DatabaseHelper.java
package com.exampl.mysql;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;
import android.widget.Toast;
public class DatabaseHelper extends SQLiteOpenHelper{
private Context mContext;
public static final String CREATE_TABLE_SQL="create table dict(_id integer primary key autoincrement,word text,detail text);";
public DatabaseHelper(Context context,String name,CursorFactory factory,int version)
{
super(context,name,factory,version);
mContext=context;
}
public void onCreate(SQLiteDatabase db)
{
db.execSQL(CREATE_TABLE_SQL);
Toast.makeText(mContext,"创建成功!",Toast.LENGTH_LONG).show();
}
public void onUpgrade(SQLiteDatabase db,int oldVersion,int newVersion)
{
}
}
MainActivity.java
package com.exampl.mysql;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener{
private Button insert=null;
private Button search=null;
private EditText word=null;
private EditText detail=null;
private EditText key=null;
DatabaseHelper dbHelper;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
dbHelper=new DatabaseHelper(this,"myDict.db3",null,1);
insert=(Button)findViewById(R.id.insert);
insert.setOnClickListener(this);
search=(Button)findViewById(R.id.search);
search.setOnClickListener(this);
word=(EditText)findViewById(R.id.word);
detail=(EditText)findViewById(R.id.detail);
key=(EditText)findViewById(R.id.key);
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.insert:
String wor=word.getText().toString().trim();
String det=detail.getText().toString().trim();
insertData(dbHelper.getReadableDatabase(),wor,det);
Toast.makeText(this, "添加生词成功!", Toast.LENGTH_LONG).show();
break;
case R.id.search:
String ke=key.getText().toString().trim();
Cursor cursor=dbHelper.getReadableDatabase().rawQuery("select*from dict where word like? or details like?", new String[]{"%"+ke+"%","%"+ke+"%"});
Bundle data=new Bundle();
data.putSerializable("date", converCursorToList(cursor));
Intent intent=new Intent(MainActivity.this,Result.class);
intent.putExtras(data);
startActivity(intent);
break;
default:break;
}
}
protected ArrayList<Map<String,String>> converCursorToList(Cursor cursor)
{
ArrayList<Map<String,String>> result=new ArrayList<Map<String,String>>();
while (cursor.moveToNext())
{
Map<String,String> map=new HashMap<String,String>();
map.put("word", cursor.getString(1));
map.put("detail", cursor.getString(2));
result.add(map);
}
return result;
}
private void insertData(SQLiteDatabase db,String word,String detail)
{
db.execSQL("insert into dict values(null,?,?)"+new String[]{word,detail});
}
@Override
public void onDestroy()
{
super.onDestroy();
if (dbHelper!=null)
dbHelper.close();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Result.java
package com.exampl.mysql;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Result extends Activity {
private TextView jieguo=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.line);
jieguo=(TextView)findViewById(R.id.jieguo);
Bundle bundle=getIntent().getExtras();
jieguo.setText(bundle.getString("date"));
}
}
改成这样应该可以了
db.execSQL("insert into dict (word, detail) values(?,?)", new String[]{word,detail});
字符串这么拼是不对的,new String[]{word,detail}是一个对象,拼出来的不是sql语句
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.exampl.mysql.MainActivity"
android:orientation="vertical" >
<EditText
android:inputType="text"
android:id="@+id/word"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<EditText
android:inputType="text"
android:id="@+id/detail"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:lines="3" />
<Button
android:id="@+id/insert"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/insert" />
<EditText
android:inputType="text"
android:id="@+id/key"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="@+id/search"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/search" />
<ListView
android:id="@+id/show"
android:layout_width="match_parent"
android:layout_height="match_parent">
</ListView>
</LinearLayout>
line.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="@+id/jieguo"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.exampl.mysql"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Result"
android:label="@string/app_name" >
</activity>
</application>
</manifest>
这是SQL插入报异常。SQL语句报错一般不会明确问题出在哪里。需要仔细排查一下。看Log日志,应该是insert into dict 这里出问题了,检查一下:1.数据类型是否正确;2.是否插入了null;2.数据库中字段是否是SQL内定的字段(比如index,被数据库占用了,如果你在使用,会报各种奇葩的错,需要转义)。
db.execSQL("insert into dict values(null,?,?)"+new String[]{word,detail}); 这句话错了,你的主键已经自动增长,主键不用自己添加,你添加会报错的,
你把null去掉就可以了
db.execSQL("insert into dict values(null,?,?)"+new String[]{word,detail}); 你拿三个值给两个列赋值 能不崩溃么?