]
 	then
 		echo "$results"

lib/database/upgradedatabase_1_2

@@ -18,11 +18,11 @@ FROM		destination_files;
 
 SELECT	"AtOM::NoMoreData";' >&3
 
-	read -u4 data
+	read -u4 -d$'\0' data
 	while [[ $data != AtOM::NoMoreData ]]
 	do
 		datas+=( "$data" )
-		read -u4 data
+		read -u4 -d$'\0' data
 	done
 	echo 'BEGIN TRANSACTION;' >&3
 	for data in "${datas[@]}"