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.
数据库文件在/data/data/<package name>/databases目录下。 sqlite中是不支持删除列操作的,所以网上 alter table [table_name] drop column [col_name] 这个语句在sqlite中是无效的(这不是MySQL),而替代的方法可以如下: 1.根据原表创建一张新表 2.删除原表 3.将新表重名为旧表的名称 慎用create table as ...
public override System.Data.DataTable GetSchema(string collectionName); Parameters collectionName String The name of the schema. Returns DataTable Schema information. Applies to Microsoft.Data.SQLite 9.0 和其他版本 产品版本 Microsoft.Data.SQLite 6.0, 7.0, 8.0, 9.0 GetSchema...
Table() { // As specified in NHibernate dialect return false; } @Override public boolean dropConstraints() { return false; } @Override public boolean qualifyIndexName() { return false; } @Override public String getAddColumnString() { return "add column"; } @Override public String getDrop...
Query the given table, returning a Cursor over the result set. C# 复制 [Android.Runtime.Register("query", "(Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;[Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)Landroid/database/Cursor;", "GetQuery_Ljava_lang_...
//TODO Auto-generated method stub String sql="DROP TABLE IF EXISTS"+TABLE_NAME; db.execSQL(sql); onCreate(db); } publicCursor select() { SQLiteDatabase db=this.getReadableDatabase(); Cursor cursor=db.query(TABLE_NAME,null,null,null,null,null,"_id desc"); ...
The select statement selects the required data from the database table, and if you want to fetch the selected data, thefetchall()method of the cursor object is used. We will demonstrate this in the next section. Fetch all data To fetch the data from a database, we will execute the SE...
DeleteDatabase DisableWriteAheadLogging EnableWriteAheadLogging EndTransaction ExecPerConnectionSQL ExecSQL FindEditTable Insert InsertOrThrow InsertWithOnConflict InTransaction MarkTableSyncable NeedUpgrade OnAllReferencesReleased OpenDatabase OpenOrCreateDatabase ...
方法返回Method 构造函数返回Constructor 注解返回Annotation 操作方法基本一致: package com.zlt.test1; import java.lang.reflect.*; /** * 用反射操作类 * @author Administrator * */ public class OpterClass { public static void main(String[] args) throws Exception { ...
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 ...