Question

package helloworld;

import java.sql.Connection;
import java.sql.Statement;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.util.Random;

public class conn {

    private static final String USERNAME = "root";
    private static final String PASSWORD = "Jambone1";
    private static Statement stmt;
    private static Connection con;
    private static final String CONN_STRING = "jdbc:mysql://localhost:3307/students?autoReconnect=true&useSSL=false";

    public static void main(String[] args) throws SQLException {

        String[] name1 = {"HARRY" ,"JACK" ,"THOMAS", "ALFIE ","RILEY",
         "JAMES", "JOSHUA", "ETHAN", "SAMUEL", "DANIEL",
         };
        Random ran = new Random();

        try {
            con = DriverManager.getConnection(CONN_STRING, USERNAME, PASSWORD);
            System.out.println("done");
            con.setAutoCommit(false);
            stmt = (Statement) con.createStatement();
            String name;

            int salary = 100;
            int batchSize = 10;
            for (int i = 1; i <= batchSize; i++) {
                String insert = "INSERT INTO e(nr,name,salary) VALUES('" + i + 
                  "','" + name1 + "','" + salary + "')";
                stmt.addBatch(insert);
            }
            int[] results = stmt.executeBatch();
            System.out.println((results));
            con.commit();

        } catch (SQLException e) {
            System.err.println("did not work--> " + e);
        } finally {
            con.close();
            stmt.close();
        }
    }
}

如何使用此代码使代码将名称保存在数据库中。我发送到数据库，但不发送名称。这段代码将添加到数据库中，但是我希望名称随机化，并且它显示的不是保存为数字而是保存为数据库中的名称。

Answer 1

我建议使用preparedStatement

private PreparedStatement preparedStatement;

con = DriverManager.getConnection(url, user, password);
String stmt = "INSERT INTO e (nr, name, salary,) VALUES (?, ?, ?)";

for( i = 0 ; i < batchSize; i++ ) {
    preparedStatement = con.prepareStatement(stmt);
    preparedStatement.setInt(1, i);
    preparedStatement.setString(2, name1[i]);
    preparedStatement.setDouble(3, salary);
    preparedStatement.executeUpdate();
}

在Java中显示字符串的字符串数组

1 个答案: