我是Android开发的新手，我正在尝试使用SQLite创建数据库，我一直试图解决这个问题几个小时，但我不知道问题出在哪里。
这是Logcat中出现的内容。
04-22 20:40:11.801 3134-3134/? D/AndroidRuntime: >>>>>> START com.android.internal.os.RuntimeInit uid 0 <<<<<<
04-22 20:40:11.802 3134-3134/? D/AndroidRuntime: CheckJNI is ON
04-22 20:40:11.813 3134-3134/? D/ICU: No timezone override file found: /data/misc/zoneinfo/current/icu/icu_tzdata.dat
04-22 20:40:11.825 3134-3134/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-22 20:40:11.825 3134-3134/? E/android.os.Debug: failed to load memtrack module: -2
04-22 20:40:11.826 3134-3134/? I/Radio-JNI: register_android_hardware_Radio DONE
04-22 20:40:11.834 3134-3134/? D/AndroidRuntime: Calling main entry com.android.commands.am.Am
04-22 20:40:11.836 1300-1816/? I/ActivityManager: Force stopping com.example.carlos.assigment appid=10057 user=0: from pid 3134
04-22 20:40:11.836 1300-1816/? I/ActivityManager: Killing 3109:com.example.carlos.assigment/u0a57 (adj 9): stop com.example.carlos.assigment
04-22 20:40:11.854 1300-1481/? W/ActivityManager: Spurious death for ProcessRecord{f73785a 0:com.example.carlos.assigment/u0a57}, curProc for 3109: null
04-22 20:40:11.858 3134-3134/? D/AndroidRuntime: Shutting down VM
04-22 20:40:11.863 1300-2975/? E/Surface: getSlotFromBufferLocked: unknown buffer: 0xa1373490
04-22 20:40:11.869 1300-1498/? W/InputMethodManagerService: Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@3e0c026 attribute=null, token = android.os.BinderProxy@f5dce74
04-22 20:40:12.043 1300-1319/? W/AppOps: Finishing op nesting under-run: uid 1000 pkg android code 24 time=0 duration=0 nesting=0
04-22 20:40:12.363 3147-3147/? D/AndroidRuntime: >>>>>> START com.android.internal.os.RuntimeInit uid 0 <<<<<<
04-22 20:40:12.364 3147-3147/? D/AndroidRuntime: CheckJNI is ON
04-22 20:40:12.372 3143-3143/? D/AndroidRuntime: >>>>>> START com.android.internal.os.RuntimeInit uid 0 <<<<<<
04-22 20:40:12.373 3143-3143/? D/AndroidRuntime: CheckJNI is ON
04-22 20:40:12.383 3143-3143/? D/ICU: No timezone override file found: /data/misc/zoneinfo/current/icu/icu_tzdata.dat
04-22 20:40:12.394 3147-3147/? D/ICU: No timezone override file found: /data/misc/zoneinfo/current/icu/icu_tzdata.dat
04-22 20:40:12.405 3143-3143/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-22 20:40:12.405 3143-3143/? E/android.os.Debug: failed to load memtrack module: -2
04-22 20:40:12.406 3143-3143/? I/Radio-JNI: register_android_hardware_Radio DONE
04-22 20:40:12.418 3147-3147/? E/memtrack: Couldn't load memtrack module (No such file or directory)
04-22 20:40:12.418 3147-3147/? E/android.os.Debug: failed to load memtrack module: -2
04-22 20:40:12.419 3147-3147/? I/Radio-JNI: register_android_hardware_Radio DONE
04-22 20:40:12.423 3143-3143/? D/AndroidRuntime: Calling main entry com.android.commands.wm.Wm
04-22 20:40:12.424 3143-3143/? D/AndroidRuntime: Shutting down VM
04-22 20:40:12.435 3147-3147/? D/AndroidRuntime: Calling main entry com.android.commands.am.Am
04-22 20:40:12.438 1300-1497/? I/ActivityManager: START u0 {act=android.intent.action.MAIN cat=[android.intent.category.LAUNCHER] flg=0x10000000 cmp=com.example.carlos.assigment/.MainActivity} from uid 0 on display 0
04-22 20:40:12.439 3143-3159/? E/art: Thread attaching while runtime is shutting down: Binder_2
04-22 20:40:12.439 3143-3159/? I/AndroidRuntime: NOTE: attach of thread 'Binder_2' failed
04-22 20:40:12.449 3147-3147/? D/AndroidRuntime: Shutting down VM
04-22 20:40:12.461 3162-3162/? I/art: Not late-enabling -Xcheck:jni (already on)
04-22 20:40:12.470 1300-1495/? I/ActivityManager: Start proc 3162:com.example.carlos.assigment/u0a57 for activity com.example.carlos.assigment/.MainActivity
04-22 20:40:12.508 3162-3162/? W/System: ClassLoader referenced unknown path: /data/app/com.example.carlos.assigment-1/lib/x86
04-22 20:40:12.545 2305-2337/? E/Surface: getSlotFromBufferLocked: unknown buffer: 0xb4092ee0
04-22 20:40:12.585 3162-3162/? E/SQLiteLog: (1) near "TABLEtable": syntax error
04-22 20:40:12.586 3162-3162/? D/AndroidRuntime: Shutting down VM
04-22 20:40:12.586 3162-3162/? E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.carlos.assigment, PID: 3162
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.carlos.assigment/com.example.carlos.assigment.MainActivity}: android.database.sqlite.SQLiteException: near "TABLEtable": syntax error (code 1): , while compiling: CREATE TABLEtable(Conductivity FLOATOxygen INTEGERpHFLOAT usernameSTRING PRIMARY KEY passwordTEXTmoisture INTEGER );
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
Caused by: android.database.sqlite.SQLiteException: near "TABLEtable": syntax error (code 1): , while compiling: CREATE TABLEtable(Conductivity FLOATOxygen INTEGERpHFLOAT usernameSTRING PRIMARY KEY passwordTEXTmoisture INTEGER );
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:887)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:498)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:31)
at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1674)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1605)
at com.example.carlos.assigment.DBAdapter.onCreate(DBAdapter.java:43)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at com.example.carlos.assigment.DBAdapter.databaseToString(DBAdapter.java:75)
at com.example.carlos.assigment.MainActivity.printDatabase(MainActivity.java:62)
at com.example.carlos.assigment.MainActivity.onCreate(MainActivity.java:40)
at android.app.Activity.performCreate(Activity.java:6237)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1107)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2369)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
at android.app.ActivityThread.-wrap11(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5417)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
04-22 20:40:12.587 1300-1481/? W/ActivityManager: Force finishing activity com.example.carlos.assigment/.MainActivity
04-22 20:40:12.601 952-952/? E/EGL_emulation: tid 952: eglCreateSyncKHR(1294): error 0x3004 (EGL_BAD_ATTRIBUTE)
04-22 20:40:12.685 1300-2975/? I/OpenGLRenderer: Initialized EGL, version 1.4
04-22 20:40:12.707 1300-2975/? W/EGL_emulation: eglSurfaceAttrib not implemented
04-22 20:40:12.707 1300-2975/? W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0x9c3e5960, error=EGL_SUCCESS
04-22 20:40:13.121 1300-1314/? W/ActivityManager: Activity pause timeout for ActivityRecord{4a19467 u0 com.example.carlos.assigment/.MainActivity t6 f}
04-22 20:40:13.162 2305-2337/? W/EGL_emulation: eglSurfaceAttrib not implemented
04-22 20:40:13.162 2305-2337/? W/OpenGLRenderer: Failed to set EGL_SWAP_BEHAVIOR on surface 0xa0975000, error=EGL_SUCCESS
这是我的MainActivity
package com.example.carlos.assigment;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
EditText exampleInput;
TextView exampletext;
DBAdapter dbHandler;
EditText exampleInput1;
EditText exampleInput2;
EditText exampleInput3;
EditText exampleInput4;
EditText exampleInput5;;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
exampleInput =(EditText)findViewById(R.id.exampleInput);
exampleInput1 =(EditText)findViewById(R.id.exampleInput1);
exampleInput2 =(EditText)findViewById(R.id.exampleInput2);
exampleInput3 =(EditText)findViewById(R.id.exampleInput3);
exampleInput4 =(EditText)findViewById(R.id.exampleInput4);
exampleInput5 =(EditText)findViewById(R.id.exampleInput5);
exampletext = (TextView) findViewById(R.id.exampletext);
dbHandler = new DBAdapter(this, null, null, 1);
printDatabase();}
public void addButtonClicked(View view){
DatabaseList data = new DatabaseList(exampleInput.getText().toString(),
exampleInput2.getText().toString(),
exampleInput1.getText().toString(),
Integer.parseInt(exampleInput3.getText().toString()),
Float.valueOf(exampleInput4.getText().toString()),
Float.valueOf(exampleInput5.getText().toString()));
dbHandler.addData(data);
printDatabase();
dbHandler.deleteData();
}
public void deleteButtonClicked(){
}
public void printDatabase(){
String dbString = dbHandler.databaseToString();
exampletext.setText(dbString);
exampleInput.setText("");
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
这是我执行SQL操作的地方
package com.example.carlos.assigment;
import android.content.*;
import android.database.*;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
public class DBAdapter extends SQLiteOpenHelper {
private static final int DATA_VERSION = 1;
private static final String DATABASE_NAME = "database.db";
public static final String TABLE = "table";
public static final String COLUMN_CONDUCTIVITY ="Conductivity";
public static final String COLUMN_OXYGEN = "Oxygen";
public static final String COLUMN_PH = "pH";
public static final String COLUMN_USERNAME = "username";
public static final String COLUMN_PASSWORD = "password";
public static final String COLUMN_MOISTURE = "moisture";
public DBAdapter(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
super(context, DATABASE_NAME, factory, DATA_VERSION);
}
public DBAdapter(Context context, String name, SQLiteDatabase.CursorFactory factory, int version, DatabaseErrorHandler errorHandler) {
super(context, name, factory, version, errorHandler);
}
@Override
public void onCreate(SQLiteDatabase db) {
String query = "CREATE TABLE" + TABLE + "(" +
COLUMN_CONDUCTIVITY+ " FLOAT" +
COLUMN_OXYGEN+ " INTEGER" +
COLUMN_PH+ "FLOAT " +
COLUMN_USERNAME+ "STRING PRIMARY KEY " +
COLUMN_PASSWORD + "TEXT" +
COLUMN_MOISTURE+ " INTEGER "+
");";
db.execSQL(query);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP_TABLE_IF_EXITS" + TABLE);
onCreate(db);
}
//Add a new row to the database
public void addData(DatabaseList data){
ContentValues values = new ContentValues();
values.put(COLUMN_CONDUCTIVITY, data.getConductivity());
values.put(COLUMN_OXYGEN, data.getDate());
values.put(COLUMN_OXYGEN, data.getOxygen());
values.put(COLUMN_PASSWORD, data.getPassword());
values.put(COLUMN_USERNAME, data.getUsername());
values.put(COLUMN_PH, data.getpH());
SQLiteDatabase db = getWritableDatabase();
db.insert(TABLE, null, values);
db.close();
}
//Delete data
public void deleteData(){
SQLiteDatabase db = getWritableDatabase();
db.execSQL("DROP TABLE IF EXIST, TABLE");
}
public String databaseToString(){
String dbString = "";
SQLiteDatabase db = getWritableDatabase();
String query = "SELECT * FROM" + TABLE + "WHERE 1";
Cursor c = db.rawQuery(query,null);
c.moveToFirst();
while(!c.isAfterLast()){
if(c.getString(c.getColumnIndex("Conductivity"))!= null){
dbString += c.getString(c.getColumnIndex(("Conductivity")));
dbString += "\n";
}
}
db.close();
return dbString;
}
}
这是我的数据库列表
package com.example.carlos.assigment;
/**
* Created by Carlos on 22/04/2016.
*/
public class DatabaseList {
private String username;
private String password;
private float conductivity;
private float pH;
private int oxygen;
private String date;
public DatabaseList(){}
public DatabaseList(String username, String password, String date, int oxygen, float pH, float conductivity){
this.conductivity = conductivity;
this.date = date;
this.oxygen = oxygen;
this.password = password;
this.pH = pH;
this.username = username;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public float getConductivity() {
return conductivity;
}
public void setConductivity(float conductivity) {
this.conductivity = conductivity;
}
public float getpH() {
return pH;
}
public void setpH(float pH) {
this.pH = pH;
}
public int getOxygen() {
return oxygen;
}
public void setOxygen(int oxygen) {
this.oxygen = oxygen;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
}
这是我的主要内容布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="com.example.carlos.assigment1.MainActivity"
tools:showIn="@layout/activity_main">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hello World!"
android:id="@+id/textView" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="New Button"
android:id="@+id/addButton"
android:layout_marginTop="48dp"
android:layout_below="@+id/textView"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginLeft="45dp"
android:layout_marginStart="45dp" />
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="delete"
android:id="@+id/deleteButton"
android:layout_alignTop="@+id/addButton"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:layout_marginRight="61dp"
android:layout_marginEnd="61dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/exampleInput1"
android:layout_above="@+id/exampleInput2"
android:layout_toRightOf="@+id/exampleInput"
android:layout_toEndOf="@+id/exampleInput" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/exampleInput2"
android:layout_centerVertical="true"
android:layout_toRightOf="@+id/addButton"
android:layout_toEndOf="@+id/addButton" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/exampleInput3"
android:layout_marginTop="13dp"
android:layout_below="@+id/exampleInput2"
android:layout_toRightOf="@+id/exampleInput5"
android:layout_toEndOf="@+id/exampleInput5" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/exampleInput4"
android:layout_below="@+id/exampleInput3"
android:layout_toRightOf="@+id/addButton"
android:layout_toEndOf="@+id/addButton"
android:layout_marginTop="25dp" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/exampleInput5"
android:layout_marginTop="16dp"
android:layout_below="@+id/exampleInput4"
android:layout_toLeftOf="@+id/exampleInput4"
android:layout_toStartOf="@+id/exampleInput4" />
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/exampleInput"
android:layout_above="@+id/exampletext"
android:layout_alignRight="@+id/addButton"
android:layout_alignEnd="@+id/addButton" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Large Text"
android:id="@+id/exampletext"
android:layout_alignTop="@+id/exampleInput1"
android:layout_toRightOf="@+id/deleteButton"
android:layout_toEndOf="@+id/deleteButton" />
</RelativeLayout>
我真的陷入了困境并且没有想法。
答案 0 :(得分：1)
将您的查询修复为SQLiteOpenHelper.onCreate。缺少一些空间：
Caused by: android.database.sqlite.SQLiteException: near "TABLEtable":
syntax error (code 1): , while compiling:
CREATE TABLEtable(Conductivity FLOATOxygen INTEGERpHFLOAT usernameSTRING PRIMARY KEY passwordTEXTmoisture INTEGER );
答案 1 :(得分：0)
对于初学者，您需要处理您的创建声明......
"dashed"最好记录原始查询，以便将它们作为SQL查询读取，然后更容易在查询形式中发现错误。
答案 2 :(得分：0)
编辑像这样的