下面是一个简单的Java示例,展示了如何通过两个不同的连接URL连接到两个数据库: importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;publicclassMultiDbConnectionExample{publicstaticvoidmain(String[]args){StringdbUrlA="jdbc:mysql:/...
下面是一个使用Java执行SQL文件的示例代码: importjava.io.File;importjava.io.IOException;importjava.nio.charset.StandardCharsets;importjava.nio.file.Files;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;importjava.sql.Statement;publicclassExecuteSqlFileExample{publicstaticvoid...
importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;publicclassSelectExample{publicstaticvoidmain(String[]args){// JDBC连接参数String url="jdbc:mysql://localhost:3306/mydatabase";String username="root";String password="pass...
For example, the following code fragment specifies that the SQL type ATHLETES will be mapped to the class Athletes in the Java programming language. The code fragment retrieves the type map for the Connection object con, inserts the entry into it, and then sets the type map with ...
importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.SQLException;publicclassTransactionIsolationExample{publicstaticvoidmain(String[]args){String jdbcUrl="jdbc:mysql://localhost:3306/mydatabase";String username="root";String password="password";try(Connection connection=DriverManager.getConnec...
import java.sql.Statement; import java.sql.SQLException; public class MySQLConnectionExample { public static void main(String[] args) { Connection conn = null; Statement stmt = null; try { // 1. 加载并注册JDBC驱动 Class.forName("com.mysql.cj.jdbc.Driver"); ...
连接oracle的时候,要导入oracle驱动的jar包。 连接的时候,有statement和preparedstatement两种,从代码中可以看出不同。 example: 1packagecom.jdbc.oracle;23importjava.sql.Connection;4importjava.sql.DriverManager;5importjava.sql.PreparedStatement;6importjava.sql.ResultSet;7importjava.sql.SQLException;8importjava.sq...
importjava.sql.*; importjava.util.Random; publicclassTestSqlInsert{ @Test publicvoidinsert()throwsSQLException { Connectionconn=null; // 1.获取conn conn = Util.getConn(); // 2.sql 语句,占位符 Stringsql="INSERT INTO example (`name`, `age`) VALUES (?, ?)"; ...
详解Java的JDBC API的存储过程与SQL转义语法的使用 正如一个Connection对象创建Statement和PreparedStatement对象,它也创造了CallableStatement对象这将被用来执行调用数据库存储过程。 创建CallableStatement对象: 假设,需要执行以下Oracle存储过程: CREATE OR REPLACE PROCEDURE getEmpName ...
mvn exec:java -Dexec.mainClass="com.example.demo.DemoApplication"。 应用程序应连接到 Azure Cosmos DB for PostgreSQL,创建数据库架构,然后关闭连接,如控制台日志中所示: 输出 复制 [INFO ] Loading application properties [INFO ] Connecting to the database [INFO ] Database connection test: citus [...