为了方便静态SQL语句进行增删改查的操作，编写了一个工具类进行操作。
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class JdbcUtil {
// 定义数据库驱动
private static final String DRIVER_NAME = "oracle.jdbc.driver.OracleDriver";
// 获取URL
private static final String URL = "jdbc:oracle:thin:@172.22.246.26:1521:orcl";
// 获取用户名
private static final String USER = "java1";
// 获取密码
private static final String PASSWORD = "java1";
static {
try {
// 初始化JDBC驱动，并让驱动加载到JVM中
Class.forName(DRIVER_NAME);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/*
* 获取数据库连接对象
*/
public static Connection getConnection() {
Connection conn = null;
// 获取数据库连接
conn = DriverManager.getConnection(URL, USER, PASSWORD);
} catch (SQLException e) {
return conn;
* 更新数据库
public void update(String sql) {
Connection conn = getConnection();
Statement stmt = null;
if (conn != null) {
try {
stmt = conn.createStatement();
stmt.executeUpdate(sql);
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
close(stmt);
close(conn);
* 数据查询
public List<Map<String, Object>> query(String sql) {
List<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
ResultSet rs = null;
rs = stmt.executeQuery(sql);
// 获取结果集的列数， 为下面的for循环做准备
int count = rs.getMetaData().getColumnCount();
while (rs.next()) {
// 创建map，将我们每一行的值以键值对的形式（列-值）存储
Map<String, Object> map = new HashMap<String, Object>();
for (int i = 1; i <= count; i++) {
// 循环获取列名
String columnName = rs.getMetaData().getColumnName(i);
// 获取值，由于值的多样性，我们无法确定它是什么类型。
Object value = rs.getObject(i);
map.put(columnName, value);
}
list.add(map);
}
close(rs);
return list;
* 关闭对象
public static void close(Object o) {
if (o == null) {
return;
if (o instanceof ResultSet) {
((ResultSet) o).close();
} else if (o instanceof Statement) {
((Statement) o).close();
} else if (o instanceof Connection) {
((Connection) o).close();
}