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add create index if not exist method. #127

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add create index if not exist method. #127

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21 changes: 21 additions & 0 deletions src/main/java/com/j256/ormlite/table/TableUtils.java
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Original file line number Diff line number Diff line change
Expand Up @@ -243,6 +243,27 @@ public static <T> int clearTable(ConnectionSource connectionSource, DatabaseTabl
return clearTable(connectionSource, tableConfig.getTableName());
}


/**
* Create table indexes if they do not already exist. This is not supported by all databases.
*/
public static <T> void createIndexIfNotExists(ConnectionSource connectionSource, Class<T> dataClass)
throws SQLException {
Dao<T, ?> dao = DaoManager.createDao(connectionSource, dataClass);
doCreateIndex(dao, true);
}

private static <T, ID> void doCreateIndex(Dao<T, ID> dao, boolean ifNotExists) throws SQLException {
if (dao instanceof BaseDaoImpl<?, ?>) {
addCreateIndexStatements(dao.getConnectionSource().getDatabaseType(), ((BaseDaoImpl<?, ?>) dao).getTableInfo(), new ArrayList<String>(), ifNotExists, false);
addCreateIndexStatements(dao.getConnectionSource().getDatabaseType(), ((BaseDaoImpl<?, ?>) dao).getTableInfo(), new ArrayList<String>(), ifNotExists, true);
} else {
TableInfo<T, ID> tableInfo = new TableInfo<T, ID>(dao.getConnectionSource(), null, dao.getDataClass());
addCreateIndexStatements(dao.getConnectionSource().getDatabaseType(), tableInfo, new ArrayList<String>(), ifNotExists, false);
addCreateIndexStatements(dao.getConnectionSource().getDatabaseType(), tableInfo, new ArrayList<String>(), ifNotExists, true);
}
}

private static <T> int clearTable(ConnectionSource connectionSource, String tableName) throws SQLException {
DatabaseType databaseType = connectionSource.getDatabaseType();
StringBuilder sb = new StringBuilder(48);
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