Android 个人理财工具二：使用SQLite实现启动时初始化数据

static SQLiteDatabase openOrCreateDatabase(String path, SQLiteDatabase.CursorFactory factory) //打开数据库 Cursor query(String table, String[] columns, String selection, String[] selectionArgs, String groupBy, String having, String orderBy, String limit) //执行查询SQL void execSQL(String sql) //执行非查询sql 

//执行select type,name from sqlite_master where name='colaconfig' String col[] = {"type", "name" };  Cursor c =db.query("sqlite_master", col, "name='colaconfig'", null, null, null, null);  int n=c.getCount(); //执行多表查询 //select fee,desc from acctite a,bills b where a.id=b.id String col2[] = {"fee", "desc" }; Cursor c2 =db.query("acctitem a,bills b", col, "a.id=b.id", null, null, null, null); int n2=c2.getCount(); Log.v("cola","c2.getCount="+n2+"");  c2.moveToFirst(); int k = 0; while(!c2.isAfterLast()){  String ss = c2.getString(0) +", "+ c2.getString(1);   c2.moveToNext();    Log.v("cola","ss="+ss+""); } 

public void initApp(){  BilldbHelper billdb=new BilldbHelper(this);  billdb.FirstStart();  billdb.close(); } 

package com.cola.ui; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.util.Log; /**  * Provides access to a database of notes. Each note has a title, the note  * itself, a creation date and a modified data.  */ public class BilldbHelper {  private static final String TAG = "Cola_BilldbHelper";  private static final String DATABASE_NAME = "cola.db";   SQLiteDatabase db;  Context context;   BilldbHelper(Context _context) {  context=_context;  db=context.openOrCreateDatabase(DATABASE_NAME, 0, null); //创建数据库  Log.v(TAG,"db path="+db.getPath());  }   public void CreateTable_acctitem() {  try{  db.execSQL("CREATE TABLE acctitem (" //创建账目表   + "ID INTEGER PRIMARY KEY,"   + "PID integer,"   + "NAME TEXT,"   + "TYPE INTEGER"    + ");");  Log.v("cola","Create Table acctitem ok");  }catch(Exception e){  Log.v("cola","Create Table acctitem err,table exists.");  }  }   public void CreateTable_bills() {  try{  db.execSQL("CREATE TABLE bills ("   + "ID INTEGER PRIMARY KEY,"   + "fee integer,"   + "userid integer,"   + "sdate TEXT,"   + "stime TEXT,"   + "desc TEXT"    + ");");  Log.v("cola","Create Table acctitem ok");  }catch(Exception e){  Log.v("cola","Create Table acctitem err,table exists.");  }  }   public void CreateTable_colaconfig() {  try{  db.execSQL("CREATE TABLE colaconfig ("   + "ID INTEGER PRIMARY KEY,"   + "NAME TEXT"   + ");");  Log.v("cola","Create Table colaconfig ok");  }catch(Exception e){  Log.v("cola","Create Table acctitem err,table exists.");  }  }   public void InitAcctitem() {   db.execSQL("insert into acctitem values (100,0,'收入',0)");  db.execSQL("insert into acctitem values (100100,100,'工资',0)");  db.execSQL("insert into acctitem values (200,0,'支出',1)");  db.execSQL("insert into acctitem values (200100,200,'生活用品',1)");  db.execSQL("insert into acctitem values (200101,200,'水电煤气费',1)");  db.execSQL("insert into acctitem values (200103,200,'汽油费',1)");  Log.v("cola","insert into ok");   }    public void QueryTable_acctitem(){   }   public void FirstStart(){  //如果是第一次启动,就不存在colaconfig这张表.  try{  String col[] = {"type", "name" };  Cursor c =db.query("sqlite_master", col, "name='colaconfig'", null, null, null, null);  int n=c.getCount();  if (c.getCount()==0){  CreateTable_acctitem();  CreateTable_colaconfig();  CreateTable_bills();  InitAcctitem();    }   Log.v("cola","c.getCount="+n+"");     }catch(Exception e){  Log.v("cola","e="+e.getMessage());  }   }   public void close(){  db.close();  } }