Diploma Thesis Santiago Gómez Sáez - IAAS

7.2. Validation
5 "jdbc:mysql://" + "IPADDRESS" + ":3311/" + DB +"?allowMultiQueries=true;
cacheServerConfiguration=true&" +
6 "jdbcCompliantTruncation=false&zeroDateTimeBehavior=convertToNull&tinyInt1isBit=
false&allowMultiQueries=true&yearIsDateType=false",
7 TENANT_ID + "#" + USER_ID,"tenant1password");
8
10
11
9 ...
12 resultSet = executeQuery(connect, "select ID from customer; select * from mainInfoTest4;" +
13 "select * from mainInfoTest4 as t1, mainInfoTest1 as t2 where t1.ID = t2.ID;");
14 while (resultSet.next()) {
15 System.out.println("IDs " + resultSet.getInt("C_CUSTKEY"));
16 }
17 if (statement.getMoreResults()) {
18 ResultSet nextRs = statement.getResultSet();
19 while (nextRs.next()) {
20 System.out.println("ID_" + nextRs.getInt("ID"));
21 System.out.println("Name_" + nextRs.getString("Name"));
22 System.out.println("SecondName_" + nextRs.getString("SecondName"));
23 }
24 }
25 if (statement.getMoreResults()) {
26 ResultSet nextRs = statement.getResultSet();
27 while (nextRs.next()) {
28 System.out.println("ColumnCount:_" + nextRs.getMetaData().getColumnCount());
29 System.out.println("ID1_" + nextRs.getInt(1));
30 System.out.println("name_" + nextRs.getString(2));
31 System.out.println("SecondName_" + nextRs.getString(3));
32 System.out.println("ID2_" + nextRs.getInt(4));
33 System.out.println("name_" + nextRs.getString(5));
34 }
35 }
36
37 ...
Listing 7.4: Retrieve data via JDBC and MySQL protocol migrated to a backend Cloud
data store, or local database system.
In Listing 7.4 we provide part of a Java program which connects via the MySQL Connector/J
native driver with the MySQL CDASMix Proxy component on the port 3311. The options
attached to the connection URL must be set as in the provided code in order to increase the
performance of the communication, e.g. multi-querying for multiple queries in one statement,
cache server configuration in order not to request the server configuration data per request,
etc. In the MySQL request in Listing 7.4, the tenant operator authenticates with the tenant
and user UUID, and its password. Password is read in the system, but it is not compared in
the authentication process, as the CDASMix MySQL proxy does not implement the hashing
mechanisms of a MySQL server. After successful authentication, it executes a query which
contains multiple queries in the same request. Each query is processed independently in the
system when retrieving information from the different backend database systems, e.g. the
customer table is stored in Amazon RDS, while mainInfoTest4 and mainInfoTest1 are stored
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