JDBC SQLite 更新

Question

我是 jdbc sqlite 的新手。 我想知道如何执行更新。 例如，我有一个名为人名和职业的表。 我应该使用 PreparedStatement 吗？

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..

Answer 1

您没有“执行”更新。 您需要调用change.executeUpdate()以将 UPDATE 语句发送到引擎。

（正如 ZeroPage 指出的那样：删除;在 SQL 字符串中）

Answer 2

您可能需要检查Java 和 SQLite

帖子中的示例：

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，