SQLite查询不适用于串联字符串

Question

Here is the code of my android app where I use SQLite:

String wordInQuotes = "\"" + inputWord + "\"";
String query = "select * from table where col = " +wordInQuotes + ";";
Cursor cursor = database.rawQuery(query, null);

This gives me no results. Whereas if I remove the concatenation,

 String query = "select * from table where col = \"apple\" ;";

it works perfectly. So how do I write a query where I can replace the column value dynamically?

Answer 1

Try this it will work

for exact input

String query = "select * from table where col = '" +inputword + "'";

for input start from end

String query = "select * from table where col = '" +inputword + "%'";

for input start from starting point

String query = "select * from table where col = '%" +inputword + "'";

for input contains any where in column

String query = "select * from table where col = '%" +inputword + "%'";

execute query

Cursor cursor = database.rawQuery(query, null);

Answer 2

String query = "select * from table where col = \""+value+"\" ";

Answer 3

String query = "select * from table where col ='" +inputWord + "'";