From: Roland Haeder <roland@mxchange.org>
Date: Wed, 29 Jul 2015 13:19:08 +0000 (+0200)
Subject: Having one database connection for all tables is more efficient
X-Git-Url: https://git.mxchange.org/?a=commitdiff_plain;h=15d31fb3c878ba93a7a8c2ce1d2ab3b16abf320f;p=addressbook-swing.git

Having one database connection for all tables is more efficient
Signed-off-by:Roland Häder <roland@mxchange.org>
---

diff --git a/Addressbook/src/org/mxchange/addressbook/database/backend/mysql/MySqlDatabaseBackend.java b/Addressbook/src/org/mxchange/addressbook/database/backend/mysql/MySqlDatabaseBackend.java
index 900d5a8..212a78e 100644
--- a/Addressbook/src/org/mxchange/addressbook/database/backend/mysql/MySqlDatabaseBackend.java
+++ b/Addressbook/src/org/mxchange/addressbook/database/backend/mysql/MySqlDatabaseBackend.java
@@ -38,7 +38,7 @@ public class MySqlDatabaseBackend extends BaseDatabaseBackend implements Databas
 	/**
 	 * An instance of a datbase connection
 	 */
-	private Connection connection;
+	private static Connection connection;
 
 	/**
 	 * Constructor with table name
@@ -59,6 +59,15 @@ public class MySqlDatabaseBackend extends BaseDatabaseBackend implements Databas
 		// Trace message
 		this.getLogger().trace("CALLED!"); //NOI18N
 
+		// Is the connection already there?
+		if (MySqlDatabaseBackend.connection instanceof Connection) {
+			// Already connected
+			this.getLogger().debug("Connection is already established."); //NOI18N
+
+			// No need to connect
+			return;
+		}
+
 		// Generate connection string
 		String connect = String.format("jdbc:mysql://%s/%s", //NOI18N
 				this.getProperty("org.mxchange.addressbook.database.mysql.host"), //NOI18N
@@ -69,7 +78,7 @@ public class MySqlDatabaseBackend extends BaseDatabaseBackend implements Databas
 		this.getLogger().debug(MessageFormat.format("Attempting to connect to {0} ...", connect)); //NOI18N
 
 		// Now get a connection instance back
-		this.connection = DriverManager.getConnection(
+		MySqlDatabaseBackend.connection = DriverManager.getConnection(
 				connect,
 				this.getProperty("org.mxchange.addressbook.database.mysql.login"), //NOI18N
 				this.getProperty("org.mxchange.addressbook.database.mysql.password") //NOI18N
@@ -87,11 +96,11 @@ public class MySqlDatabaseBackend extends BaseDatabaseBackend implements Databas
 	@Override
 	public void doShutdown () {
 		// This should not happen:
-		assert(this.connection == null) : "connection is null";
+		assert(MySqlDatabaseBackend.connection == null) : "connection is null"; //NOI18N
 
 		try {
 			// Close down database connection
-			this.connection.close();
+			MySqlDatabaseBackend.connection.close();
 		} catch (final SQLException ex) {
 			this.abortProgramWithException(ex);
 		}