Question

我正在尝试创建包含多列的表。但我遇到了一些问题。这是我的代码：


    package com.edkul.vimal.edkul;

    import android.database.DatabaseErrorHandler;
    import android.database.sqlite.SQLiteDatabase;
    import android.database.sqlite.SQLiteOpenHelper;
    import android.database.Cursor;
    import android.content.Context;
    import android.content.ContentValues;

    public class DatabaseHandler extends SQLiteOpenHelper {

        private static final int DATABASE_VERSION = 1;
        private static final String DATABASE_NAME = "studentRecord.db";
        private static final String TABLE_STUDENT = "StudentRecords";
        private static final String COLUMN_ID = "_id";
        private static final String COLUMN_STUDENTNAME = "StudentName";
        private static final String COLUMN_EMAIL = "StudentEmail";
        private static final String COLUMN_PASSWORD = "StudentPassword";
        private static final String COLUMN_CPASSWORD = "StudentConfirmPassword";
        private static final String COLUMN_INSTITUTE = "InstituteName";
        private static final String COLUMN_CONTACTNO = "ContactInfo";

        public DatabaseHandler(Context context, String name, SQLiteDatabase.CursorFactory factory, int version) {
            super(context, DATABASE_NAME, factory, DATABASE_VERSION);
        }

        public DatabaseHandler(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_STUDENT + " ( " +
                    COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT " +
                    COLUMN_STUDENTNAME + " TEXT " +
                    COLUMN_EMAIL + " TEXT " +
                    COLUMN_PASSWORD + " TEXT " +
                    COLUMN_CPASSWORD + " TEXT " +
                    COLUMN_INSTITUTE + " TEXT " +
                    COLUMN_CONTACTNO + " TEXT " +
                    " ) ";
            db.execSQL(query);
        }

        @Override
        public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
            db.execSQL("DROP TABLE IF EXISTS" + TABLE_STUDENT);
            onCreate(db);
        }

        //add new row to the database
        public void addStudent(StudentRecord studentRecord){
            ContentValues values = new ContentValues();
            values.put(COLUMN_STUDENTNAME,studentRecord.get_Name());
            values.put(COLUMN_EMAIL,studentRecord.get_Email());
            values.put(COLUMN_PASSWORD,studentRecord.get_Password());
            values.put(COLUMN_CPASSWORD,studentRecord.get_Cpassword());
            values.put(COLUMN_INSTITUTE,studentRecord.get_Institute());
            values.put(COLUMN_CONTACTNO,studentRecord.get_Contact());
            SQLiteDatabase db = getWritableDatabase();
            db.insert(TABLE_STUDENT, null, values);
            db.close();
        }

        //Delete the student record from the table

        public void deleteStudent(String studentName){
            SQLiteDatabase db = getWritableDatabase();
            db.execSQL("DELETE FROM " + TABLE_STUDENT + "WHERE" + COLUMN_STUDENTNAME + "=\" "+ studentName + "\";");
        }

        // print the database as a string

        public String databaseToString(){
            String dbString = "";
            SQLiteDatabase db = getWritableDatabase();
            String query = "SELECT * FROM " + TABLE_STUDENT + "WHERE 1" ;
            Cursor c = db.rawQuery(query,null);
            c.moveToFirst();
            while (!c.isAfterLast()) {
                if (c.getString(c.getColumnIndex("studentName")) != null){
                    dbString += c.getString(c.getColumnIndex("studentName"));
                    dbString += "\n";
                }
            }
            db.close();
            return dbString;
        }
    }

com.edkul.vimal.edkul E/SQLiteLog: (1) near "Records": syntax error
com.edkul.vimal.edkul E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.edkul.vimal.edkul, PID: 1992 android.database.sqlite.SQLiteException: near "Records": syntax error (code 1): , while compiling: CREATE TABLE Student Records(_id INTEGER PRIMARY KEY AUTOINCREMENT Student Name TEXT Student Email TEXT Student Password TEXT Student Confirm Password TEXT Institute Name TEXT Contact Info TEXT )

我正在尝试使用6列创建表。但由于上述错误，我无法将条目插入数据库。

Answer 1

表格名称和表格列名称不应包含空格。因此，要么删除空格，要么用下划线（_）替换它。

如果要保留 Space ，请用双引号（"）包装名称。例如：

create table "abc xyz" ("first name" string);

修改您的query字符串应该有点像这样：

String query = "CREATE TABLE " + TABLE_STUDENT + " ( " + COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " + COLUMN_STUDENTNAME + " TEXT, " + COLUMN_EMAIL + " TEXT, " + COLUMN_PASSWORD + " TEXT, " + COLUMN_CPASSWORD + " TEXT, " + COLUMN_INSTITUTE + " TEXT, " + COLUMN_CONTACTNO + " TEXT" + ")";

如何在android sdk中修复表创建错误？

1 个答案: