Android SQLite SELECT Query

android java sqlite

2022-09-01 17:57:08

我从a中获取值并将其设置在内部条件StringEditTextSELECT QUERY after WHERE

如

TextView tv = (TextView) findViewById(R.id.textView3);
EditTextet2 et = (EditText) findViewById(R.id.editText1);

String name = et.getText().toString();

Cursor c = db.rawQuery("SELECT * FROM tbl1 WHERE name = '"+name+"'", null); 

c.moveToNext();

tv.setText(c.getString(c.getColumnIndex("email")));

但它不起作用。有什么建议吗？

答案 1

尝试修剪字符串以确保没有多余的空格：

Cursor c = db.rawQuery("SELECT * FROM tbl1 WHERE TRIM(name) = '"+name.trim()+"'", null);

也像@thinksteep提到的那样使用。c.moveToFirst()

答案 2

这是 select 语句的完整代码。

SQLiteDatabase db = this.getReadableDatabase();
Cursor c = db.rawQuery("SELECT column1,column2,column3 FROM table ", null);
if (c.moveToFirst()){
    do {
        // Passing values 
        String column1 = c.getString(0);
        String column2 = c.getString(1);
        String column3 = c.getString(2); 
        // Do something Here with values
    } while(c.moveToNext());
}
c.close();
db.close();