DB schema updated to "7". Fixed #74.

resources/misc/db_init_mysql.sql

@@ -1,6 +1,6 @@
 DROP DATABASE IF EXISTS ##;
 -- !
-CREATE DATABASE IF NOT EXISTS ## CHARACTER SET utf8 COLLATE utf8_general_ci;
+CREATE DATABASE IF NOT EXISTS ## CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
 -- !
 USE ##;
 -- !

resources/misc/db_update_mysql_5_6.sql

@@ -1,4 +1,3 @@
--- !
 ALTER TABLE Messages
 ADD COLUMN custom_hash  TEXT;
 -- !

resources/misc/db_update_mysql_6_7.sql

@@ -0,0 +1,22 @@
+-- !
+ALTER DATABASE ##
+CHARACTER SET = utf8mb4
+COLLATE = utf8mb4_unicode_ci;
+-- !
+USE ##
+-- !
+ALTER TABLE messages
+CONVERT TO CHARACTER SET utf8mb4
+COLLATE utf8mb4_unicode_ci;
+-- !
+ALTER TABLE messages
+CHANGE title title TEXT
+CHARACTER SET utf8mb4
+COLLATE utf8mb4_unicode_ci;
+-- !
+ALTER TABLE messages
+CHANGE contents contents TEXT
+CHARACTER SET utf8mb4
+COLLATE utf8mb4_unicode_ci;
+-- !
+UPDATE Information SET inf_value = '7' WHERE inf_key = 'schema_version';

resources/misc/db_update_sqlite_6_7.sql

@@ -0,0 +1 @@
+UPDATE Information SET inf_value = '7' WHERE inf_key = 'schema_version';

resources/text/CHANGELOG

@@ -2,6 +2,7 @@
 —————
 
 Added:
+▪ MySQL database backend now requires at least version 5.5, DB encoding is now changed to utf8mb4 character set. (bug #74)
 ▪ Height if message attachment image is now configurable, defaults to 36. (issue #69)
 
 Changed:

src/definitions/definitions.h

@@ -109,7 +109,7 @@
 #define APP_DB_SQLITE_FILE            "database.db"
 
 // Keep this in sync with schema versions declared in SQL initialization code.
-#define APP_DB_SCHEMA_VERSION         "6"
+#define APP_DB_SCHEMA_VERSION         "7"
 #define APP_DB_UPDATE_FILE_PATTERN    "db_update_%1_%2_%3.sql"
 #define APP_DB_COMMENT_SPLIT          "-- !\n"
 #define APP_DB_WEB_PATH               "data/database/web"

src/miscellaneous/databasefactory.cpp

@@ -442,7 +442,7 @@ bool DatabaseFactory::sqliteUpdateDatabaseSchema(QSqlDatabase database, const QS
   return true;
 }
 
-bool DatabaseFactory::mysqlUpdateDatabaseSchema(QSqlDatabase database, const QString &source_db_schema_version) {
+bool DatabaseFactory::mysqlUpdateDatabaseSchema(QSqlDatabase database, const QString &source_db_schema_version, const QString &db_name) {
   int working_version = QString(source_db_schema_version).remove('.').toInt();
   const int current_version = QString(APP_DB_SCHEMA_VERSION).remove('.').toInt();
 
@@ -464,8 +464,8 @@ bool DatabaseFactory::mysqlUpdateDatabaseSchema(QSqlDatabase database, const QSt
 
     QStringList statements = QString(update_file_handle.readAll()).split(APP_DB_COMMENT_SPLIT, QString::SkipEmptyParts);
 
-    foreach (const QString &statement, statements) {
-      QSqlQuery query = database.exec(statement);
+    foreach (QString statement, statements) {
+      QSqlQuery query = database.exec(statement.replace(APP_DB_NAME_PLACEHOLDER, db_name));
 
       if (query.lastError().isValid()) {
         qFatal("Query for updating database schema failed: '%s'.", qPrintable(query.lastError().text()));
@@ -691,7 +691,7 @@ QSqlDatabase DatabaseFactory::mysqlInitializeDatabase(const QString &connection_
       const QString installed_db_schema = query_db.value(0).toString();
 
       if (installed_db_schema < APP_DB_SCHEMA_VERSION) {
-        if (mysqlUpdateDatabaseSchema(database, installed_db_schema)) {
+        if (mysqlUpdateDatabaseSchema(database, installed_db_schema, database_name)) {
           qDebug("Database schema was updated from '%s' to '%s' successully or it is already up to date.",
                  qPrintable(installed_db_schema),
                  APP_DB_SCHEMA_VERSION);

src/miscellaneous/databasefactory.h

@@ -135,7 +135,7 @@ class DatabaseFactory : public QObject {
     QSqlDatabase mysqlInitializeDatabase(const QString &connection_name);
 
     // Updates database schema.
-    bool mysqlUpdateDatabaseSchema(QSqlDatabase database, const QString &source_db_schema_version);
+    bool mysqlUpdateDatabaseSchema(QSqlDatabase database, const QString &source_db_schema_version, const QString &db_name);
 
     // Runs "VACUUM" on the database.
     bool mysqlVacuumDatabase();