Revert "try fix oracle connection issue"

This reverts commit f8386fe.

Author: vincentlauvlwj

ktorm-support-oracle/src/test/kotlin/org/ktorm/support/oracle/BaseOracleTest.kt

@@ -8,12 +8,8 @@ import java.sql.DriverManager
 import kotlin.concurrent.thread
 
 abstract class BaseOracleTest : BaseTest() {
-    lateinit var connection: Connection
 
     override fun init() {
-        Class.forName(driverClassName)
-        connection = DriverManager.getConnection(jdbcUrl, username, password)
-
         database = Database.connect(alwaysQuoteIdentifiers = true) {
             object : Connection by connection {
                 override fun close() {
@@ -27,10 +23,11 @@ abstract class BaseOracleTest : BaseTest() {
 
     override fun destroy() {
         execSqlScript("drop-oracle-data.sql")
-        connection.close()
     }
 
     companion object : OracleContainer("zerda/oracle-database:11.2.0.2-xe") {
+        lateinit var connection: Connection
+
         init {
             // At least 1 GB memory is required by Oracle.
             withCreateContainerCmdModifier { cmd -> cmd.hostConfig?.withShmSize((1 * 1024 * 1024 * 1024).toLong()) }
@@ -39,5 +36,17 @@ abstract class BaseOracleTest : BaseTest() {
             // Stop the container when the process exits.
             Runtime.getRuntime().addShutdownHook(thread(start = false) { stop() })
         }
+
+        override fun start() {
+            super.start()
+
+            Class.forName(driverClassName)
+            connection = DriverManager.getConnection(jdbcUrl, username, password)
+        }
+
+        override fun stop() {
+            connection.close()
+            super.stop()
+        }
     }
 }