Java jdbcsqlite更新
我是JDBCSQLite的新手。我想知道如何执行更新。例如,我有一个名为people name的表,里面有职业。我应该使用准备好的报表吗Java jdbcsqlite更新,java,sqlite,jdbc,Java,Sqlite,Jdbc,我是JDBCSQLite的新手。我想知道如何执行更新。例如,我有一个名为people name的表,里面有职业。我应该使用准备好的报表吗 PreparedStatement change = conn.prepareStatement("Update people set name = ? "); change.setString(1, "John"); ResultSet rs = stat.executeQuery("select * from people where name = 'G
PreparedStatement change = conn.prepareStatement("Update people set name = ? ");
change.setString(1, "John");
ResultSet rs = stat.executeQuery("select * from people where name = 'Gandhi';");
while (rs.next()) {
System.out.println("name = " + rs.getString("name"));
System.out.println("job = " + rs.getString("occupation"));
}
rs.close();
conn.close();
我想问一下正确的方法。谢谢您。您可能需要查看
文章中的例子:
package com.rungeek.sqlite;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
public class Test {
public static void main(String[] args) throws Exception {
Class.forName("org.sqlite.JDBC");
Connection conn = DriverManager.getConnection("jdbc:sqlite:test.db");
Statement stat = conn.createStatement();
stat.executeUpdate("drop table if exists people;");
stat.executeUpdate("create table people (name, occupation);");
PreparedStatement prep = conn.prepareStatement(
"insert into people values (?, ?);");
prep.setString(1, "Gandhi");
prep.setString(2, "politics");
prep.addBatch();
prep.setString(1, "Turing");
prep.setString(2, "computers");
prep.addBatch();
prep.setString(1, "Wittgenstein");
prep.setString(2, "smartypants");
prep.addBatch();
conn.setAutoCommit(false);
prep.executeBatch();
conn.setAutoCommit(true);
ResultSet rs = stat.executeQuery("select * from people;");
while (rs.next()) {
System.out.println("name = " + rs.getString("name"));
System.out.println("job = " + rs.getString("occupation"));
}
rs.close();
conn.close();
}
}
谢谢,您不是在“执行”更新。您需要调用change.executeUpdate()
,以便将UPDATE语句发送到引擎
(正如ZeroPage所指出的:删除SQL字符串中的
;
)在我看来很好。这个代码不适合你吗?怎么不呢?不要用“;”来结束你的陈述这在JDBC中是不必要的。是的,PreparedStatement很好,但是您似乎没有对'change'语句运行execute()。您可能需要在update语句中添加一个where
子句。有一个WTF正在等待发生。始终在finally
块中关闭非托管资源,如连接和结果集。在finally
块中关闭非托管资源,如连接。这对我很有帮助。非常感谢。