Gbase8s如何配置Druid连接池（java.sql.SQLException: unknown jdbc driver : jdbc:gbasedbt-sql）
今天测试使用Druid连接池来连接Gbase8s
遇到了以下错误：
三月 02, 2024 8:43:31 下午 com.alibaba.druid.pool.DruidDataSource error
严重: {dataSource-1} init error
java.sql.SQLException: unknown jdbc driver : jdbc:gbasedbt-sql://192.168.1.100:9088/mydb:GBASEDBTSERVER=gbase01
at com.alibaba.druid.util.JdbcUtils.getDriverClassName(JdbcUtils.java:533)
获得连接出异常!!!
at com.alibaba.druid.pool.DruidDataSource.resolveDriver(DruidDataSource.java:1204)
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:888)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1403)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1399)
at com.panda.com.gbasedbt.orm.DBUtil.getConnection(DBUtil.java:49)
at com.panda.com.gbasedbt.orm.UserDao.updateById2(UserDao.java:187)
at com.panda.com.gbasedbt.orm.TestUserDao.main(TestUserDao.java:51)
一、演示失败案例（将forname,url,username,password放在jdbc.properties文件里）
1.加载Gbase8s驱动，加载Druid.1.2.9.jar驱动
2.创建jdbc.properties
driverClass=com.mysql.jdbc.Driver url=jdbc:gbasedbt-sql://192.168.1.100:9088/mydb:GBASEDBTSERVER=gbase01 username=gbasedbt password=123456 # ----- 加入druid的一些连接配置 # initialSize=10 #最大连接数量 maxActive=50 # minIdle=5 # maxWait=5000
3.创建DButil
package com.panda.com.gbasedbt.orm;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import java.io.File;
import java.io.InputStream;
import java.lang.reflect.Field;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
/**
* --- 天道酬勤 ---
*
* @author QiuShiju
* @desc
*/
public class DBUtil {
// 创建Properties类对象,专用于操作properties文件
private static final Properties properties = new Properties( );
// 声明Druid连接池的连接池对象
// 数据连接,一般称作数据源 dataSource
private static DruidDataSource dataSource;
static {
try {
InputStream inputStream = DBUtil.class.getResourceAsStream("/jdbc.properties");
properties.load(inputStream);
// 不需要由我们加载驱动
// 需要给dataSource赋值
dataSource = (DruidDataSource) DruidDataSourceFactory.createDataSource(properties);
} catch (Exception e) {
System.out.println("加载驱动异常!!");
e.printStackTrace( );
}
}
public static Connection getConnection() {
Connection conn = null;
try {
// 不需要我们获得连接
// 而是通过Druid获得
conn = dataSource.getConnection( );
} catch (Exception e) {
System.out.println("获得连接出异常!!!");
e.printStackTrace( );
}
return conn;
}
/**
* 关闭所有流
*/
public static void closeAll(Connection conn, Statement s) {
if (conn != null) {
try {
conn.close( );
} catch (SQLException throwables) {
throwables.printStackTrace( );
}
}
if (s != null) {
try {
s.close( );
} catch (SQLException throwables) {
throwables.printStackTrace( );
}
}
}
public static void closeAll(Connection conn, Statement s, ResultSet rs) {
if (conn != null) {
try {
conn.close( );
} catch (SQLException throwables) {
throwables.printStackTrace( );
}
}
if (s != null) {
try {
s.close( );
} catch (SQLException throwables) {
throwables.printStackTrace( );
}
}
if (rs != null) {
try {
rs.close( );
} catch (SQLException throwables) {
throwables.printStackTrace( );
}
}
}
/**
* 封装查询方法,返回一个对象
* 参数1 执行查询的SQL,预处理的,条件用?占位
* select * from tb_user where id = ? and username = ? and password = ?
* 参数2 结果要封装的类
* 参数3 给?赋值,不定长参数,是数组
* 1,admin,123456
*/
public static T selectOne(String sql, Class t, Object... args) {
Connection conn = getConnection( );
PreparedStatement ps = null;
ResultSet rs = null;
T target = null;
try {
ps = conn.prepareStatement(sql);
for (int i = 0; args != null && i < args.length; i++) {
ps.setObject(i + 1, args[i]);
}
rs = ps.executeQuery( );
/**
* 创建对象
* 从数据库取出数据,并设置对象属性
*/
while (rs.next( )) {
target = t.newInstance( );
Field[] declaredFields = t.getDeclaredFields( );
for (int i = 0; i < declaredFields.length; i++) {
Field field = declaredFields[i];
Object value = rs.getObject(field.getName( ));
// 破解私有
field.setAccessible(true);
// 给对象的该字段赋值
field.set(target, value);
}
}
} catch (Exception e) {
e.printStackTrace( );
} finally {
closeAll(conn, ps, rs);
}
return target;
}
public static List selectAll(String sql, Class t, Object... args) {
Connection conn = getConnection( );
PreparedStatement ps = null;
ResultSet rs = null;
T target = null;
ArrayList list = new ArrayList<>( );
try {
ps = conn.prepareStatement(sql);
for (int i = 0; args != null && i < args.length; i++) {
ps.setObject(i + 1, args[i]);
}
rs = ps.executeQuery( );
/**
* 创建对象
* 从数据库取出数据,并设置对象属性
*/
while (rs.next( )) {
target = t.newInstance( );
Field[] declaredFields = t.getDeclaredFields( );
for (int i = 0; i < declaredFields.length; i++) {
Field field = declaredFields[i];
Object value = rs.getObject(field.getName( ));
// 破解私有
field.setAccessible(true);
// 给对象的该字段赋值
field.set(target, value);
}
list.add(target);
}
} catch (Exception e) {
e.printStackTrace( );
} finally {
closeAll(conn, ps, rs);
}
return list;
}
/**
* 增删改方法一样
*/
public static boolean update(String sql, Object... args) {
Connection conn = getConnection( );
PreparedStatement ps = null;
int num = 0;
try {
ps = conn.prepareStatement(sql);
for (int i = 0; args != null && i < args.length; i++) {
ps.setObject(i + 1, args[i]);
}
num = ps.executeUpdate( );
} catch (Exception e) {
e.printStackTrace( );
} finally {
closeAll(conn, ps);
}
return num > 0 ? true : false;
}
}
4.测试报错：java.sql.SQLException: unknown jdbc driver
三月 02, 2024 8:43:31 下午 com.alibaba.druid.pool.DruidDataSource error
严重: {dataSource-1} init error
java.sql.SQLException: unknown jdbc driver : jdbc:gbasedbt-sql://192.168.1.100:9088/mydb:GBASEDBTSERVER=gbase01
at com.alibaba.druid.util.JdbcUtils.getDriverClassName(JdbcUtils.java:533)
获得连接出异常!!!
at com.alibaba.druid.pool.DruidDataSource.resolveDriver(DruidDataSource.java:1204)
at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:888)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1403)
at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:1399)
at com.panda.com.gbasedbt.orm.DBUtil.getConnection(DBUtil.java:49)
at com.panda.com.gbasedbt.orm.UserDao.updateById2(UserDao.java:187)
at com.panda.com.gbasedbt.orm.TestUserDao.main(TestUserDao.java:51)
二，演示成功案例
参考：Linux下Druid连接池GBase 8s数据库配置_druid 配置连接kingbase8-CSDN博客
1.创建Druid.properties文件（不包含url,username,password的配置信息）
maxWait=12000 testWhileIdle=true testOnBorrow=true timeBetweenEvictionRunsMillis=60000 validationQueryTimeout=30000 defaultAutoCommit=true removeAbandoned = true removeAbandonedTimeout = 180 poolPreparedStatements = true maxOpenPreparedStatements = 100
2.将url,usrname,password直接写在DBUtil文件,执行成功
package com.panda.com.gbasedbt.orm;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.pool.DruidDataSourceFactory;
import com.gbasedbt.DButil.DBUtil;
import javax.sql.DataSource;
public class druid_test {
//private static String DRUIDPool = "Druid.properties";
public static void main(String[] args) throws IOException, SQLException{
DruidDataSource dds = initDruidDataSource();
PreparedStatement pStat = null;
ResultSet rs = null;
Connection conn = dds.getConnection();
conn.setAutoCommit(false);
pStat = conn.prepareStatement("insert into tb_user(id) values(?)");
pStat.setInt(1, 1);
pStat.executeUpdate();
conn.commit();
Statement stat = conn.createStatement();
rs = stat.executeQuery("select count(*) from tb_user");
while (rs.next()) {
System.out.println("total insert " + rs.getInt(1) + " rows");
}
rs = stat.executeQuery("select * from t1 where 1=0");
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
for (int i = 0; i < columnCount; i++) {
System.out.println(rsmd.getColumnName(i+1) + "\t");
}
closeAll(null, pStat, conn);
}
public static DruidDataSource initDruidDataSource() {
Properties p = new Properties();
//FileInputStream fi = null;
InputStream fi=null;
DruidDataSource source = null;
try{
fi = DBUtil.class.getResourceAsStream("/Druid.properties");
// fi = new FileInputStream("DRUIDPool");
p.load(fi);
String DRIVER = "com.gbasedbt.jdbc.Driver";
String URL = "jdbc:gbasedbt-sqli://192.168.1.100:9088/mydb:GBASEDBTSERVER=gbase01";
String USERNAME = "gbasedbt";
String PASSWORD = "123456";
source = (DruidDataSource)DruidDataSourceFactory.createDataSource(p);
System.out.println(source.getMaxOpenPreparedStatements());
System.out.println(source.isPoolPreparedStatements());
source.setUrl(URL);
source.setUsername(USERNAME);
source.setPassword(PASSWORD);
source.setDriverClassName(DRIVER);
source.setInitialSize(5);
source.setMaxActive(10);
source.setMinIdle(5);
source.setValidationQuery("SELECT 1 from dual");
p.clear();
p = null;
}catch(Exception e){
e.printStackTrace();
}finally{
try {
if (fi!=null){
fi.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return source;
}
public static void closeAll(ResultSet rs, PreparedStatement stat, Connection conn) {
if (rs != null)
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
if (stat != null)
try {
stat.close();
} catch (SQLException e) {
e.printStackTrace();
}
if (conn != null)
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}