Android中SQLiteDatabase的使用-SQLite-数据库开发-六狼论坛-IT论坛-计算机论坛

vvsongsunny 发表于 2013-1-30 01:16:50

Android中SQLiteDatabase的使用

链接http://aina-hk55hk.iteye.com/blog/698794
package com.Aina.Android;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;

public class Test extends Activity {
/** Called when the activity is first created. */
private ListView lv = null;
private SQLiteDatabase mSQLiteDatabase = null;
private static final String DATABASE_NAME = "Test.db";
private static final String TABLE_NAME = "table_test";
private static final String COLUMN_ID = "_id";// INTEGER PRIMARY KEY
private static final String COLUMN_NAME = "name";// TEXT
private static final String COLUMN_AGE = "age";// INTEGER
private static final String CREATE_TABLE = "CREATE TABLE IF NOT EXISTS "
         + TABLE_NAME + " (" + COLUMN_ID + " INTEGER PRIMARY KEY,"
         + COLUMN_NAME + " TEXT," + COLUMN_AGE + " INTEGER)";

@Override
public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);
   setContentView(R.layout.main);
   lv = (ListView) this.findViewById(R.id.ListView01);
   try {
         mSQLiteDatabase = this.openOrCreateDatabase(DATABASE_NAME,
               Activity.MODE_PRIVATE, null);
   } catch (Exception ex) {
         this.ShowDialog("打开或者创建数据库异常:" + ex.getMessage());
   }
   try {
         mSQLiteDatabase.execSQL(CREATE_TABLE);
   } catch (Exception ex) {
         this.ShowDialog("创建表异常:" + ex.getMessage());
   }
   // this.InsertData();
   // this.InsertData2();
   // this.AddData();
   // this.UpdateData();
   // this.UpdateData2();
   // this.UpdateData3();
   // this.DeleteData();
   // this.DeleteData2();
   // this.DeleteData3();
   this.SelectData();
}

@Override
protected void onPause() {
   super.onPause();
   mSQLiteDatabase.close();// 关闭数据库
}

/**
* 插入数据-execSQL
*/
private void InsertData() {
   try {
         String str = "INSERT INTO " + TABLE_NAME + " (" + COLUMN_NAME + ","
               + COLUMN_AGE + ")VALUES('张三',30)";
         mSQLiteDatabase.execSQL(str);
   } catch (Exception ex) {
         this.ShowDialog("插入数据异常:" + ex.getMessage());
   }

}

/**
* 插入数据-execSQL
*/
private void InsertData2() {
   try {
         String str = "INSERT INTO " + TABLE_NAME + " (" + COLUMN_NAME + ","
               + COLUMN_AGE + ")VALUES(?,?)";
         Object[] ob = new Object[] { "王五", 50 };
         mSQLiteDatabase.execSQL(str, ob);
   } catch (Exception ex) {
         this.ShowDialog("插入数据异常:" + ex.getMessage());
   }
}

/**
* 插入数据-insert() nullColumnHack，这个参数需要传入一个列名。SQL标准并不允许插入所有列均为空的一行数据，
* 所以当传入的initialValues值为空或者为0时
* ，用nullColumnHack参数指定的列会被插入值为NULL的数据，然后再将此行插入到表中。
*/
private void AddData() {
   try {
         ContentValues cv = new ContentValues();
         cv.put(COLUMN_NAME, "李四");
         cv.put(COLUMN_AGE, 40);
         // long num = mSQLiteDatabase.insert(TABLE_NAME, COLUMN_NAME, cv);
         long num = mSQLiteDatabase.insertOrThrow(TABLE_NAME, null, cv);
         this.setTitle("num==" + num);
   } catch (Exception ex) {
         this.ShowDialog("插入数据异常:" + ex.getMessage());
   }

}

/**
* 更新数据
*/
private void UpdateData() {
   try {
         String str = "UPDATE " + TABLE_NAME + " SET " + COLUMN_AGE
               + " = 25 WHERE _id=1";
         mSQLiteDatabase.execSQL(str);
   } catch (Exception ex) {
         this.ShowDialog("更新数据异常:" + ex.getMessage());
   }
}

/**
* 更新数据
*/
private void UpdateData2() {
   try {
         String str = "UPDATE " + TABLE_NAME + " SET " + COLUMN_AGE
               + " = ? WHERE _id=?";
         Object[] Ob = new Object[] { 33, 2 };
         mSQLiteDatabase.execSQL(str, Ob);
   } catch (Exception ex) {
         this.ShowDialog("更新数据异常:" + ex.getMessage());
   }
}

/**
* 更新数据
*/
private void UpdateData3() {
   try {
         ContentValues cv = new ContentValues();
         cv.put(COLUMN_NAME, "李四4");
         cv.put(COLUMN_AGE, 43);
         int num = mSQLiteDatabase.update(TABLE_NAME, cv,
               COLUMN_NAME + "=?", new String[] { "李四" });
         this.setTitle("修改行数num=" + num);
   } catch (Exception ex) {
         this.ShowDialog("更新数据异常:" + ex.getMessage());
   }
}

/**
* 删除数据
*/
private void DeleteData() {
   try {
         String str = "DELETE FROM " + TABLE_NAME + " WHERE _id=3";
         mSQLiteDatabase.execSQL(str);
   } catch (Exception ex) {
         this.ShowDialog("删除数据异常:" + ex.getMessage());
   }
}

/**
* 删除数据
*/
private void DeleteData2() {
   try {
         String str = "DELETE FROM " + TABLE_NAME + " WHERE _id=?";
         mSQLiteDatabase.execSQL(str, new Object[] { 2 });
   } catch (Exception ex) {
         this.ShowDialog("删除数据异常:" + ex.getMessage());
   }
}

/**
* 删除数据
*/
private void DeleteData3() {
   try {
         int num = mSQLiteDatabase.delete(TABLE_NAME, "_id=1", null);
         this.setTitle("删除行数num=" + num);
   } catch (Exception ex) {
         this.ShowDialog("删除数据异常:" + ex.getMessage());
   }
}

/**
* 查询数据
*/
private void SelectData() {
   try {
         String sql = "SELECT * FROM " + TABLE_NAME;
         Cursor cursor = mSQLiteDatabase.rawQuery(sql,null);
         // Cursor cursor = mSQLiteDatabase.query(TABLE_NAME, new String[] {
         // COLUMN_ID, COLUMN_NAME, COLUMN_AGE }, COLUMN_NAME + "=?",
         // new String[] { "李四" }, null, null, null);
         if (cursor != null) {
            ListAdapter adapter = new SimpleCursorAdapter(this,
                     R.layout.ss, cursor, new String[] { COLUMN_ID,
                           COLUMN_NAME, COLUMN_AGE },
                     new int[] { R.id.TextView1, R.id.TextView2,
                           R.id.TextView3 });
            lv.setAdapter(adapter);
         }
   } catch (Exception ex) {
         this.ShowDialog("查询数据异常:" + ex.getMessage());
   }
}
/**
* 删除表
*/
private void DropTable(){
   try{
         String sql = "DROP TABLE "+TABLE_NAME;
         mSQLiteDatabase.execSQL(sql);
   }catch(Exception ex){
         this.ShowDialog("删除表异常:"+ex.getMessage());
   }
}
/**
* 删除数据库
*/
private void DropDatabase(){
   try{
         this.deleteDatabase(DATABASE_NAME);
   }catch(Exception ex){
         this.ShowDialog("删除数据库异常:"+ex.getMessage());
   }
}
/**
* 提示对话框
* @param msg
*/
private void ShowDialog(String msg) {
   new AlertDialog.Builder(this).setTitle("提示").setMessage(msg)
            .setPositiveButton("OK", new DialogInterface.OnClickListener() {

               @Override
               public void onClick(DialogInterface dialog, int which) {

               }

            }).show();
}
}
2.main.xml
Java代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_width="fill_parent"
   android:layout_height="wrap_content" android:text="@string/hello" />
<ListView android:id="@+id/ListView01" android:layout_width="fill_parent"
   android:layout_height="wrap_content"></ListView>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_width="fill_parent"
android:layout_height="wrap_content" android:text="@string/hello" />
<ListView android:id="@+id/ListView01" android:layout_width="fill_parent"
android:layout_height="wrap_content"></ListView>
</LinearLayout>

3.ss.xml
Java代码
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="fill_parent"
android:paddingTop="5dip" android:paddingBottom="5dip" android:paddingLeft="5dip"
android:layout_height="wrap_content">
<TextView android:id="@+id/TextView1" android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="" />
<TextView android:id="@+id/TextView2" android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:textSize="20px" android:layout_marginLeft="50dip" android:paddingRight="50dip"
   android:text="" />
<TextView android:id="@+id/TextView3" android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="" />

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Android中SQLiteDatabase的使用