Question

我正在尝试将我从EditText获取的值插入到Mysql数据库中，但我在＆＃34;附近有错误，＆＃34;我希望有人能澄清一下：

final SQLiteDatabase userDB = this.openOrCreateDatabase("Users",MODE_PRIVATE,null);

    final String fullNameText = fullName.getText().toString();

    final String stateText = state.getText().toString();

    final String zipcodeText = zipcode.getText().toString();

    saveUserInfo.setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            try
            {

                userDB.execSQL("CREATE TABLE IF NOT EXISTS allUsers (name VARCHAR, zipcode VARCHAR, state VARCHAR, id INTEGER PRIMARY KEY)");

                userDB.execSQL("INSERT INTO allUsers(name, zipcode, state) VALUES ( " + fullNameText + ", " + zipcodeText + ", " + stateText + ")");



                Cursor c = userDB.rawQuery("SELECT * FROM allUsers", null);

                int nameIndex = c.getColumnIndex("name");
                int zipcodeIndex = c.getColumnIndex("zipcode");
                int stateIndex = c.getColumnIndex("state");
                int idIndex = c.getColumnIndex("id");

                c.moveToFirst();

                while (c != null) {
                    Log.i("Name-", c.getString(nameIndex));
                    Log.i("Zipcode-", c.getString(zipcodeIndex));
                    Log.i("State-", c.getString(stateIndex));

                    Log.i("id", Integer.toString(c.getInt(idIndex)));

                    c.moveToNext();
                }

            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    });

错误记录

>06-20 17:21:38.498 5433-5433/com.haasith.creation.jantan W/System.err: android.database.sqlite.SQLiteException: near ",": syntax error (code 1): , while compiling: INSERT INTO allUsers(name, zipcode, state) VALUES ( , , )
>06-20 17:21:38.498 5433-5433/com.haasith.creation.jantan W/System.err: #################################################################
>06-20 17:21:38.498 5433-5433/com.haasith.creation.jantan W/System.err: Error Code : 1 (SQLITE_ERROR)
>06-20 17:21:38.498 5433-5433/com.haasith.creation.jantan W/System.err: Caused By : SQL(query) error or missing database.
>06-20 17:21:38.498 5433-5433/com.haasith.creation.jantan W/System.err:     (near ",": syntax error (code 1): , while compiling: INSERT INTO allUsers(name, zipcode, state) VALUES ( , , ))
>06-20 17:21:38.498 5433-5433/com.haasith.creation.jantan W/System.err: #################################################################

Answer 1

这是由：

引起的

final String fullNameText = fullName.getText().toString();

final String stateText = state.getText().toString();

final String zipcodeText = zipcode.getText().toString();

以上代码获取空字符串，因为您的OnClickListener未获得最新的fullNameText，stateText和zipcodeText值。

正确用法可能如下：

saveUserInfo.setOnClickListener(new View.OnClickListener()
{
    @Override
    public void onClick(View v)
    {
        try
        {

         final String fullNameText = fullName.getText().toString();

         final String stateText = state.getText().toString();

         final String zipcodeText = zipcode.getText().toString();

         userDB.execSQL("CREATE TABLE IF NOT EXISTS allUsers (name VARCHAR, zipcode VARCHAR, state VARCHAR, id INTEGER PRIMARY KEY)");

         userDB.execSQL("INSERT INTO allUsers(name, zipcode, state) VALUES ( " + fullNameText + ", " + zipcodeText + ", " + stateText + ")");

Answer 2

这是您的INSERT SQL

INSERT INTO allUsers(name, zipcode, state) VALUES ( " + fullNameText + ", " + zipcodeText + ", " + stateText + ")

结果字符串

INSERT INTO allUsers(name, zipcode, state) VALUES ( Name, ZipCode, StateText)

但是，您需要在SQL中引用该字符串。

INSERT INTO allUsers(name, zipcode, state) VALUES ( 'Name', 'ZipCode', 'StateText')

Answer 3

userDB.execSQL("INSERT INTO allUsers(name, zipcode, state) VALUES ( " + fullNameText + ", " + zipcodeText + ", " + stateText + ")");

问题是这个SQL查询。它需要你3个值，基本上是名称，邮政编码和状态。您在“值”部分中的语法错误。它必须是

userDB.execSQL("INSERT INTO allUsers(name, zipcode, state) VALUES ( fullNameText, zipcodeText, stateText)");

编辑：如果你想在每个值之前和之后想要空格，你可以写它。就像这样：＆＃34; ＆＃34; + fullNameText +＆＃34; ＆＃34;等等

将字符串插入db android时出现sqlite错误

3 个答案: