jdbc ant run build.xml类路径 我在运行ant时遇到问题。当我直接跑出教室的时候 它编译并运行的文件如下 Jasons MacBook Pro:src js$java Hw5 学号:1 名字:杰森 姓氏:S 电话:555-220-5169 电邮:js@ucsd.edu 个人口号:永不说永不 下面的代码行在正确运行时使用,如上所述 Connection Connection=DriverManager.getConnection(“jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_jdbc/lib/Hw5Db”); 我的代码 导入java.sql.*; 导入java.util.Enumeration; 公共级Hw5{ 公共静态void main(字符串[]args){ 试一试{ Connection Connection=DriverManager.getConnection(“jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_jdbc/lib/Hw5Db”); //Connection Connection=DriverManager.getConnection(“jdbc:derby:Hw5Db”);//ant文件代码 语句Statement=connection.createStatement(); ResultSet ResultSet=statement.executeQuery(“从学生中选择*); while(resultSet.next()){ int studentID=resultSet.getInt(“学生ID”); String firstName=resultSet.getString(“firstName”); String lastName=resultSet.getString(“lastName”); String phone=resultSet.getString(“电话”); String email=resultSet.getString(“电子邮件”); String mantra=resultSet.getString(“个人标签”); System.out.println(“学生ID:+studentID+”\n“+ “名字:”+firstName+“\n”+ 姓氏:“+lastName+”\n+ 电话:“+电话+”\n+ 电子邮件:“+电子邮件+”\n+ “个人标语:“+咒语+”\n”); } resultSet.close(); 语句。close(); connection.close(); } 捕获(SQLException sqle){ System.err.println(“SQL异常:+sqle”); } } } 但是当我尝试使用build.xml时,我将下面的代码行更改为 Connection-Connection=DriverManager.getConnection(“jdbc:derby:Hw5Db”); 因为我认为数据库jar文件(Hw5Db)位于build.xml的类路径中 my build.xml Jasons MacBook Pro:HW5_JDBC jsteindorf$ant run Buildfile:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build.xml 准备: [mkdir]创建目录:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build [mkdir]创建目录:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin 汇编: [javac]将1个源文件编译为/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build [javac]/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/src/HW5.java 部署: [jar]构建jar:/Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/HW5.jar [jar]构建jar:/Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/Hw5Db.jar 运行: [java]SQL异常:java.SQL.SQLException:找不到适合jdbc的驱动程序:derby:Hw5Db 建设成功 总时间:2秒 我在努力,我就是不能让它工作
不确定,但您可能需要先注册驱动程序,然后再使用它jdbc ant run build.xml类路径 我在运行ant时遇到问题。当我直接跑出教室的时候 它编译并运行的文件如下 Jasons MacBook Pro:src js$java Hw5 学号:1 名字:杰森 姓氏:S 电话:555-220-5169 电邮:js@ucsd.edu 个人口号:永不说永不 下面的代码行在正确运行时使用,如上所述 Connection Connection=DriverManager.getConnection(“jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_jdbc/lib/Hw5Db”); 我的代码 导入java.sql.*; 导入java.util.Enumeration; 公共级Hw5{ 公共静态void main(字符串[]args){ 试一试{ Connection Connection=DriverManager.getConnection(“jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_jdbc/lib/Hw5Db”); //Connection Connection=DriverManager.getConnection(“jdbc:derby:Hw5Db”);//ant文件代码 语句Statement=connection.createStatement(); ResultSet ResultSet=statement.executeQuery(“从学生中选择*); while(resultSet.next()){ int studentID=resultSet.getInt(“学生ID”); String firstName=resultSet.getString(“firstName”); String lastName=resultSet.getString(“lastName”); String phone=resultSet.getString(“电话”); String email=resultSet.getString(“电子邮件”); String mantra=resultSet.getString(“个人标签”); System.out.println(“学生ID:+studentID+”\n“+ “名字:”+firstName+“\n”+ 姓氏:“+lastName+”\n+ 电话:“+电话+”\n+ 电子邮件:“+电子邮件+”\n+ “个人标语:“+咒语+”\n”); } resultSet.close(); 语句。close(); connection.close(); } 捕获(SQLException sqle){ System.err.println(“SQL异常:+sqle”); } } } 但是当我尝试使用build.xml时,我将下面的代码行更改为 Connection-Connection=DriverManager.getConnection(“jdbc:derby:Hw5Db”); 因为我认为数据库jar文件(Hw5Db)位于build.xml的类路径中 my build.xml Jasons MacBook Pro:HW5_JDBC jsteindorf$ant run Buildfile:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build.xml 准备: [mkdir]创建目录:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build [mkdir]创建目录:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin 汇编: [javac]将1个源文件编译为/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build [javac]/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/src/HW5.java 部署: [jar]构建jar:/Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/HW5.jar [jar]构建jar:/Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/Hw5Db.jar 运行: [java]SQL异常:java.SQL.SQLException:找不到适合jdbc的驱动程序:derby:Hw5Db 建设成功 总时间:2秒 我在努力,我就是不能让它工作,jdbc,ant,classpath,build.xml,Jdbc,Ant,Classpath,Build.xml,不确定,但您可能需要先注册驱动程序,然后再使用它 I'm having trouble running from ant. When I run straight from the class file as follows it compiles and runs Jasons-MacBook-Pro:src js$ java Hw5 Student ID: 1 First Name: Jason Last Name: S P
I'm having trouble running from ant. When I run straight from the class
file as follows it compiles and runs
Jasons-MacBook-Pro:src js$ java Hw5
Student ID: 1
First Name: Jason
Last Name: S
Phone: 555-220-5169
Email: js@ucsd.edu
Personal Tagline: Never say never
The following line of code is used when it runs correctly as above
Connection connection = DriverManager.getConnection("jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/lib/Hw5Db");
my code
import java.sql.*;
import java.util.Enumeration;
public class Hw5{
public static void main (String [] args){
try{
Connection connection = DriverManager.getConnection("jdbc:derby:/Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/lib/Hw5Db");
//Connection connection = DriverManager.getConnection("jdbc:derby:Hw5Db");//ant file code
Statement statement = connection.createStatement();
ResultSet resultSet = statement.executeQuery("SELECT * FROM STUDENT");
while(resultSet.next()){
int studentID = resultSet.getInt("STUDENT_ID");
String firstName = resultSet.getString("FIRSTNAME");
String lastName = resultSet.getString("LASTNAME");
String phone = resultSet.getString("PHONE");
String email = resultSet.getString("EMAIL");
String mantra = resultSet.getString("PERSONAL_TAGLINE");
System.out.println("Student ID: " + studentID + "\n" +
"First Name: " + firstName + "\n" +
"Last Name: " + lastName + "\n" +
"Phone: " + phone + "\n" +
"Email: " + email + "\n" +
"Personal Tagline: " + mantra + "\n");
}
resultSet.close();
statement.close();
connection.close();
}
catch(SQLException sqle){
System.err.println("SQL Exception: " + sqle);
}
}
}
but when I try from my build.xml i change the following line of code to
Connection connection = DriverManager.getConnection("jdbc:derby:Hw5Db");
because i think database jar file (Hw5Db) is in the classpath of my build.xml
my build.xml
<?xml version="1.0"?>
<project name="Hw5" default="compile" basedir=".">
<property environment="env"/>
<property name="src" value="${basedir}/src"/>
<property name="bin" value="${basedir}/bin"/>
<property name="lib" value="${basedir}/lib"/>
<property name="doc" value="${basedir}/doc"/>
<property name="build" value="${basedir}/build"/>
<target name="prepare" description="Setting up temporary directory to support build">
<mkdir dir="${build}"/>
<mkdir dir="${bin}"/>
</target>
<target name="compile" depends="prepare" description="compile java sources">
<javac srcdir="${src}" destdir="${build}" includes="**/*.java" listfiles="yes" includeantruntime="false">
</javac>
</target>
<target name="deploy" depends="compile">
<jar destfile="${bin}/Hw5.jar" basedir="${build}"/>
<jar destfile="${bin}/Hw5Db.jar" basedir="${lib}"/>
</target>
<target name="run" depends="deploy" description="run the project">
<java fork="true" classname="Hw5">
<classpath path="${bin}/Hw5.jar"/>
<classpath path="${bin}/Hw5Db.jar"/>
</java>
</target>
<target name="clean">
<delete dir="${build}"/>
<delete dir="${bin}"/>
</target>
</project>
Jasons-MacBook-Pro:HW5_JDBC jsteindorf$ ant run
Buildfile: /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build.xml
prepare:
[mkdir] Created dir: /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build
[mkdir] Created dir: /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin
compile:
[javac] Compiling 1 source file to /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/build
[javac] /Users/js/Desktop/JavaDevelopmentAnt/HW5_JDBC/src/Hw5.java
deploy:
[jar] Building jar: /Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/Hw5.jar
[jar] Building jar: /Users/jsteindorf/Desktop/JavaDevelopmentAnt/HW5_JDBC/bin/Hw5Db.jar
run:
[java] SQL Exception: java.sql.SQLException: No suitable driver found for jdbc:derby:Hw5Db
BUILD SUCCESSFUL
Total time: 2 seconds
I'm trying, I just can't get it to work
及之后:
Class.forName("class_of_driver").getInstance();
我觉得
java
任务上重复的classpath
有点奇怪。请尝试以下操作:
Connection connection = DriverManager.getConnection("jdbc:derby:./Hw5Db");
我解决了这个问题,build.xml找不到数据库驱动程序 classpath path=“${env.DERBY_HOME}/lib/DERBY.jar classpath path=“${env.DERBY_HOME}/lib/derbytools.jar 数据库的连接路径应该是
jdbc:derby:./lib/Hw5Db这对于JavaDB(作为JDK的一部分捆绑在一起)是不必要的。
<java fork="true" classname="Hw5">
<classpath path="${bin}/Hw5.jar:${bin}/Hw5Db.jar"/>
</java>