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如何在Android中的SQlite中使用预准备语句？

我有一个函数,它在SQLite数据库中的表上执行查询.我宣布一个常数:public static final String CANADA_HISTORY = "Canada's History";.这存储在一个String变量中,比方说difficulty,

我有一个问题:

Cursor c = mDb.rawQuery("select * from Questions_answers where CHAPTERS = '"+difficulty+"'" , null);

它在撇号附近抛出异常.

Logcat输出:

I/Database( 1170): sqlite returned: error code = 1, msg = near "s": syntax error
D/AndroidRuntime( 1170): Shutting down VM
W/dalvikvm( 1170): threadid=1: thread exiting with uncaught exception (group=0x40015560)
E/AndroidRuntime( 1170): FATAL EXCEPTION: main
E/AndroidRuntime( 1170): android.database.sqlite.SQLiteException: near "s": syntax error: , while compiling: select * from Questions_answers where CHAPTERS  = …