import android.content.ContentValues;import android.content.Context;import android.database.Cursor;import android.database.sqlite.SQLiteDatabase;import android.database.sqlite.SQLiteOpenHelper;import android.util.Log;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;/** * Created by Ice on 2017/4/11. * The abstract class is base utils in you extends this. * You can use it when hand with database. * In createTable() method to create tables * In upGradeDatabase() update your database of tables. */public abstract class BaseDatabase { private final String TAG = "RRL"; private DbSQLiteOpenHelper helper; private String databaseName; private int databaseVersion; private Context context; /** * 基础的数据库构造方法 * This Construction method have default database name * and default database version . If you want to defined * database name and database version ,please chose other * construction. * * @param context */ public BaseDatabase(Context context) { this.context = context; databaseName = "AndroidSQLite"; databaseVersion = 1; helper = new DbSQLiteOpenHelper(context, databaseName, null, databaseVersion); } /** * 自定义数据库名称及路劲和版本的构造方法 * This Construction method you can defined * database name and database version. * * @param context * @param databaseName if you want to defined you database path * you should add a path before of database name. * @param databaseVersion you should upgrade you database when version change */ public BaseDatabase(Context context, String databaseName, int databaseVersion) { this.context = context; helper = new DbSQLiteOpenHelper(context, databaseName, null, databaseVersion); } /** * 创建数据表 * create table * for example create table if not exists user (_id integer primary key autoincrement,user_name text,user_sex text,user_pwd text) * * @param db */ public abstract void createTable(SQLiteDatabase db); /** * 升级数据库 * update grade database * [newVersion > oldVersion] for example drop table user * * @param db open or write to database object * @param oldVersion * @param newVersion */ public abstract void upGradeDatabase(SQLiteDatabase db, int oldVersion, int newVersion); /** * 插入数据 * insert you want what information. * * @param table * @param contentValues * @return */ public long insert(String table, ContentValues contentValues) { long result = -1; SQLiteDatabase db = helper.getWritableDatabase(); db.beginTransaction(); try { result = db.insert(table, null, contentValues); db.setTransactionSuccessful(); } catch (Exception e) { Log.i(TAG, this.getClass().getSimpleName() + " insert Exception" + e.toString()); } db.endTransaction(); helper.close(); return result; } /** * 插入数据 * insert you want what information. * * @param sql * @return */ public void insert(String sql) { execSQL(sql); } /** * 删除数据 * delete from database what you want to do anything. * * @param table * @param whereClause for example "name = ?" * @param whereArgs for example new String[]{"Marry"} * @return */ public long delete(String table, String whereClause, String[] whereArgs) { long result = -1; SQLiteDatabase db = helper.getWritableDatabase(); db.beginTransaction(); try { result = db.delete(table, whereClause, whereArgs); db.setTransactionSuccessful(); } catch (Exception e) { Log.i(TAG, this.getClass().getSimpleName() + " delete Exception" + e.toString()); } db.endTransaction(); helper.close(); return result; } /** * 删除数据 * delete from database what you want to do anything. * * @param sql * @return */ public void delete(String sql) { execSQL(sql); } /** * 更新数据 * update from your table in database. * * @param table * @param contentValues you is gonging to update values * @param whereClause for example "name = ?" * @param whereArgs for example new String[]{"Marry"} * @return */ public long update(String table, ContentValues contentValues, String whereClause, String[] whereArgs) { long result = -1; SQLiteDatabase db = helper.getWritableDatabase(); db.beginTransaction(); try { result = db.update(table, contentValues, whereClause, whereArgs); db.setTransactionSuccessful(); } catch (Exception e) { Log.i(TAG, this.getClass().getSimpleName() + " update Exception" + e.toString()); } db.endTransaction(); helper.close(); return result; } /** * 更新数据 * update from your table in database. * for example update user set user_name = 'Jerry' where user_name = 'Marry' * * @param sql * @return */ public void update(String sql) { execSQL(sql); } /** * 查询数据 * query from databases and find you what you are gong to finding. * * @param sql * @return */ public List<Map<String, String>> query(String sql) { SQLiteDatabase db = helper.getReadableDatabase(); Cursor cursor = db.rawQuery(sql, null); String[] columnNames = cursor.getColumnNames(); Log.e(TAG, this.getClass().getSimpleName() + " query sql:" + sql + ",column count:" + cursor.getCount() + ",column length:" + columnNames.length); List<Map<String, String>> queryList = new ArrayList<Map<String, String>>(); while (cursor.moveToNext()) { Map<String, String> map = new HashMap<>(); for (int i = 0; i < columnNames.length; i++) { map.put(columnNames[i], cursor.getString(cursor.getColumnIndex(columnNames[i]))); } queryList.add(map); } cursor.close(); helper.close(); return queryList; } /** * 执行SQL语句 * CMD SQL * * @param sql */ public void execSQL(String sql) { Log.e(TAG, this.getClass().getSimpleName() + " execSQL sql:" + sql); SQLiteDatabase db = helper.getWritableDatabase(); db.beginTransaction(); try { db.execSQL(sql); db.setTransactionSuccessful();//Notice:if you beginTransaction() method and endTransaction() method you must use this method.if you don't while your data insert、update、delete fail. } catch (Exception e) { Log.e(TAG, this.getClass().getSimpleName() + " execSQL Exception:" + e.toString()); } db.endTransaction(); helper.close(); } /** * 删除表 * drop table * * @param table */ public void dropTable(String table) { SQLiteDatabase db = helper.getWritableDatabase(); db.beginTransaction(); String sql = "drop table " + table; try { db.execSQL(sql); Log.e(TAG, this.getClass().getSimpleName() + " dropTable sql:" + sql); db.setTransactionSuccessful();//Notice:if you beginTransaction() method and endTransaction() method you must use this method.if you don't while your data insert、update、delete fail. } catch (Exception e) { Log.e(TAG, this.getClass().getSimpleName() + " execSQL Exception:" + e.toString()); } db.endTransaction(); helper.close(); } /** * 清除表中数据 * truncate table * * @param table */ public void deleteTable(String table) { SQLiteDatabase db = helper.getWritableDatabase(); db.beginTransaction(); //除去表内的数据，但并不删除表本身 String sql = "delete from " + table; try { db.execSQL(sql); Log.e(TAG, this.getClass().getSimpleName() + " dropTable sql:" + sql); db.setTransactionSuccessful();//Notice:if you beginTransaction() method and endTransaction() method you must use this method.if you don't while your data insert、update、delete fail. } catch (Exception e) { Log.e(TAG, this.getClass().getSimpleName() + " execSQL Exception:" + e.toString()); } db.endTransaction(); helper.close(); } /** * 删除数据库 * delete database */ public void dropDatabase() { context.deleteDatabase(helper.getDatabaseName()); Log.e(TAG, this.getClass().getSimpleName() + " dropDatabase databaseName:" + helper.getDatabaseName()); } /** * 数据库操作对象类 * The handel with database object class */ private class DbSQLiteOpenHelper extends SQLiteOpenHelper { public DbSQLiteOpenHelper(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) { super(context, name, factory, version); } @Override public void onCreate(SQLiteDatabase db) { createTable(db); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { upGradeDatabase(db, oldVersion, newVersion); } }}
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