利用QueryRunner类实现对数据库的增删改查操作，需要先导入jar包：commons-dbutils-1.6。利用QueryRunner类可以实现对数据步骤的简化。
1、添加
运用JDBC工具类实现连接：
package JDBCUtils;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
public class JDBCUtils {
private static Connection con;
private static String driver;
private static String url;
private static String username;
private static String password;
static {// 静态代码块只执行一次，获取一次信息即可
try {
readConfig();
Class.forName(driver);
con = DriverManager.getConnection(url, username, password);
} catch (Exception ex) {
throw new RuntimeException("数据库连接失败");
}
}
/*
* getClassLoader();返回该类的加载器
* getResourceAsStream();查找具有给定名称的资源
*/
private static void readConfig() {
InputStream in = JDBCUtils.class.getClassLoader().getResourceAsStream("JDBC.properties");
Properties pro = new Properties();
try {
pro.load(in);
} catch (IOException e) {
e.printStackTrace();
}
driver = pro.getProperty("driver");
url = pro.getProperty("url");
username = pro.getProperty("username");
password = pro.getProperty("password");
}
public static Connection getConnection() {
return con;
}
public static void close(Connection con) {
if (con != null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("con流关闭异常！");
}
}
}
public static void close(Connection con, Statement stat) {
if (stat != null) {
try {
stat.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("stat流关闭异常！");
}
}
if (con != null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("con流关闭异常！");
}
}
}
public static void close(Connection con, Statement stat, ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("rs流关闭异常！");
}
}
if (stat != null) {
try {
stat.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("stat流关闭异常！");
}
}
if (con != null) {
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
System.out.println("con流关闭异常！");
}
}
}
}
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import JDBCUtils.JDBCUtils;
public class add {
public static void main(String[] args) {
Connection con = null;
try {
con = JDBCUtils.getConnection();
QueryRunner qr = new QueryRunner();
String sql = "INSERT INTO student(studentno,sname,sex,birthday,classno,point,phone,email) VALUES(?,?,?,?,?,?,?,?)";
Object[] params = { "20191811", "Jack", "男", "1988-12-01",
"201901", "239", "16623540978", "Tom.@3218n.com" };
int num = qr.update(con, sql, params);
System.out.println("添加了" + num + "行");
} catch (SQLException e) {
throw new RuntimeException(e);
}
JDBCUtils.close(con);
}
}
2、删除
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import JDBCUtils.JDBCUtils;
public class DeleteDemo {
public static void main(String[] args) {
Connection con = null;
try {
con = JDBCUtils.getConnection();
QueryRunner qr = new QueryRunner();
String sql = "DELETE from Student where sname =?";
Object[] delete = { "Tom" };
qr.update(con, sql, delete);
} catch (SQLException e) {
throw new RuntimeException(e);
}
JDBCUtils.close(con);
}
}
3、修改
import java.sql.Connection;
import java.sql.SQLException;
import org.apache.commons.dbutils.QueryRunner;
import JDBCUtils.JDBCUtils;
public class UpdateDemo {
public static void main(String[] args) {
Connection con = null;
try {
con = JDBCUtils.getConnection();
QueryRunner qr = new QueryRunner();
String sql = "Update Student set classno=? Where sname='韩吟秋'";
Object[] update = { "201901" };
qr.update(con, sql, update);
} catch (SQLException e) {
throw new RuntimeException(e);
}
JDBCUtils.close(con);
}
}
4、查询
（1）
ArrayHandler： 将结果集的第一行存储到Object[]数组中
ArrayListHandler： 将结果集的每一行存储到Object[]数组中
import java.sql.Connection;
import java.sql.SQLException;
import java.util.Arrays;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.ArrayListHandler;
import JDBCUtils.JDBCUtils;
public class SeleteDemo {
public static void main(String[] args) {
Connection con = null;
try {
con = JDBCUtils.getConnection();
QueryRunner qr = new QueryRunner();
String sql = "Select * from Student where studentno=?";
Object[] select = { 20191811 };
List<Object[]> list = qr.query(con, sql, new ArrayListHandler(),
select);
// 将记录封装到一个装有Object[]的List集合中
for (Object[] arr : list) {
System.out.println(Arrays.toString(arr));
}
} catch (SQLException e) {
throw new RuntimeException(e);
}
JDBCUtils.close(con);
}
}
（2）
BeanHandler：结果集中第一条记录封装到一个指定的javaBean中。
BeanListHandler：结果集中每一条记录封装到javaBean中，再将javaBean封装到list集合中。