SQLite语法错误在“％”附近

Question

I get this error

android.database.sqlite.SQLiteException: near "%": syntax error: , while compiling: SELECT _id, word, meaning FROM todo WHERE KEY_WORD = +%D9%84

for this

database.query(DATABASE_TABLE, new String[] {
            KEY_ROWID, KEY_WORD, KEY_MEANING }, "KEY_WORD = " +word, null, null,
            null, null,null);

when word is +%D9%84

Answer 1

You have to escape the SQL query. To do this, use the selectionArgs field (right after "KEY_WORD = " +word in your code). It will replace any ? in the selection field with its elements:

database.query(DATABASE_TABLE, new String[] {
  KEY_ROWID, KEY_WORD, KEY_MEANING }, KEY_WORD + " = ?", new String[] { word },
  null, null, null, null);

For more details, read this .

Answer 2

您必须在单词上加上"字符”。如果要使用通配符，则必须使用like比较运算符代替= 。