android Sqlite 数据库创建

最新推荐文章于 2022-08-20 22:13:22 发布

ManLikeTheWind

最新推荐文章于 2022-08-20 22:13:22 发布

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分类专栏： sqlite 数据库

本文链接：https://blog.youkuaiyun.com/a2241076850/article/details/69525898

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本文详细介绍了一个用于Android平台的SQLite数据库创建过程。通过继承SQLiteOpenHelper类并实现onCreate和onUpgrade方法，文章展示了如何定义和创建单聊、群聊及个人信息等数据库表结构，并提供了具体的SQL语句。

例子一：

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

public class SQLiteDbHelper extends SQLiteOpenHelper{

	public SQLiteDbHelper(Context context, String name, CursorFactory factory,int version) {
		super(context, name, factory, version);
		// TODO Auto-generated constructor stub
	}
	public SQLiteDbHelper(Context context, String name,int version) {
		this(context, name, null, version);
		// TODO Auto-generated constructor stub
	}
	public SQLiteDbHelper(Context context) {
		this(context, DBConstants.DATABASE_NAME, DBConstants.DATABASE_VERSION);
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		createSingleChat(db);
		createGroupChat(db);
		createMe(db);
		
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
			
		
	}	
	
	/** 创建单聊数据库*/
	private void createSingleChat(SQLiteDatabase db) {
		String sql="create table if not exists "+DBConstants.DB_CHAT_SINGLE+"("
				+ DBConstants.DB_CHAT_SINGLE_id +" integer primary key autoincrement,"
				+ DBConstants.DB_CHAT_SINGLE_ID_MECOUNT+" text default ' ',"//设置默认值是空格
				+ DBConstants.DB_CHAT_SINGLE_ID_PEARCOUNT+" text,"
				+ DBConstants.DB_CHAT_SINGLE_ID_MSG+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_ID_MSG_CONVERSATION+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_ID_IMDNMSG+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_ID_FILETRANS+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_MSG_TIME+" integer default 0 ,"//  时间按照integer 进行存储，数据传递过来的数据格式是：yyyy-MM-dd HH:mm:ss
				+ DBConstants.DB_CHAT_SINGLE_TIMEZONEID+" text default ' ',"
				
				+ DBConstants.DB_CHAT_SINGLE_MSG_DIRECTION+" integer default 0,"
				+ DBConstants.DB_CHAT_SINGLE_MSG_STATE+" integer default 0,"
				+ DBConstants.DB_CHAT_SINGLE_MSG_TYPE+" integer default 0,"
				
				+ DBConstants.DB_CHAT_SINGLE_PARAM1+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_PARAM2+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_PARAM3+" text default ' ',"
				
				+ DBConstants.DB_CHAT_SINGLE_FILE_SIZE+" integer default 0,"
				+ DBConstants.DB_CHAT_SINGLE_FILE_TRANS_SIZE+" integer default 0,"
				
				+ DBConstants.DB_CHAT_SINGLE_FILE_THUMB_PATH+" text default ' ',"
				
				+ DBConstants.DB_CHAT_SINGLE_RECEIPT_TYPE+" integer default 0,"
				+ DBConstants.DB_CHAT_SINGLE_PROGRESS+"  integer default 0,"
				
				+ DBConstants.DB_CHAT_SINGLE_NAME+" text default ' ',"
				+ DBConstants.DB_CHAT_SINGLE_HEAD_ICON_PATH+" text default ' ',"
				
				+ DBConstants.DB_CHAT_SINGLE_MSG_SOURCE+"  integer default 0,"
				
				+ DBConstants.DB_CHAT_SINGLE_RSP_TIME+" text default ' ')";
		MyLog.d("Mine 数据库", sql);
		db.execSQL(sql);
		
	}
	
	/** 创建群聊数据库*/
	private void createGroupChat(SQLiteDatabase db) {
		
		
	}

	/** 创建我的数据库*/
	private void createMe(SQLiteDatabase db) {
		
		
	}
	
	
	

}

注释：

创建方法：

	private void createTable(SQLiteDatabase db) {
		StringBuffer buffer = new StringBuffer();
		buffer.append("CREATE TABLE '" + Constants.TABLE_CONTACTS + "' ( ");
		buffer.append("'" + Constants.CONTACTSID + "' INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT, ");// id
		buffer.append(" '" + Constants.MAILCONTACTSNAME + "' varchar(30) ,");
		buffer.append("'" + Constants.MAILBOX + "' varchar(30) , ");
		buffer.append("'" + Constants.CONTACTS_id + "' varchar(30) , ");
		buffer.append("'" + Constants.SORT + "' varchar(30),  ");
		buffer.append("'" + Constants.REMARKS + "'  varchar(30))");
		db.execSQL(buffer.toString());
	}
	/**
	 * 创建 "我" 的设置 列表
	 * @param db
	 */
	private void createMineTable(SQLiteDatabase db){
		String sql="create table if not exists "+Constants.TABLE_MINE+"("
				+ Constants.CONTACTSID +" integer primary key autoincrement,"
				+ Constants.TABLE_MINE_COUNT+" text default ' ',"//设置默认值是空格
				+ Constants.TABLE_MINE_HEAD+" text,"
				+ Constants.TABLE_MINE_NICK+" text default ' ',"
				+ Constants.TABLE_MINE_PHONE+" text default ' ',"
				+ Constants.TABLE_MINE_COMPANY+" text default ' ',"
				+ Constants.TABLE_MINE_CAPACITY+" text default ' ',"
				+ Constants.TABLE_MINE_ISPUSH+" integer default 0,"//默认不开启推送
				+ Constants.TABLE_MINE_SIGN+" text  default ' ')";
		MyLog.d("Mine 数据库", sql);
		db.execSQL(sql);
	}