Jac*_*ack 0 android android-sqlite
我想循环遍历sqlite数据库if if(johnny)是否存在于数据库中,但我的代码不起作用
if(!cursor.isAfterLast())
{
do
{
for(int i = 0; i<cursor.getCount(); i++)
{
if("johnny" == cursor.getString(1))
{
Toast.makeText(getApplicationContext(), "string found!!! =)", Toast.LENGTH_LONG).show();
}
}
}
while (cursor.moveToNext());
}
cursor.close();
}
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用于比较使用.equals()即改变
if("johnny" == cursor.getString(1))
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至
if("johnny".equals(cursor.getString(1)))
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编辑
您可以使用这样的查询
Cursor objCursor = db.query("yourtableName",null, "columnName=?",
new String[] { "johnny" }, null, null, null, null);
if ((objCursor != null) && (objCursor.getCount() > 0)) {
Toast.makeText(getApplicationContext(), "string found!!! =)", Toast.LENGTH_LONG).show();
}
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注意:替换yourtableName为您的表名和columnName表的列名.