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#5 #10 第五次实验 #362

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May 22, 2017
Merged

#5 #10 第五次实验 #362

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84 changes: 84 additions & 0 deletions ...ain/java/edu/hzuapps/androidlabs/homeworks/net1414080903226/Net1414080903226DBHelper.java
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package edu.hzuapps.androidlabs.homeworks.net1414080903226;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class Net1414080903226DBHelper extends SQLiteOpenHelper {
public static final int DATABASE_VERSION = 13;
public static final String DATABASE_NAME = "database.db";
public static final String TABLE_BLOCK = "block";
public static final String TABLE_SAVE = "save";
public static final String TABLE_SEED = "seed";
public static final String TABLE_STEVE = "steve";

public static final String SAVE_PREFIX = "world_";

private static final String SQL_CREATE_BLOCK =
"CREATE TABLE " + TABLE_BLOCK + " (" +
"chunkX INTEGER," +
"chunkY INTEGER," +
"chunkZ INTEGER," +
"blockX INTEGER," +
"blockY INTEGER," +
"blockZ INTEGER," +
"blockType INTEGER," +
"PRIMARY KEY(blockX, blockY, blockZ));";

private static final String SQL_CREATE_SEED =
"CREATE TABLE " + TABLE_SEED + " (" +
"seed INTEGER PRIMARY KEY);";

private static final String SQL_CREATE_SAVE =
"CREATE TABLE " + TABLE_SAVE + " (" +
"id INTEGER PRIMARY KEY AUTOINCREMENT," +
"name TEXT," +
"seed INTEGER," +
"date TEXT," +
"x INTEGER," +
"y INTEGER," +
"z INTEGER);";

private static final String SQL_CREATE_STEVE =
"CREATE TABLE " + TABLE_STEVE + " (" +
"x INTEGER," +
"y INTEGER," +
"z INTEGER," +
"PRIMARY KEY(x, y, z));";

public static final String SQL_DROP_TABLE =
"DROP TABLE IF EXISTS ";

private static Net1414080903226DBHelper instance = null;

private static Context context = null;

public static void setContext(Context c){
context = c;
}

public synchronized static Net1414080903226DBHelper getInstance(){
if (instance == null) {
instance = new Net1414080903226DBHelper(context);
}
return instance;
}

private Net1414080903226DBHelper(Context context){
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}

public void onCreate(SQLiteDatabase db){
db.execSQL(SQL_CREATE_BLOCK);
db.execSQL(SQL_CREATE_SEED);
db.execSQL(SQL_CREATE_SAVE);
db.execSQL(SQL_CREATE_STEVE);
}

public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){
db.execSQL(SQL_DROP_TABLE + TABLE_BLOCK);
db.execSQL(SQL_DROP_TABLE + TABLE_SEED);
db.execSQL(SQL_DROP_TABLE + TABLE_SAVE);
db.execSQL(SQL_DROP_TABLE + TABLE_STEVE);
onCreate(db);
}