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public class MigrationHelper {
private static final String CONVERSION_CLASS_NOT_FOUND_EXCEPTION = "MIGRATION HELPER - CLASS DOESN'T MATCH WITH THE CURRENT PARAMETERS"; private static MigrationHelper instance;
public static MigrationHelper getInstance() { if (instance == null) { instance = new MigrationHelper(); } return instance; }
public void migrate(Database db, Class<? extends AbstractDao<?, ?>>... daoClasses) { generateTempTables(db, daoClasses); DaoMaster.dropAllTables(db, true); DaoMaster.createAllTables(db, false); restoreData(db, daoClasses); }
public void contrastDiff(Database db,ArrayList<String>properties, Class<? extends AbstractDao<?, ?>>... daoClasses){ for(int i=0;i<daoClasses.length;i++){ DaoConfig daoConfig = new DaoConfig(db, daoClasses[i]); String tableName=daoConfig.tablename; if(properties!=null&&properties.size()>0){ ArrayList<String>tem=new ArrayList<>(); StringBuilder sqlBuilder=new StringBuilder(); for(int j=0;j<properties.size();j++){ if(getColumns(db,tableName).contains(properties.get(j))){ continue; } tem.add(properties.get(j)); } sqlBuilder.append("INSERT INTO ").append(tableName).append(" ("); sqlBuilder.append(TextUtils.join(",", tem)); sqlBuilder.append(") SELECT "); sqlBuilder.append(TextUtils.join(",", tem)); sqlBuilder.append(" FROM ").append(tableName).append(";"); db.execSQL(sqlBuilder.toString()); } } }
public void dropAndCreate(Database db){ DaoMaster.dropAllTables(db, true); DaoMaster.createAllTables(db, false); }
private void generateTempTables(Database db, Class<? extends AbstractDao<?, ?>>... daoClasses) { for (int i = 0; i < daoClasses.length; i++) { DaoConfig daoConfig = new DaoConfig(db, daoClasses[i]);
String divider = ""; String tableName = daoConfig.tablename; String tempTableName = daoConfig.tablename.concat("_TEMP"); ArrayList<String> properties = new ArrayList<>();
StringBuilder createTableStringBuilder = new StringBuilder();
createTableStringBuilder.append("CREATE TABLE ").append(tempTableName).append(" (");
for (int j = 0; j < daoConfig.properties.length; j++) { String columnName = daoConfig.properties[j].columnName;
if (getColumns(db, tableName).contains(columnName)) { properties.add(columnName);
String type = null;
try { type = getTypeByClass(daoConfig.properties[j].type); } catch (Exception exception) { }
createTableStringBuilder.append(divider).append(columnName).append(" ").append(type);
if (daoConfig.properties[j].primaryKey) { createTableStringBuilder.append(" PRIMARY KEY"); }
divider = ","; } } createTableStringBuilder.append(");");
db.execSQL(createTableStringBuilder.toString());
StringBuilder insertTableStringBuilder = new StringBuilder();
insertTableStringBuilder.append("INSERT INTO ").append(tempTableName).append(" ("); insertTableStringBuilder.append(TextUtils.join(",", properties)); insertTableStringBuilder.append(") SELECT "); insertTableStringBuilder.append(TextUtils.join(",", properties)); insertTableStringBuilder.append(" FROM ").append(tableName).append(";");
db.execSQL(insertTableStringBuilder.toString()); } }
private void restoreData(Database db, Class<? extends AbstractDao<?, ?>>... daoClasses) { for (int i = 0; i < daoClasses.length; i++) { DaoConfig daoConfig = new DaoConfig(db, daoClasses[i]);
String tableName = daoConfig.tablename; String tempTableName = daoConfig.tablename.concat("_TEMP"); ArrayList<String> properties = new ArrayList();
for (int j = 0; j < daoConfig.properties.length; j++) { String columnName = daoConfig.properties[j].columnName;
if (getColumns(db, tempTableName).contains(columnName)) { properties.add(columnName); } }
StringBuilder insertTableStringBuilder = new StringBuilder();
insertTableStringBuilder.append("INSERT INTO ").append(tableName).append(" ("); insertTableStringBuilder.append(TextUtils.join(",", properties)); insertTableStringBuilder.append(") SELECT "); insertTableStringBuilder.append(TextUtils.join(",", properties)); insertTableStringBuilder.append(" FROM ").append(tempTableName).append(";");
StringBuilder dropTableStringBuilder = new StringBuilder();
dropTableStringBuilder.append("DROP TABLE ").append(tempTableName);
db.execSQL(insertTableStringBuilder.toString()); db.execSQL(dropTableStringBuilder.toString()); } }
private String getTypeByClass(Class<?> type) throws Exception { if (type.equals(String.class)) { return "TEXT"; } if (type.equals(Long.class) || type.equals(Integer.class) || type.equals(long.class)) { return "INTEGER"; } if (type.equals(Boolean.class)) { return "BOOLEAN"; }
Exception exception = new Exception(CONVERSION_CLASS_NOT_FOUND_EXCEPTION.concat(" - Class: ").concat(type.toString())); throw exception; }
private static List<String> getColumns(Database db, String tableName) { List<String> columns = new ArrayList<>(); Cursor cursor = null; try { cursor = db.rawQuery("SELECT * FROM " + tableName + " limit 1", null); if (cursor != null) { columns = new ArrayList<>(Arrays.asList(cursor.getColumnNames())); } } catch (Exception e) { Log.v(tableName, e.getMessage(), e); e.printStackTrace(); } finally { if (cursor != null) cursor.close(); } return columns; } }
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