下面是源码:
package com.xmty.testmysql;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class Test {
public int getPushTime() {
int time = 0;
String dbDriver = "com.mysql.jdbc.Driver";
String dbUrl = "jdbc:mysql://localhost:3306/timetask?useUnicode=true&characterEncoding=UTF-8";
String dbUser = "root";
String dbPassword = "tiger";
Connection conn = null;
PreparedStatement stmt = null;
ResultSet rs = null;
try {
Class.forName(dbDriver);
conn = DriverManager.getConnection(dbUrl, dbUser, dbPassword);
// System.out.println(conn.isValid(0));
String sql = "select * from timeint";
stmt = conn.prepareStatement(sql);
rs = stmt.executeQuery(sql);
if (!rs.next()) {
time = rs.getInt("time");
}
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (null != conn) {
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
conn = null;
}
if (null != stmt) {
try {
stmt.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
stmt = null;
}
if (null != rs) {
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
rs = null;
}
}
System.out.println("取到的时间为:" + time);
return time;
}
public static void main(String[] args) {
new Test().getPushTime();
}
}
调试过了,数据库的连接,表的查询,都没有问题,问题就是返回的SesultSet中没有内容,确定表中存在需要的数据,将sql语句放在命令行中运行正常。
另外,打开eclipse的data Explore,能够连接数据库,但获取表数据提示语法错误。用的eclipse是64位的mars-2,mysql是mysql-installer-community-5.6.35.0。
有没有大神能够帮忙找出问题所在,拜谢了!