SpringBoot - com.microsoft.sqlserver.jdbc.SQLServerException: O nome do objeto ‘DUAL’ é inválido | Fonte de dados dupla druida MySQL + SQL ser

Ao usar fontes de dados duplas MySQL e SQLserver no projeto SpringBoot, um erro é relatado ao executar

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

Procuramos esse DUAL globalmente em nosso próprio código e usamos essa instrução apenas no Druid para verificar as informações de conexão do banco de dados.

O motivo do erro:druid Verifique a validade do sql e adicione a seguinte configuração ao arquivo application.prppertis

# 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

Pode ser usado normalmente no MySQL e retorna 1. MySQL possui o objeto DUAL.

Porém, o servidor SQL não possui o objeto DUAL, o que significa que esta instrução não pode ser executada no servidor SQL, portanto um erro é relatado.

Solução

Mudar para

validationQuery: SELECT 1

Importar pacote de driver salserver

<!-- SqlServer驱动包 -->
        <dependency>
            <groupId>com.microsoft.sqlserver</groupId>
            <artifactId>sqljdbc4</artifactId>
            <version>4.0</version>
        </dependency>

A configuração completa do yml é a seguinte:

# 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

Configuração dinâmica da fonte de dados:

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;
    }
}

SpringBoot - com.microsoft.sqlserver.jdbc.SQLServerException: O nome do objeto ‘DUAL’ é inválido | Fonte de dados dupla druida MySQL + SQL ser

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