Question

在我的应用程序中，我有一个数据库。虽然我可以成功插入表中，但我在更新字段时遇到问题。

此代码创建我的表：

public final static String[] TABLES_NAME = {"general", "toprecipes", "favorites", "shoppinglist"};
//-- Columns of table: shopping list
    public final static String[] CLM_SHOPPINGLIST = {COLUMN_ID, "resepiId", "resepiName", "ingredient", "status"};
    private final String CRT_TBL_SHOPPINGLIST = "CREATE TABLE " + TABLES_NAME[3] + " (" + 
        CLM_SHOPPINGLIST[0] + " INTEGER PRIMARY KEY AUTOINCREMENT," + 
        CLM_SHOPPINGLIST[1] + " TEXT," + 
        CLM_SHOPPINGLIST[2] + " TEXT," + 
        CLM_SHOPPINGLIST[3] + " TEXT," + 
        CLM_SHOPPINGLIST[4] + " TEXT"  + 
        ");";

我需要根据事件，将项目状态从“T”设置为“F”，反之亦然。

为了更新数据库，我有以下代码：

public void updateRecordStatus(String resepiName, String ingredientName, String status) {
        ContentValues cv = new ContentValues();
        cv.put(DatabaseHelper.CLM_SHOPPINGLIST[4], status);

        database.update(DatabaseHelper.TABLES_NAME[3], cv, DatabaseHelper.CLM_SHOPPINGLIST[2] + "=" + resepiName + " AND " + DatabaseHelper.CLM_SHOPPINGLIST[3] + "=" + ingredientName, null);

        Log.i(TAG, "Status of ingredient '" + ingredientName + "' updated to '" + status + "' in table.");
    }

似乎一切正常，但我不知道为什么 - 当我运行应用程序并想要更新时，它会崩溃。 Logcat显示这些消息并指向database.update(...)：

08-07 08:08:03.289: I/Database(460): sqlite returned: error code = 1, msg = near "Bakar": syntax error
08-07 08:08:03.289: E/Database(460): Error updating status=T using UPDATE shoppinglist SET status=? WHERE resepiName=Terung Bakar Mediterrinean AND ingredient=2 biji lemon
08-07 08:08:03.289: W/dalvikvm(460): threadid=1: thread exiting with uncaught exception (group=0x4001d800)
08-07 08:08:03.323: E/AndroidRuntime(460): FATAL EXCEPTION: main
08-07 08:08:03.323: E/AndroidRuntime(460): android.database.sqlite.SQLiteException: near "Bakar": syntax error: , while compiling: UPDATE shoppinglist SET status=? WHERE resepiName=Terung Bakar Mediterrinean AND ingredient=2 biji lemon
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:91)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:64)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:80)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteStatement.<init>(SQLiteStatement.java:36)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteDatabase.compileStatement(SQLiteDatabase.java:1145)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteDatabase.updateWithOnConflict(SQLiteDatabase.java:1671)
08-07 08:08:03.323: E/AndroidRuntime(460):  at android.database.sqlite.SQLiteDatabase.update(SQLiteDatabase.java:1622)
08-07 08:08:03.323: E/AndroidRuntime(460):  at com.astro.recipe.database.DBShoppingListHandler.updateRecordStatus(DBShoppingListHandler.java:107)
08-07 08:08:03.323: E/AndroidRuntime(460):  at com.astro.recipe.activities.ShoppingList$2.OnCheckChangedListener(ShoppingList.java:90)

任何意见或建议都将不胜感激。

Answer 1

字符串文字必须用单引号括起来。

例如：

Where you='jox' AND authenticated='1'

请记住，您和经过身份验证的是列名。

Answer 2

替换

 database.update(DatabaseHelper.TABLES_NAME[3], cv, DatabaseHelper.CLM_SHOPPINGLIST[2] + "=" + resepiName + " AND " + DatabaseHelper.CLM_SHOPPINGLIST[3] + "=" + ingredientName, null);

使用

 database.update(DatabaseHelper.TABLES_NAME[3], cv, DatabaseHelper.CLM_SHOPPINGLIST[2] + "= '" + resepiName + "' AND " + DatabaseHelper.CLM_SHOPPINGLIST[3] + "='" + ingredientName + "'", null);

Answer 3

database.update(DatabaseHelper.TABLES_NAME[3], cv, DatabaseHelper.CLM_SHOPPINGLIST[2] + "='" + resepiName + "' AND " + DatabaseHelper.CLM_SHOPPINGLIST[3] + "='" + ingredientName+"'", null);

尝试以上

为字符串添加单引号。

Answer 4

变化：

database.update(DatabaseHelper.TABLES_NAME[3], cv,
    DatabaseHelper.CLM_SHOPPINGLIST[2] + "=" + resepiName + " AND " +
    DatabaseHelper.CLM_SHOPPINGLIST[3] + "=" + ingredientName, null);

要：

database.update(DatabaseHelper.TABLES_NAME[3], cv,
   DatabaseHelper.CLM_SHOPPINGLIST[2] + " = ?" +
   " AND " + DatabaseHelper.CLM_SHOPPINGLIST[3] + " = ?",
   new String[]{resepiName, ingredientName});

这是使用带参数的sql语句的推荐方法（使用?）

如何更新数据库？

4 个答案: