[英]Establish connection between app server and oracle database using java
[英]How to establish connection between Java Program and Database without using IDE/ External Tools?
我想编写一个Java程序来建立Java程序和数据库之间的连接,但是我不想使用任何IDE(例如Netbeans,Eclipse,Visual Studio,XAMP等)。我具有所需DBMS驱动程序的jar文件。
public class JDBCDemo { public static void main(String args[]) { try { /** * Steps for Establishing Connection between Java Application and Database */ //1. Load and Reginster Driver Class.forName("com.mysql.jdbc.Driver"); //2. Establish a connection between Java Application and Database Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/practicals", "root", "root123"); //3. Create Statement Object Statement st = con.createStatement(); //4. Send and Execute SQL queries ResultSet rs = st.executeQuery("SELECT * FROM tushar"); //5. Process the result from ResultSet object while(rs.next()) { System.out.println(rs.getString(1)); } //6. Close the Connection con.close(); } catch(Exception e) { System.out.println(e.toString().trim()); } } }
它显示错误java.lang.ClassNotFoundException:com.mysql.jdbc.Driver
如何建立连接?
在运行程序之前,需要在类路径中添加mysql驱动程序jar。
有多种方法可以做到这一点。
javac -cp“ JAR_PATH” ClassName.java java -cp“ JAR_PATH” ClassName
将jar文件添加到C:\\ Program Files \\ Java \\\\ jre \\ lib \\ ext
设置classpath = PATH_TO_JAR;
colon(:) is compulsory after jar file name
编译程序
javac -cp mysql-connector.jar:ProgramFileName.java
javac -cp mysql-connector.jar:JDBCDemo.java
运行程序
java -cp mysql-connector.jar:ProgramFileName
java -cp mysql-connector.jar:JDBCDemo
注意:-在使用其他jar文件执行其他操作时可以应用Simillar。
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