?void?setInt(int?parameterIndex,?int?x)?throws?SQLException;

????/**
?????*?Sets?the?designated?parameter?to?the?given?Java?<code>long</code>?value.
?????*?The?driver?converts?this
?????*?to?an?SQL?<code>BIGINT</code>?value?when?it?sends?it?to?the?database.
?????*
?????*?@param?parameterIndex?the?first?parameter?is?1,?the?second?is?2,?...
?????*?@param?x?the?parameter?value
?????*?@exception?SQLException?if?parameterIndex?does?not?correspond?to?a?parameter
?????*?marker?in?the?SQL?statement;?if?a?database?access?error?occurs?or
?????*?this?method?is?called?on?a?closed?<code>PreparedStatement</code>
?????*/

api源代碼。jdbc不太懂的換可以先學(xué)學(xué)jdbc篇。

setInt(int parameterIndex, int x):方法

給指定的參數(shù)賦指定的值；

參數(shù)int parameterIndex是jdbc傳入sql語(yǔ)句中的每個(gè)問(wèn)號(hào)？的index；第一個(gè)問(wèn)號(hào)是1，第二個(gè)問(wèn)號(hào)是2…；

參數(shù)?int x是你設(shè)定的值，在這里傳的是變量id;

你好，String sql="select * from items where id=?;";這個(gè)是寫(xiě)了個(gè)sql語(yǔ)句，sql應(yīng)該懂吧，這里就是查items這個(gè)表里某個(gè)id的數(shù)據(jù)；stmt=conn.prepareStatement(sql);這句是調(diào)方法執(zhí)行這個(gè)sql語(yǔ)句，返回你要的數(shù)據(jù)，你就可以處理了。

望樓主采納！

執(zhí)行sql語(yǔ)句的基本步驟，暫時(shí)看不懂沒(méi)關(guān)系，依葫蘆畫(huà)瓢就好