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public class MySQLiteOpenHelper extends SQLiteOpenHelper { public String TableNames[]; public String FieldNames[][]; public String FieldTypes[][]; public static String NO_CREATE_TABLES = "no tables"; private String message = ""; public MySQLiteOpenHelper(Context context, String dbname, CursorFactory factory, int version, String tableNames[], String fieldNames[][], String fieldTypes[][]) { super(context, dbname, factory, version); TableNames = tableNames; FieldNames = fieldNames; FieldTypes = fieldTypes; } @Override public void onCreate(SQLiteDatabase db) { if (TableNames == null) { message = NO_CREATE_TABLES; return; } /* 建立table */ for (int i = 0; i < TableNames.length; i++) { String sql = "CREATE TABLE " + TableNames[i] + " ("; for (int j = 0; j < FieldNames[i].length; j++) { sql += FieldNames[i][j] + " " + FieldTypes[i][j] + ","; } sql = sql.substring(0, sql.length() - 1); sql += ")"; db.execSQL(sql); } } @Override public void onUpgrade(SQLiteDatabase db, int arg1, int arg2) { for (int i = 0; i < TableNames[i].length(); i++) { String sql = "DROP TABLE IF EXISTS " + TableNames[i]; db.execSQL(sql); } onCreate(db); } public void execSQL(String sql) throws java.sql.SQLException { SQLiteDatabase db = this.getWritableDatabase(); db.execSQL(sql); } /** * 查詢資料 * * @param table * 查詢的table name * @param columns * 查詢的資料的欄位名稱 * @param selection * 查詢條件字串 如:field1 = ? and field2 = ? * @param selectionArgs * 查詢條件的值 如:["a","b"] * @param groupBy * groupBy後面的字串 如:field1,field2 * @param having * having後面的字串 * @param orderBy * orderBy後面的字串 * @return Cursor 包含了取得的資料集 */ public Cursor select(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy) { SQLiteDatabase db = this.getReadableDatabase(); Cursor cursor = db.query(table, columns, selection, selectionArgs, groupBy, having, orderBy); return cursor; } /** * 新增資料 * * @param table * 新增資料的table name * @param fields * 新增資料的欄位名稱 * @param values * 新增資料的欄位值 * @return long row id */ public long insert(String table, String fields[], String values[]) { SQLiteDatabase db = this.getWritableDatabase(); /* 將新增的值放入ContentValues */ ContentValues cv = new ContentValues(); for (int i = 0; i < fields.length; i++) { cv.put(fields[i], values[i]); } return db.insert(table, null, cv); } /** * 刪除資料 * * @param table * 刪除資料的table name * @param where * 刪除資料的條件 * @param whereValue * 刪除資料的條件值 * @return int 刪除的筆數 */ public int delete(String table, String where, String[] whereValue) { SQLiteDatabase db = this.getWritableDatabase(); return db.delete(table, where, whereValue); } /** * 更新資料 * * @param table * 更新資料的table name * @param fields * 更新資料的欄位名稱 * @param values * 更新資料的欄位值 * @param where * 更新除資料的條件 * @param whereValue * 更新資料的條件值 * @return int 更新的筆數 */ public int update(String table, String updateFields[], String updateValues[], String where, String[] whereValue) { SQLiteDatabase db = this.getWritableDatabase(); /* 將修改的值放入ContentValues */ ContentValues cv = new ContentValues(); for (int i = 0; i < updateFields.length; i++) { cv.put(updateFields[i], updateValues[i]); } return db.update(table, cv, where, whereValue); } public String getMessage() { return message; } @Override public synchronized void close() { // TODO Auto-generated method stub super.close(); } }
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