展示连接后查询的效果:
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步骤:
(1)安装PostgreSQL数据库(GeoServer和PostGIS安装配置
);
(2)根据安装的PostgreSQL版本下载驱动jar,下载地址:https://jdbc.postgresql.org/download.html;
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(3)在MyEclipse中新建Java Project,新建lib文件夹,将下载的jar驱动包拖到文件夹中。
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(4)将jar驱动包添加到Libraries
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点击Add Class Folder
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(5)编写代码测试连接数据库
package DB;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class test {
public static void main(String[] args) {
Connection connection=null;
Statement statement =null;
try{
String url="jdbc:postgresql://127.0.0.1:5432/DB";
String user="postgres";
String password = "123456789";
Class.forName("org.postgresql.Driver");
connection= DriverManager.getConnection(url, user, password);
System.out.println("是否成功连接pg数据库"+connection);
String sql="select name from city";
statement=connection.createStatement();
ResultSet resultSet=statement.executeQuery(sql);
while(resultSet.next()){
String name=resultSet.getString(1);
System.out.println(name);
}
}catch(Exception e){
throw new RuntimeException(e);
}finally{
try{
statement.close();
}
catch(SQLException e){
e.printStackTrace();
throw new RuntimeException(e);
}finally{
try{
connection.close();
}
catch(SQLException e){
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
}
}
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