我有一个使用 SQLite 数据库的 Android 应用程序。但是当它到达 select 语句时它会强制关闭。我有一个用于执行此操作的类文件:
package com.thesis.menubook;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import java.util.ArrayList;
import java.util.List;
public class DBConnect {
int id = 0;
public static final String KEY_ROWID = "_id";
public static final String KEY_IP = "saved_ip_address";
private static final String TAG = "DBConnect";
private static final String DATABASE_NAME = "MenuBook";
private static final String DATABASE_TABLE_1 = "ipaddress";
//private static final String DATABASE_TABLE_2 = "menudb";
//private static final String DATABASE_TABLE_3 = "recipelist";
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_CREATE_TABLE_1 =
"CREATE TABLE ipaddress (_id integer primary key autoincrement, " +
"saved_ip_address text not null " +
"); ";
private static final String DATABASE_CREATE_TABLE_2 =
"CREATE TABLE menudb (menu_ID varchar primary key not null, " +
"menu_name longtext, " +
"menu_price double null default, " +
"menu_description longtext, " +
"menu_category text, " +
"menu_status text " +
"); ";
private static final String DATABASE_CREATE_TABLE_3 =
"CREATE TABLE recipelist (recipe_ID integer primary key not null autoincrement, " +
"menu_ID varchar null default, " +
"stock_ID varchar null default, " +
"recipe_quantity double null defualt " +
");" ;
private final Context context;
private static DatabaseHelper DBHelper;
private static SQLiteDatabase db;
public DBConnect(Context ctx)
{
this.context = ctx;
DBHelper = new DatabaseHelper(context);
}
public static class DatabaseHelper extends SQLiteOpenHelper
{
DatabaseHelper(Context context)
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db)
{
db.execSQL(DATABASE_CREATE_TABLE_1);
db.execSQL(DATABASE_CREATE_TABLE_2);
db.execSQL(DATABASE_CREATE_TABLE_3);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion,
int newVersion)
{
Log.w(TAG, "Upgrading database from version " + oldVersion
+ " to "
+ newVersion + ", which will destroy all old data");
db.execSQL("DROP TABLE IF EXISTS ipaddress");
db.execSQL("DROP TABLE IF EXISTS menudb");
db.execSQL("DROP TABLE IF EXISTS recipelist");
onCreate(db);
}
}
//---opens the database---
public DBConnect open() throws SQLException
{
db = DBHelper.getWritableDatabase();
return this;
}
//---closes the database---
public void close()
{
DBHelper.close();
}
//---insert a title into the database---
public long insertIPAddress(String ipaddress)
{
ContentValues initialValues = new ContentValues();
initialValues.put(KEY_IP, ipaddress);
return db.insert(DATABASE_TABLE_1, null, initialValues);
}
public String getIP()
{
String retrievedIP;
String query = "SELECT saved_ip_address FROM ipaddress WHERE _id = (SELECT MAX(_id) FROM ipaddress)";
Cursor cursor = db.rawQuery(query, null);
retrievedIP= cursor.getString(cursor.getColumnIndex("saved_ip_address"));
cursor.close();
return retrievedIP;
}
public List<ColumnValue[]> select(final String query)
{
List<ColumnValue[]> result = null;
Cursor cursor = db.rawQuery(query, null);
if (cursor.moveToFirst())
{
result = new ArrayList<ColumnValue[]>();
do
{
int columns = cursor.getColumnCount();
ColumnValue[] cvarray = new ColumnValue[columns];
for (int i=0; i<columns; i++)
{
String key = cursor.getColumnName(i);
String value = cursor.getString(i);
ColumnValue cv = new ColumnValue(key, value);
cvarray[i] = cv;
}
result.add(cvarray);
}
while (cursor.moveToNext());
}
cursor.close();
return result;
}
public class ColumnValue
{
public String column, value;
public ColumnValue(String c, String v)
{
column = c; value = v;
}
}
}
现在，当我查看 LogCat 时，我注意到“红色”错误(我真的不知道颜色的含义)从应用程序开始使用 onCreate 中的数据库的位置开始。
我在 sql 中看不到任何错误。这是因为 Eclipse、我的系统还是我的 create 语句确实存在错误？一定要指出来!
这是我的 LogCat，其中错误的开头以粗体显示。
谢谢
01-25 22:58:30.245: DEBUG/AndroidRuntime(521): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
01-25 22:58:30.248: DEBUG/AndroidRuntime(521): CheckJNI is ON
01-25 22:58:34.103: DEBUG/AndroidRuntime(521): Calling main entry com.android.commands.pm.Pm
01-25 23:03:39.518: INFO/ActivityManager(83): Starting: Intent { cmp=com.thesis.menubook/.ChooseTable } from pid 541
01-25 23:03:40.161: WARN/ActivityManager(83): Activity pause timeout for ActivityRecord{4078a9e0 com.thesis.menubook/.IPAddress}
01-25 23:03:40.769: INFO/SqliteDatabaseCpp(541): sqlite 返回: 错误代码 = 1，msg = 接近“自动增量”:语法错误，db=/data/data/com.thesis .menubook/databases/MenuBook
01-25 23:03:40.849: WARN/System.err(541): android.database.sqlite.SQLiteException: near "autoincrement": syntax error
01-25 23:03:40.889: WARN/System.err(541): at android.database.sqlite.SQLiteStatement.native_executeSql(Native Method)
01-25 23:03:40.889: WARN/System.err(541): at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:89)
01-25 23:03:40.889: WARN/System.err(541): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1933)
01-25 23:03:40.939: WARN/System.err(541): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1864)
01-25 23:03:40.939: WARN/System.err(541): at com.thesis.menubook.DBConnect$DatabaseHelper.onCreate(DBConnect.java:68)
01-25 23:03:40.958: WARN/System.err(541): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
01-25 23:03:40.958: WARN/System.err(541): at com.thesis.menubook.DBConnect.open(DBConnect.java:89)
01-25 23:03:40.958: WARN/System.err(541): at com.thesis.menubook.IPAddress$InsertIPAddress$1.run(IPAddress.java:92)
01-25 23:03:40.978: WARN/System.err(541): at android.os.Handler.handleCallback(Handler.java:587)
01-25 23:03:40.978: WARN/System.err(541): at android.os.Handler.dispatchMessage(Handler.java:92)
01-25 23:03:40.978: WARN/System.err(541): at android.os.Looper.loop(Looper.java:132)
01-25 23:03:40.978: WARN/System.err(541): at android.app.ActivityThread.main(ActivityThread.java:4025)
01-25 23:03:41.046: WARN/System.err(541): at java.lang.reflect.Method.invokeNative(Native Method)
01-25 23:03:41.049: WARN/System.err(541): at java.lang.reflect.Method.invoke(Method.java:491)
01-25 23:03:41.068: WARN/System.err(541): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
01-25 23:03:41.078: WARN/System.err(541): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
01-25 23:03:41.124: WARN/System.err(541): at dalvik.system.NativeStart.main(Native Method)
01-25 23:03:49.440: INFO/ActivityManager(83): Displayed com.thesis.menubook/.ChooseTable: +9s277ms
01-25 23:03:49.678: WARN/ActivityManager(83): Launch timeout has expired, giving up wake lock!
01-25 23:03:50.244: WARN/ActivityManager(83): Activity idle timeout for ActivityRecord{408897c0 com.thesis.menubook/.ChooseTable}
01-25 23:03:51.832: WARN/InputConnectionWrapper.ICC(136): Timed out waiting on IInputContextCallback
01-25 23:03:53.015: INFO/InputConnectionWrapper.ICC(136): Got out-of-sequence callback 189 (expected 190) in setCursorCapsMode, ignoring.
01-25 23:04:47.188: INFO/SqliteDatabaseCpp(541): sqlite returned: error code = 1, msg = near "autoincrement": syntax error, db=/data/data/com.thesis.menubook/databases/MenuBook
01-25 23:04:47.258: WARN/System.err(541): android.database.sqlite.SQLiteException: near "autoincrement": syntax error
01-25 23:04:47.327: WARN/System.err(541): at android.database.sqlite.SQLiteStatement.native_executeSql(Native Method)
01-25 23:04:47.329: WARN/System.err(541): at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:89)
01-25 23:04:47.359: WARN/System.err(541): at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1933)
01-25 23:04:47.359: WARN/System.err(541): at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1864)
01-25 23:04:47.389: WARN/System.err(541): at com.thesis.menubook.DBConnect$DatabaseHelper.onCreate(DBConnect.java:68)
01-25 23:04:47.398: WARN/System.err(541): at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:157)
01-25 23:04:47.398: WARN/System.err(541): at com.thesis.menubook.DBConnect.open(DBConnect.java:89)
01-25 23:04:47.448: WARN/System.err(541): at com.thesis.menubook.ChooseTable$GetTableDetails$1.run(ChooseTable.java:102)
01-25 23:04:47.448: WARN/System.err(541): at android.os.Handler.handleCallback(Handler.java:587)
01-25 23:04:47.448: WARN/System.err(541): at android.os.Handler.dispatchMessage(Handler.java:92)
01-25 23:04:47.448: WARN/System.err(541): at android.os.Looper.loop(Looper.java:132)
01-25 23:04:47.458: WARN/System.err(541): at android.app.ActivityThread.main(ActivityThread.java:4025)
01-25 23:04:47.471: WARN/System.err(541): at java.lang.reflect.Method.invokeNative(Native Method)
01-25 23:04:47.471: WARN/System.err(541): at java.lang.reflect.Method.invoke(Method.java:491)
01-25 23:04:47.499: WARN/System.err(541): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
01-25 23:04:47.499: WARN/System.err(541): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
01-25 23:04:47.499: WARN/System.err(541): at dalvik.system.NativeStart.main(Native Method)
01-25 23:04:47.751: DEBUG/AndroidRuntime(541): Shutting down VM
01-25 23:04:47.751: WARN/dalvikvm(541): threadid=1: thread exiting with uncaught exception (group=0x40014760)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): FATAL EXCEPTION: main
01-25 23:04:47.838: ERROR/AndroidRuntime(541): java.lang.IllegalArgumentException: Host name may not be null
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at org.apache.http.HttpHost.<init>(HttpHost.java:83)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at org.apache.http.impl.client.AbstractHttpClient.determineTarget(AbstractHttpClient.java:497)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at com.thesis.menubook.JSONParser.makeHttpRequest(JSONParser.java:62)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at com.thesis.menubook.ChooseTable$GetTableDetails$1.run(ChooseTable.java:119)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at android.os.Handler.handleCallback(Handler.java:587)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at android.os.Handler.dispatchMessage(Handler.java:92)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at android.os.Looper.loop(Looper.java:132)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at android.app.ActivityThread.main(ActivityThread.java:4025)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at java.lang.reflect.Method.invokeNative(Native Method)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at java.lang.reflect.Method.invoke(Method.java:491)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
01-25 23:04:47.838: ERROR/AndroidRuntime(541): at dalvik.system.NativeStart.main(Native Method)
01-25 23:04:47.950: WARN/ActivityManager(83): Force finishing activity com.thesis.menubook/.ChooseTable
01-25 23:04:48.575: WARN/ActivityManager(83): Activity pause timeout for ActivityRecord{408897c0 com.thesis.menubook/.ChooseTable}
01-25 23:04:52.609: INFO/Process(541): Sending signal. PID: 541 SIG: 9
01-25 23:04:53INFO.259: /ActivityManager(83): Process com.thesis.menubook (pid 541) has died.
01-25 23:04:53.279: ERROR/InputDispatcher(83): channel '4099fdb0 com.thesis.menubook/com.thesis.menubook.IPAddress (server)' ~ Consumer closed input channel or an error occurred. events=0x8
01-25 23:04:53.279: ERROR/InputDispatcher(83): channel '4099fdb0 com.thesis.menubook/com.thesis.menubook.IPAddress (server)' ~ Channel is unrecoverably broken and will be disposed!
01-25 23:04:53.420: INFO/WindowManager(83): WIN DEATH: Window{4099fdb0 com.thesis.menubook/com.thesis.menubook.IPAddress paused=false}
01-25 23:04:54.193: INFO/WindowManager(83): WIN DEATH: Window{408347c8 com.thesis.menubook/com.thesis.menubook.ChooseTable paused=false}
01-25 23:04:54.819: INFO/WindowManager(83): WIN DEATH: Window{407c8fa8 com.thesis.menubook/com.thesis.menubook.ChooseTable paused=false}
01-25 23:04:55.620: INFO/WindowManager(83): WINDOW DIED Window{4099fdb0 com.thesis.menubook/com.thesis.menubook.IPAddress paused=false}
01-25 23:04:55.690: ERROR/InputDispatcher(83): Received spurious receive callback for unknown input channel. fd=187, events=0x8
01-25 23:04:55.690: ERROR/InputDispatcher(83): Received spurious receive callback for unknown input channel. fd=190, events=0x8
01-25 23:04:56.698: WARN/InputManagerService(83): Got RemoteException sending setActive(false) notification to pid 541 uid 10004
01-25 23:04:58.078: WARN/ActivityManager(83): Launch timeout has expired, giving up wake lock!
01-25 23:04:59.405: DEBUG/dalvikvm(147): GC_EXPLICIT freed 2K, 4% free 12941K/13383K, paused 76ms+28ms
01-25 23:07:14.329: DEBUG/SntpClient(83): request time failed: java.net.SocketException: Address family not supported by protocol
01-25 23:08:58.401: DEBUG/dalvikvm(83): GC_CONCURRENT freed 1467K, 15% free 12265K/14279K, paused 28ms+36ms
01-25 23:12:14.398: DEBUG/SntpClient(83): request time failed: java.net.SocketException: Address family not supported by protocol
最佳答案
您有两个“创建”语句。其中一个包含
_id integer primary key autoincrement
根据文档，这是正确的。另一个有
recipe_ID integer primary key not null autoincrement
我怀疑额外的“not null”是问题所在。由于它是主键，因此它本质上应该是“not null”，因此这可能是您的语法错误。
您还可以使用调试器来找出导致问题的语句执行。每个 sql 语句执行周围的 try/catch block 可能也是一个好主意。
关于java - 为什么我的 Android 应用程序会关闭？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/14524871/