I believe that you are asking how toINSERT new rows or UPDATE your existing rowsin one step. While that is possible in a single raw SQL as discussed inthis answer, I found that it easier to do this in two steps
insert("user",null, cv); 3、SQLiteDataBase对象的update()接口: publicintupdate (String table, ContentValues values, String whereClause, String[] whereArgs) Convenience methodforupdating rows in the database. Parameters table the table to update in(要更新的表名) values a map from column names ...
第一次调用getWritableDatabase()或getReadableDatabase()方法后,SQLiteOpenHelper会缓存当前的SQLiteDatabase实例,SQLiteDatabase实例正常情况下会维持数据库的打开状态,所以在你不再需要SQLiteDatabase实例时,请及时调用close()方法释放资源。一旦SQLiteDatabase实例被缓存,多次调用getWritableDatabase()或getReadableDatabase()方法得到...
在android开发中,我们常常用sqlite来存储用户信息,如何进行sqlite常规操作呢,请参阅下面的示例代码: package com.db.imgfornote; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.database.sqlite.SQ...
在android开发中,我们常常用sqlite来存储用户信息,如何进行sqlite常规操作呢,请参阅下面的示例代码: package com.db.imgfornote; import android.content.ContentValues; import android.content.Context; import android.database.Cursor; ...
import android.database.sqlite.SQLiteOpenHelper; import android.util.Log; public class DBHelper extends SQLiteOpenHelper { final private static String mDbName="imgfornote"; final private static int mDbVersion=1; private static DBHelper mInstance=null; ...
long android.database.sqlite.SQLiteDatabase.insert(String table, String nullColumnHack, ContentValues values) 参数介绍: table: 要插入数据的表的名称 nullColumnHack:当values参数为空或者里面没有内容的时候,我们insert是会失败的(底层数据库不允许插入一个空行),为了防止这种情况,我们要在这里指定一个列名,到时候...
About SQLiteUtils Quick Start: License About SQLiteUtils 一个简单的基于Android的Sqlite数据库的操作封装,它有如下的好处: 便捷地创建表和增添表字段 通过操作对象来insert或者update表记录 支持多种查询方式,支持分页查询 支持事务 Quick Start: 定义表对应的对象,对于基本类型,请使用对象类型来声明类成员,如int用...
InsertWithOnConflict InTransaction MarkTableSyncable NeedUpgrade OnAllReferencesReleased OpenDatabase OpenOrCreateDatabase Query QueryWithFactory RawQuery RawQueryWithFactory ReleaseMemory Replace ReplaceOrThrow SetCustomAggregateFunction SetCustomScalarFunction
update(SQLiteOpenHelper helper, Student student) { SQLiteDatabase db = helper.getWritableDatabase(); db.update(TABLE_NAME, toContentValues(student), StudentColumns.SID + " =? ", new String[] {student.id}); } /** * 插入新数据 * */ public static void insert(SQLiteOpenHelper helper, Student ...