publicvoidclearTable(StringtableName){SQLiteDatabasedb=this.getWritableDatabase();db.execSQL("DELETE FROM "+tableName);db.close();} 1. 2. 3. 4. 5. 在这段代码中,我们首先获取一个可写的数据库对象SQLiteDatabase,然后执行一个DELETE语句来删除表中的所有数据。最后关闭数据库连接。 示例 下面是一个...
SQLite TRUNCATE TABLE 清空表 SQLite清空表代替Mysql中TRUNCATE TABLE的方法如何清空SQLIte表中的数据 并且自增长id 还原为 1?在SQlite 中的解决方案:delete from '表名'; select * from sqlite_sequence; update sqlite_sequence set seq=0 where name='表名'; TRUNCATE TABLE 清空表 sqlite 表名 数据 ...
sqlite3BtreeCreateTable: Creates anew, empty B-treeina database file.sqlite3BtreeDropTable: Destroys a B-treeina database file. sqlite3BtreeClearTable: Removes all datafroma B-tree, but keeps the B-tree intact. 3.6.3、游标函数(Cursor Functions) sqlite3BtreeCursor: Creates anewcursor pointing...
- (void)clearDB; @end DataBaseHandle.m文件 #import "DBHandle.h" //创建代理对象 static DBHandle *dataBase = nil; @interface DBHandle () //保存数据库路径 @property (nonatomic, copy)NSString *dataBasePath; @end @implementation DBHandle <h2> 实现数据库操作的方法</h2> //初始化单例类对...
public void clearFeedTable(){ String sql = "DELETE FROM " + FEED_TABLE_NAME +";"; SQLiteDatabase db = dbHelper.getSQLiteDatabase(); db.execSQL(sql); revertSeq(); dbHelper.free(); } private void revertSeq() { String sql = "update sqlite_sequence set seq=0 where name='"+FEED_...
CREATE TABLE CREATE TRIGGER CREATE VIEW DELETE DETACH DATABASE DROP INDEX DROP TABLE DROP TRIGGER DROP VIEW ENDTRANSACTION EXPLAIN expression INSERT ONCONFLICT clause PRAGMA REPLACE ROLLBACK TRANSACTION SELECT UPDATE 同时它还支持事务处理功能等等。也有人说它象Microsoft的Access,有时候真的觉得有点象,但是事...
SQLiteDatabasedb=dbHelper.getWritableDatabase();//指定delete方法db.delete("Book","pages > ?",newString[]{"500"}); 查询删除后的数据: 删除数据 查询数据 SQLiteDatabase对象中有多个重载的query()方法,使用一个最简单的方法(七个参数): query(Stringtable,String[]columns,Stringselection,String[]selectionA...
=null){ mInstance.databases.get(i).close(); } } mInstance.databases.clear(); } } }2 在MainActivity中，写入操作代码package com.zk.outdatabase;import java.util.HashMap;import java.util.Iterator;import java.util.Map;import java.util.Set;import com.zhangkai.sqlitedatabase.D...
sql_query.exec("create table student (id int primary key, name varchar(30), age int)"); 创建表格语句:create table <table_name> (f1 type1, f2 type2,…); create table是创建表格的语句,也可用大写CREATE TABLE;student是表格的名称,可以任意取;括号中是表格的格式,上述指令表明,表格中有三列,第...
DROP TABLE database_name.table_name; 记录的增删改查 增 指定列: INSERT INTO TABLE_NAME [(column1, column2, column3,...columnN)] VALUES (value1, value2, value3,...valueN); 所有列: INSERT INTO TABLE_NAME VALUES (value1,value2,value3,...valueN); 删 DELETE FROM table_name WHERE ...