Fixes the export of more than one entry through the connection option

Added ability to add server specific connection parameters
Using setCatalog instead of use database (recommended in mysql doc)

CHANGELOG.md

@@ -44,7 +44,7 @@ to [sourceforge feature requests](https://sourceforge.net/p/jabref/features/) by
 - Fixed [#710](https://github.com/JabRef/jabref/issues/710): Fixed quit behaviour under OSX
 - Merge from DOI now honors removed fields
 - Fixed [#778](https://github.com/JabRef/jabref/issues/778): Fixed NPE when exporting to .sql File
-
+- Fixed [#685](https://github.com/JabRef/jabref/issues/685): Fixed MySQL exporting for more than one entry
 
 ### Removed
 - Fixed [#627](https://github.com/JabRef/jabref/issues/627): The pdf field is removed from the export formats, use the file field

src/main/java/net/sf/jabref/sql/DBStrings.java

@@ -33,6 +33,7 @@ public class DBStrings {
     private String database;
     private String username;
     private String password;
+    private String dbParameters = "";
 
     private List<String> serverTypes;
     private boolean isInitialized;
@@ -123,6 +124,25 @@ public void isConfigValid(boolean confValid) {
         this.configValid = confValid;
     }
 
+    /**
+     * Returns the database parameters set
+     * @return dbParameters: The concatenated parameters
+     */
+    public String getDbParameters() {
+        return dbParameters;
+    }
+
+    /**
+     * Add server specific database parameter(s) <br>
+     * Multiple parameters must be concatenated in the format <br>
+     * {@code ?Parameter1=value&parameter2=value2}
+     * @param dbParameter The concatendated parameter
+     */
+    public void setDbParameters(String dbParameters) {
+        this.dbParameters = dbParameters;
+    }
+
+
     /**
      * Store these db strings into JabRef preferences.
      */
@@ -132,4 +152,6 @@ public void storeToPreferences() {
         Globals.prefs.put(JabRefPreferences.DB_CONNECT_DATABASE, getDatabase());
         Globals.prefs.put(JabRefPreferences.DB_CONNECT_USERNAME, getUsername());
     }
+
+
 }

src/main/java/net/sf/jabref/sql/SQLUtil.java

@@ -228,7 +228,7 @@ public static AutoCloseable processQueryWithResults(Object out, String query) th
     public static String createJDBCurl(DBStrings dbStrings, boolean withDBName) {
         String url;
         url = "jdbc:" + dbStrings.getServerType().toLowerCase() + "://" + dbStrings.getServerHostname()
-                + (withDBName ? '/' + dbStrings.getDatabase() : "");
+                + (withDBName ? '/' + dbStrings.getDatabase() : "") + dbStrings.getDbParameters();
         return url;
     }
 

src/main/java/net/sf/jabref/sql/exporter/MySQLExporter.java

@@ -36,6 +36,7 @@
 final public class MySQLExporter extends DBExporter {
 
     private static MySQLExporter instance;
+    private static String optAllowMultiQueries = "?allowMultiQueries=true";
 
 
     private MySQLExporter() {
@@ -55,15 +56,19 @@ public static MySQLExporter getInstance() {
     @Override
     public Connection connectToDB(DBStrings dbstrings) throws Exception {
         this.dbStrings = dbstrings;
+
+        dbStrings.setDbParameters(optAllowMultiQueries);
         String url = SQLUtil.createJDBCurl(dbstrings, false);
         String drv = "com.mysql.jdbc.Driver";
 
+
         Class.forName(drv).newInstance();
         Connection conn = DriverManager.getConnection(url,
                 dbstrings.getUsername(), dbstrings.getPassword());
         SQLUtil.processQuery(conn, "CREATE DATABASE IF NOT EXISTS `"
                 + dbStrings.getDatabase() + '`');
-        SQLUtil.processQuery(conn, "USE `" + dbStrings.getDatabase() + '`');
+
+        conn.setCatalog(dbStrings.getDatabase());
         return conn;
     }