public void batchInsertContains(int documentId, List<Integer> termIds) {
String sqlInsert =
"INSERT INTO contain_tbl(terms_id, documents_id, position_index)" + "VALUES(?, ?, ?)";
try (Connection connection = Database.getConnection(mConfig);
PreparedStatement preparedStatement = connection.prepareStatement(sqlInsert)) {
connection.setAutoCommit(false);
int positionId = 1;
int i = 0;
for (int termId : termIds) {
preparedStatement.setInt(1, termId);
preparedStatement.setInt(2, documentId);
preparedStatement.setInt(3, positionId);
preparedStatement.addBatch();
positionId++;
i++;
if (i % 1000 == 0 || i == termIds.size()) {
preparedStatement.executeBatch();
}
}
connection.commit();
} catch (SQLException ex) {
ex.printStackTrace();
}
}
public static boolean checkForTables(Configuration config) {
String sqlCheck = "SHOW TABLES";
try (Connection connection = Database.getConnection(config);
PreparedStatement preparedStatement = connection.prepareStatement(sqlCheck);
ResultSet res = preparedStatement.executeQuery()) {
res.last();
if (res.getRow() != 3) {
return false;
}
} catch (SQLException e) {
e.printStackTrace();
return false;
}
return true;
}
public static boolean initDatabase(Configuration config) {
try (Connection connection = Database.getConnection(config);
Statement statement = connection.createStatement()) {
Scanner s = new Scanner(FileUtil.getInputStreamFrom(PATH_TO_SQL_SCRIPT));
s.useDelimiter("(;(\r)?\n)|(--\n)");
while (s.hasNext()) {
String line = s.next();
if (line.startsWith("/*!") && line.endsWith("*/")) {
int i = line.indexOf(' ');
line = line.substring(i + 1, line.length() - " */".length());
}
if (line.trim().length() > 0) {
statement.execute(line);
}
}
} catch (SQLException | FileNotFoundException ex) {
ex.printStackTrace();
return false;
}
return true;
}
public static void main(String[] args) {
Database db = new Database("exampledb.db4o");
// Add some categories
db.addCategory("category1", "description1", false);
db.addCategory("category2", "description2", false);
db.addCategory("category3", "description3", false);
db.addCategory("deleteme", "description4", false);
// Get stored categories
List<String> categories = db.getCategoryNames();
listResult(categories);
System.out.println("--------------");
// Delete a category
db.deleteCategory("deleteme");
categories = db.getCategoryNames();
listResult(categories);
// Construct a list of categories
List<String> codeCategories = new ArrayList<String>();
codeCategories.add("category1");
codeCategories.add("category2");
// Add a code example
db.addCodeExample("myexample", "mydescription", "while (true)", "Java", codeCategories, false);
System.out.println("--------------");
// Get examples under a category name
// Note: This only returns code titles at the moment
List<String> examples = db.getExampleNames("category1");
listResult(examples);
// Get a CodeExample object from the database
List<CodeExample> examplelist = db.getExamplesByFieldValue("title", "myexample");
CodeExample codeexample = examplelist.get(0);
// Get the title
String title = codeexample.getTitle();
System.out.println("Title: " + title);
// Get the actual code
String code = codeexample.getCode();
System.out.println("Code: " + code);
// Get the description
String description = codeexample.getDescription();
System.out.println("Description: " + description);
// Get the language
String language = codeexample.getLanguage();
System.out.println("Language: " + language);
// Make sure to close the database when you're done
db.close();
}