Bei Verwendung der dualen Datenquellen MySQL und SQLserver im SpringBoot-Projekt wird beim Ausführen ein Fehler gemeldet
com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'DUAL' 无效
nested exception is org.apache.ibatis.exceptions.PersistenceException:
### Error querying database.
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException:
Failed to obtain JDBC Connection; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'DUAL' 无效。
### The error may exist in file [D:\workspace(IDEA)\xxxx\xxx\target\classes\mapper\xxx\xxx.xml]
### The error may involve com.xxx.xxx.mapper.xxx.countMaleXunwu
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection;
nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'DUAL' 无效。
com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'DUAL' 无效。
### Error querying database.
Cause: org.springframework.jdbc.CannotGetJdbcConnectionException:
Failed to obtain JDBC Connection; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'DUAL' 无效。
### The error may exist in file [D:\workspace(IDEA)\xxx\xxx\target\classes\mapper\xxx\xxx.xml]
### The error may involve com.xxx.xxx.xxx.xxxx.countMaleXunwu
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: 对象名 'DUAL' 无效。]
15:24:52.057 [Druid-ConnectionPool-Create-1458706578] ERROR c.a.d.p.DruidDataSource - [run,2787] - create connection SQLException, url: jdbc:sqlserver://127.0.0.1:1433;DatabaseName=test, errorCode 208, state S0002
Wir suchen global in unserem eigenen Code nach diesem DUAL und verwenden diese Anweisung in Druid nur, um die Datenbankverbindungsinformationen zu überprüfen.
Der Grund für den Fehler:druid Überprüfen Sie die Gültigkeit von SQL und fügen Sie die folgende Konfiguration zur Datei application.prppertis hinzu
# 配置检测连接是否有效,用来检测连接是否有效的sql,要求是一个查询语句(mybatis)
validationQuery: SELECT 1 FROM DUAL
Es kann normal unter MySQL verwendet werden und gibt 1 zurück. MySQL hat das Objekt DUAL.
Allerdings verfügt der SQL-Server nicht über das Objekt DUAL, was bedeutet, dass diese Anweisung nicht unter dem SQL-Server ausgeführt werden kann und daher ein Fehler gemeldet wird.
Lösung
Ändern
validationQuery: SELECT 1
Importieren Sie das Salserver-Treiberpaket
<!-- SqlServer驱动包 -->
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
Die vollständige Konfiguration von yml lautet wie folgt:
# 数据源配置
spring:
datasource:
# 数据库连接池 统一使用com.zaxxer.hikari.HikariDataSource;不使用com.alibaba.druid.pool.DruidDataSource
type: com.zaxxer.hikari.HikariDataSource
driverClassName: com.mysql.cj.jdbc.Driver
druid:
# 主库数据源
master:
url: jdbc:mysql://${DB_HOST:XX}:${DB_PORT:3306}/${DB_NAME:XX}?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf8&zeroDateTimeBehavior=convertToNull
username: ${DB_USER:XX}
password: ${DB_PWD:XX}
# 从库数据源
sqlserver:
# 从数据源开关/默认关闭
enabled: true
driverClassName: com.microsoft.sqlserver.jdbc.SQLServerDriver # :${DB_PORT:1433}
url: jdbc:sqlserver://XX:1433;DatabaseName=XX
username: XX
password: XX
# 初始连接数
initialSize: 5
# 最小连接池数量
minIdle: 10
# 最大连接池数量
maxActive: 20
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置连接超时时间
connectTimeout: 30000
# 配置网络超时时间
socketTimeout: 60000
# 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间,单位是毫秒
minEvictableIdleTimeMillis: 300000
# 配置一个连接在池中最大生存的时间,单位是毫秒
maxEvictableIdleTimeMillis: 900000
# 配置检测连接是否有效
validationQuery: SELECT 1 #SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
webStatFilter:
enabled: true
statViewServlet:
enabled: true
# 设置白名单,不填则允许所有访问
allow:
url-pattern: /druid/*
# 控制台管理用户名和密码
login-username: admin
login-password: 123456
filter:
stat:
enabled: true
# 慢SQL记录
log-slow-sql: true
slow-sql-millis: 1000
merge-sql: true
wall:
config:
multi-statement-allow: true
Dynamische Datenquellenkonfiguration:
package com.ceekee.hotel.config;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.sql.DataSource;
import com.ceekee.hotel.config.properties.DruidProperties;
import com.ceekee.hotel.datasource.DynamicDataSource;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.alibaba.druid.spring.boot.autoconfigure.properties.DruidStatProperties;
import com.alibaba.druid.util.Utils;
import com.ceekee.hotel.enums.DataSourceType;
import com.ceekee.hotel.utils.spring.SpringUtils;
/**
* druid 配置多数据源
*
* @author zhangming
*/
@Configuration
public class DruidConfig {
@Bean
@ConfigurationProperties("spring.datasource.druid.master")
public DataSource masterDataSource(DruidProperties druidProperties)
{
DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
return druidProperties.dataSource(dataSource);
}
@Bean
@ConfigurationProperties("spring.datasource.druid.slave")
@ConditionalOnProperty(prefix = "spring.datasource.druid.slave", name = "enabled", havingValue = "true")
public DataSource slaveDataSource(DruidProperties druidProperties) {
DruidDataSource dataSource = DruidDataSourceBuilder.create().build();
//!!! druid 检查sql 有效性
// 不加报错:com.microsoft.sqlserver.jdbc.SQLServerException: Invalid object name 'DUAL'.
dataSource.setValidationQuery("SELECT 1");
return druidProperties.dataSource(dataSource);
}
@Bean(name = "dynamicDataSource")
@Primary
public DynamicDataSource dataSource(DataSource masterDataSource)
{
Map<Object, Object> targetDataSources = new HashMap<>();
targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
setDataSource(targetDataSources, DataSourceType.SLAVE.name(), "slaveDataSource");
return new DynamicDataSource(masterDataSource, targetDataSources);
}
/**
* 设置数据源
*
* @param targetDataSources 备选数据源集合
* @param sourceName 数据源名称
* @param beanName bean名称
*/
public void setDataSource(Map<Object, Object> targetDataSources, String sourceName, String beanName)
{
try
{
DataSource dataSource = SpringUtils.getBean(beanName);
targetDataSources.put(sourceName, dataSource);
}
catch (Exception e)
{
}
}
/**
* 去除监控页面底部的广告
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
@Bean
@ConditionalOnProperty(name = "spring.datasource.druid.statViewServlet.enabled", havingValue = "true")
public FilterRegistrationBean removeDruidFilterRegistrationBean(DruidStatProperties properties)
{
// 获取web监控页面的参数
DruidStatProperties.StatViewServlet config = properties.getStatViewServlet();
// 提取common.js的配置路径
String pattern = config.getUrlPattern() != null ? config.getUrlPattern() : "/druid/*";
String commonJsPattern = pattern.replaceAll("\\*", "js/common.js");
final String filePath = "support/http/resources/js/common.js";
// 创建filter进行过滤
Filter filter = new Filter()
{
@Override
public void init(javax.servlet.FilterConfig filterConfig) throws ServletException
{
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException
{
chain.doFilter(request, response);
// 重置缓冲区,响应头不会被重置
response.resetBuffer();
// 获取common.js
String text = Utils.readFromResource(filePath);
// 正则替换banner, 除去底部的广告信息
text = text.replaceAll("<a.*?banner\"></a><br/>", "");
text = text.replaceAll("powered.*?shrek.wang</a>", "");
response.getWriter().write(text);
}
@Override
public void destroy()
{
}
};
FilterRegistrationBean registrationBean = new FilterRegistrationBean();
registrationBean.setFilter(filter);
registrationBean.addUrlPatterns(commonJsPattern);
return registrationBean;
}
}