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57 lines
1.3 KiB
57 lines
1.3 KiB
package javabean;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.Statement;
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public class JDBCBean {
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private static String driver = "com.mysql.cj.jdbc.Driver";
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private static String url = "jdbc:mysql://localhost:3306/library?&useSSL=false&serverTimezone=UTC&userUnicode=true&characterEncoding=UTF-8";
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private static String username = "root";
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private static String password = "root";
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private Connection conn = null;
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private Statement stmt = null;
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public JDBCBean() {
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try {
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Class.forName(driver);
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conn = DriverManager.getConnection(url, username, password);
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stmt = conn.createStatement();
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System.out.println("同数据库建立连接！");
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} catch (Exception ex) {
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System.out.println("无法同数据库建立连接！");
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}
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}
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public int executeUpdate(String s) {
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int result = 0;
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try {
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System.out.println(s + "------" + stmt + "-----");
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result = stmt.executeUpdate(s);
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} catch (Exception e) {
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System.out.println("执行更新错误！");
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}
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return result;
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}
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public ResultSet executeQuery(String s) {
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ResultSet rs = null;
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try {
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rs = stmt.executeQuery(s);
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} catch (Exception e) {
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System.out.println("执行查询错误！ " + e.getMessage());
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}
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return rs;
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}
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public void close() {
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try {
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stmt.close();
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conn.close();
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} catch (Exception e) {
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}
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}
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}
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