package com.qf.jdbc; import java.sql.*; import java.util.Scanner; public class Demo3_LoginPlus { public static void main(String[] args) throws Exception { Scanner scanner = new Scanner(System.in); System.out.println("=== 欢迎登录天地银行 ===" ); System.out.println("请输入用户名: "...
15 sharding.jdbc.config.sharding.tables.<logic-table-name>.database-strategy.standard.sharding-column= #分片列名称 16 sharding.jdbc.config.sharding.tables.<logic-table-name>.database-strategy.standard.precise-algorithm-class-name= #精确分片算法类名称,用于=和IN。该类需实现PreciseShardingAlgorithm接口并...
#{ } 解析为一个 JDBC 预编译语句(prepared statement)的参数标记符。 ${ } 仅仅为一个纯碎的 string 替换,在动态 SQL 解析阶段将会进行变量替换 例如,sqlMap 中如下的 sql 语句,解析前后为: select*fromuserwherename=#{name};select*fromuserwherename=?; 一个#{ } 被解析为一个参数占位符 ? 。 当我...
1、读取配置文件中的参数 privatestaticString driver = ReadPropertiesUtils.getValue("jdbc.driver","data.properties");privatestaticString url = ReadPropertiesUtils.getValue("jdbc.url","data.properties");privatestaticString userName = ReadPropertiesUtils.getValue("jdbc.userName","data.properties");private...
经常不清楚需要传入多少个参数到 IN () 里面,下面是简单方法: 方法1 - in (SELECT * FROM unnest(?)) ) Integer[] ids={1,2,3}; try { PreparedStatement pst=conn.prepareStatement("select * from emp where id in (SELECT * FROM unnest(?))"); ...
JDBC链接数据库,动态sql条件查询in查询防止sql注入; 2019-12-25 17:41 −// 表创建状态if (StringUtils.isNotBlank(qo.getTabCreateStatus())) { String[] statusArr =qo.getTabCreateStatus().split(","); pageSql += " and b.tab_create... ...
DriverManager :依据数据库的不同,管理JDBC驱动 Connection :负责连接数据库并担任传送数据的任务 Statement :由 Connection 产生、负责发送执行SQL语句 ResultSet:负责保存Statement执行后所产生的查询结果 2.JDBC操作数据库的步骤 2.1总体步骤 1. 加载一个Driver驱动 ...
package JDBC; import java.sql.*; import java.util.Scanner; public class dengLu { public static void main(String[] args) throws Exception{ Scanner s=new Scanner(System.in); System.out.println("请输入用户名"); String uname=s.next(); ...
JDBC (Java Database Connectivity)is anAPIin Java that allows applications to interact with databases. You can establish a JDBC connection, execute queries, and retrieve results using a few simple commands. Here’s a simple example of a JDBC connection: ...