enter code here正在创建一个显示列表视图中项目列表的应用程序和一个用于向列表视图添加更多项目的按钮，我想使用相同的按钮将这些新项目插入到SQLite数据库中。 / p>
我创建了一个包含2个冒号的表（ID，ITEM1），如下所示：
public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" ITEM1 TEXT) ";
db.execSQL(createTable);
}
但是当我向表中添加3个Colons时，我无法将任何数据插入数据库!!
我试图寻找解决方案，但没有任何机会在SQLite中是一个初学者，它让我感到困惑，我该如何解决这个问题？
这是
Database.java
package com.example.bilel.myapplication;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class DatabaseHelper extends SQLiteOpenHelper {
public static final String DATABASE_NAME ="foodlist.db";
public static final String TABLE_NAME="foodlist_data";
public static final String COL1 = "ID";
public static final String COL2 = "ITEM1";
public static final String COL3 = "CAL1";
public static final String COL4 = "PRO1";
public static final String COL5 = "CARB1";
public DatabaseHelper(Context context) {
super(context, DATABASE_NAME, null, 1);
}
@Override
public void onCreate(SQLiteDatabase db) {
/*String createTable = "CREATE TABLE " + TABLE_NAME + " (ID INTEGER PRIMARY KEY AUTOINCREMENT, " +
" ITEM1 TEXT) ";*/
String createTable = "CREATE TABLE" + TABLE_NAME + " (" +
COL1 + "ID INTEGER PRIMARY KEY AUTOINCREMENT," +
COL2 + "TEXT NOT NULL,"+
COL3 + "INTEGER NOT NULL,"+
COL4 + "INTEGER NOT NULL,"+
COL5 + "INTEGER NOT NULL);";
db.execSQL(createTable);
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP IF TABLE EXISTS"+TABLE_NAME);
onCreate(db);
}
///Add new row to the database
public boolean additems (String item,int C,int P,int R){
SQLiteDatabase db = this.getWritableDatabase();
ContentValues values = new ContentValues();
values.put(COL2,item);
values.put(COL3,C );
values.put(COL4,P);
values.put(COL5,R);
long result = db.insert(TABLE_NAME,null,values);
if (result==-1){
return false;
}else{
return true;
}
}
public void clearDatabase(String TABLE_NAME) {
String clearDBQuery = "DELETE FROM "+TABLE_NAME;
SQLiteDatabase db = this.getWritableDatabase();
db.execSQL(clearDBQuery);
}
public int LastInsert() {
SQLiteDatabase db = this.getReadableDatabase();
final String MY_QUERY = "SELECT MAX(" + COL1 + ") FROM " + TABLE_NAME;
Cursor cur = db.rawQuery(MY_QUERY, null);
cur.moveToFirst();
int ID = cur.getInt(0);
cur.close();
return ID;
}
public void LastDelete(){
//String clearROW = "DELETE FROM "+TABLE_NAME "WHERE " = "(SELECT MAX(id) FROM notes)";
SQLiteDatabase db = this.getWritableDatabase();
long id = LastInsert();
db.delete(TABLE_NAME,COL1+"=?",new String[]{Long.toString(id)});
db.close();
}
public Cursor getListContents(){
SQLiteDatabase db = this.getWritableDatabase();
Cursor data = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
return data;
}
}
崩溃日志
11-23 13:56:02.746 3926-3926/com.example.bilel.myapplication E/SQLiteLog: (1) near "TABLEfoodlist_data": syntax error
11-23 13:56:02.746 3926-3926/com.example.bilel.myapplication D/AndroidRuntime: Shutting down VM
11-23 13:56:02.747 3926-3926/com.example.bilel.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.bilel.myapplication, PID: 3926
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.bilel.myapplication/com.example.bilel.myapplication.CalculatorActivity}: android.database.sqlite.SQLiteException: near "TABLEfoodlist_data": syntax error (code 1): , while compiling: CREATE TABLEfoodlist_data (ID ID INTEGER PRIMARY KEY AUTOINCREMENT,ITEM1 TEXT NOT NULL,CAL1 INTEGER NOT NULL,PRO1 INTEGER NOT NULL,CARB1 INTEGER NOT NULL);
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
Caused by: android.database.sqlite.SQLiteException: near "TABLEfoodlist_data": syntax error (code 1): , while compiling: CREATE TABLEfoodlist_data (ID ID INTEGER PRIMARY KEY AUTOINCREMENT,ITEM1 TEXT NOT NULL,CAL1 INTEGER NOT NULL,PRO1 INTEGER NOT NULL,CARB1 INTEGER NOT NULL);
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
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:1677)
at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1608)
at com.example.bilel.myapplication.DatabaseHelper.onCreate(DatabaseHelper.java:42)
at android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked(SQLiteOpenHelper.java:251)
at android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelper.java:163)
at com.example.bilel.myapplication.DatabaseHelper.getListContents(DatabaseHelper.java:94)
at com.example.bilel.myapplication.CalculatorActivity.onCreate(CalculatorActivity.java:78)
at android.app.Activity.performCreate(Activity.java:6679)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1118)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2618)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)
at android.app.ActivityThread.-wrap12(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1477)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6119)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
答案 0 :(得分：1)
您必须在每种类型之前添加空格：
String createTable = "CREATE TABLE " + TABLE_NAME + " (" +
COL1 + " INTEGER PRIMARY KEY AUTOINCREMENT," +
COL2 + " TEXT NOT NULL,"+
COL3 + " INTEGER NOT NULL,"+
COL4 + " INTEGER NOT NULL,"+
COL5 + " INTEGER NOT NULL);";
并删除ID
答案 1 :(得分：0)
您是否升级了db版本？
private static final int DATABASE_VERSION = 2;//from 1 to 2
private static class OpenHelper extends SQLiteOpenHelper {
OpenHelper(Context context) // constructor
{
super(context, DATABASE_NAME, null, DATABASE_VERSION);
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
{
//Changes in db mentioned here
}
}
答案 2 :(得分：0)
尝试编写实际的SQL，直到您熟悉字符串连接。
CREATE TABLEfoodlist_data (ID ID INTEGER
您需要在表名周围添加空格，并将ID放两次。 （无论如何，你应该将其命名为_id）