DATAJDBC-168 - Polishing.

Simplified initialization of MySql database.
Extracted dependency versions into properties.
Added JavaDoc.

pom.xml

@@ -24,10 +24,16 @@
 
 		<springdata.commons>2.1.0.BUILD-SNAPSHOT</springdata.commons>
 		<java-module-name>spring.data.jdbc</java-module-name>
-
 		<sonar.dynamicAnalysis>reuseReports</sonar.dynamicAnalysis>
-		<hsqldb1>1.8.0.10</hsqldb1>
 
+        <assertj-core.version>3.6.2</assertj-core.version>
+        <degraph-check.version>0.1.4</degraph-check.version>
+        <hsqldb.version>2.2.8</hsqldb.version>
+        <mybatis.version>3.4.4</mybatis.version>
+        <mybatis-spring.version>1.3.1</mybatis-spring.version>
+        <mysql.version>1.5.1</mysql.version>
+        <mysql-connector-java.version>5.1.41</mysql-connector-java.version>
+        <postgresql.version>42.0.0</postgresql.version>
     </properties>
 
 	<profiles>
@@ -137,63 +143,63 @@
 		<dependency>
 			<groupId>org.mybatis</groupId>
 			<artifactId>mybatis-spring</artifactId>
-			<version>1.3.1</version>
+			<version>${mybatis-spring.version}</version>
 			<optional>true</optional>
 		</dependency>
 
 		<dependency>
 			<groupId>org.mybatis</groupId>
 			<artifactId>mybatis</artifactId>
-			<version>3.4.4</version>
+			<version>${mybatis.version}</version>
 			<optional>true</optional>
 		</dependency>
 
 		<dependency>
 			<groupId>org.hsqldb</groupId>
 			<artifactId>hsqldb</artifactId>
-			<version>2.2.8</version>
+			<version>${hsqldb.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>org.assertj</groupId>
 			<artifactId>assertj-core</artifactId>
-			<version>3.6.2</version>
+			<version>${assertj-core.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>mysql</groupId>
 			<artifactId>mysql-connector-java</artifactId>
-			<version>5.1.41</version>
+			<version>${mysql-connector-java.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>org.postgresql</groupId>
 			<artifactId>postgresql</artifactId>
-			<version>42.0.0</version>
+			<version>${postgresql.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>de.schauderhaft.degraph</groupId>
 			<artifactId>degraph-check</artifactId>
-			<version>0.1.4</version>
+			<version>${degraph-check.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>org.testcontainers</groupId>
 			<artifactId>mysql</artifactId>
-			<version>1.5.1</version>
+			<version>${mysql.version}</version>
 			<scope>test</scope>
 		</dependency>
 
 		<dependency>
 			<groupId>org.testcontainers</groupId>
 			<artifactId>postgresql</artifactId>
-			<version>1.5.1</version>
+			<version>${mysql.version}</version>
 			<scope>test</scope>
 		</dependency>
 

src/test/java/org/springframework/data/jdbc/testing/MySqlDataSourceConfiguration.java

@@ -31,6 +31,8 @@ import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;
 /**
  * {@link DataSource} setup for MySQL.
  *
+ * Starts a docker container with a MySql database and sets up a database name "test" in it.
+ *
  * @author Jens Schauder
  * @author Oliver Gierke
  * @author Sedat Gokcen
@@ -39,10 +41,10 @@ import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;
 @Profile("mysql")
 class MySqlDataSourceConfiguration extends DataSourceConfiguration {
 
-	private static final MySQLContainer MYSQL_CONTAINER = new MySQLContainer();
+	private static final MySQLContainer MYSQL_CONTAINER = new MySQLContainer().withConfigurationOverride("");
 
 	static {
-		MYSQL_CONTAINER.withConfigurationOverride("mysql_cnf_override").withDatabaseName("test").start();
+		MYSQL_CONTAINER.start();
 	}
 
 	/*
@@ -52,7 +54,10 @@ class MySqlDataSourceConfiguration extends DataSourceConfiguration {
 	@Override
 	protected DataSource createDataSource() {
 
-		MysqlDataSource dataSource = getCommonDataSource();
+		MysqlDataSource dataSource = new MysqlDataSource();
+		dataSource.setUrl(MYSQL_CONTAINER.getJdbcUrl());
+		dataSource.setUser(MYSQL_CONTAINER.getUsername());
+		dataSource.setPassword(MYSQL_CONTAINER.getPassword());
 		dataSource.setDatabaseName(MYSQL_CONTAINER.getDatabaseName());
 
 		return dataSource;
@@ -60,18 +65,6 @@ class MySqlDataSourceConfiguration extends DataSourceConfiguration {
 
 	@PostConstruct
 	public void initDatabase() throws SQLException, ScriptException {
-
+		ScriptUtils.executeSqlScript(createDataSource().getConnection(), null, "DROP DATABASE test;CREATE DATABASE test;");
-		MysqlDataSource dataSource = getCommonDataSource();
-		ScriptUtils.executeSqlScript(dataSource.getConnection(), null, "DROP DATABASE test;CREATE DATABASE test;");
-	}
-
-	private MysqlDataSource getCommonDataSource() {
-
-		MysqlDataSource dataSource = new MysqlDataSource();
-		dataSource.setUrl(MYSQL_CONTAINER.getJdbcUrl());
-		dataSource.setUser(MYSQL_CONTAINER.getUsername());
-		dataSource.setPassword(MYSQL_CONTAINER.getPassword());
-
-		return dataSource;
 	}
 }

src/test/java/org/springframework/data/jdbc/testing/PostgresDataSourceConfiguration.java

@@ -24,7 +24,9 @@ import org.springframework.jdbc.datasource.init.ResourceDatabasePopulator;
 import org.testcontainers.containers.PostgreSQLContainer;
 
 /**
- * {@link DataSource} setup for PostgreSQL
+ * {@link DataSource} setup for PostgreSQL.
+ *
+ * Starts a docker container with a Postgres database.
  *
  * @author Jens Schauder
  * @author Oliver Gierke
@@ -47,12 +49,12 @@ public class PostgresDataSourceConfiguration extends DataSourceConfiguration {
 	@Override
 	protected DataSource createDataSource() {
 
-		PGSimpleDataSource ds = new PGSimpleDataSource();
+		PGSimpleDataSource dataSource = new PGSimpleDataSource();
-		ds.setUrl(POSTGRESQL_CONTAINER.getJdbcUrl());
+		dataSource.setUrl(POSTGRESQL_CONTAINER.getJdbcUrl());
-		ds.setUser(POSTGRESQL_CONTAINER.getUsername());
+		dataSource.setUser(POSTGRESQL_CONTAINER.getUsername());
-		ds.setPassword(POSTGRESQL_CONTAINER.getPassword());
+		dataSource.setPassword(POSTGRESQL_CONTAINER.getPassword());
 
-		return ds;
+		return dataSource;
 	}
 
 	/*

src/test/resources/mysql.cnf

@@ -0,0 +1,4 @@
+[mysqld]
+
+# the only change we make, other params with the comments all together are the default ones.
+lower_case_table_names = 1

src/test/resources/mysql_cnf_override/mysql.cnf

@@ -1,53 +0,0 @@
-[mysqld]
-
-# the only change we make, other params with the comments all together are the default ones.
-lower_case_table_names = 1
-
-user = mysql
-datadir = /var/lib/mysql
-port   		= 3306
-#socket 		= /tmp/mysql.sock
-skip-external-locking
-key_buffer_size = 16K
-max_allowed_packet = 1M
-table_open_cache = 4
-sort_buffer_size = 64K
-read_buffer_size = 256K
-read_rnd_buffer_size = 256K
-net_buffer_length = 2K
-skip-host-cache
-skip-name-resolve
-
-# Don't listen on a TCP/IP port at all. This can be a security enhancement,
-# if all processes that need to connect to mysqld run on the same host.
-# All interaction with mysqld must be made via Unix sockets or named pipes.
-# Note that using this option without enabling named pipes on Windows
-# (using the "enable-named-pipe" option) will render mysqld useless!
-#
-#skip-networking
-#server-id      	= 1
-
-# Uncomment the following if you want to log updates
-#log-bin=mysql-bin
-
-# binary logging format - mixed recommended
-#binlog_format=mixed
-
-# Causes updates to non-transactional engines using statement format to be
-# written directly to binary log. Before using this option make sure that
-# there are no dependencies between transactional and non-transactional
-# tables such as in the statement INSERT INTO t_myisam SELECT * FROM
-# t_innodb; otherwise, slaves may diverge from the master.
-#binlog_direct_non_transactional_updates=TRUE
-
-# Uncomment the following if you are using InnoDB tables
-innodb_data_file_path = ibdata1:10M:autoextend
-# You can set .._buffer_pool_size up to 50 - 80 %
-# of RAM but beware of setting memory usage too high
-innodb_buffer_pool_size = 16M
-#innodb_additional_mem_pool_size = 2M
-# Set .._log_file_size to 25 % of buffer pool size
-innodb_log_file_size = 5M
-innodb_log_buffer_size = 8M
-innodb_flush_log_at_trx_commit = 1
-innodb_lock_wait_timeout = 50