feat: find_in_set函数的跨数据库实现

yudao-framework/yudao-spring-boot-starter-mybatis/src/main/java/cn/iocoder/yudao/framework/mybatis/core/enums/FindInSetEnum.java

@@ -0,0 +1,50 @@
+package cn.iocoder.yudao.framework.mybatis.core.enums;
+
+
+import com.baomidou.mybatisplus.annotation.DbType;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+import java.util.Arrays;
+import java.util.Map;
+import java.util.Optional;
+import java.util.stream.Collectors;
+
+/**
+ * find_in_set函数的跨数据库实现
+ *
+ * @author dhb52
+ */
+@Getter
+@AllArgsConstructor
+public enum FindInSetEnum {
+
+    // FIND_IN_SET: MySQL 类型
+    MYSQL("FIND_IN_SET('#{value}', #{column}) <> 0", DbType.MYSQL),
+    DM("FIND_IN_SET('#{value}', #{column}) <> 0", DbType.DM),
+
+    // INSTR: Oracle 类型
+    ORACLE("INSTR(','||#{column}||',' , ',#{value},') <> 0", DbType.ORACLE),
+
+    // CHARINDEX: SQLServer
+    SQLSERVER("CHARINDEX(',' + #{value} + ',', ',' + #{column} + ',')", DbType.SQL_SERVER),
+
+    // POSITION: PostgreSQL 类型
+    POSTGRE_SQL("POSITION('#{value}' IN #{column})", DbType.POSTGRE_SQL),
+    KINGBASE_ES("POSITION('#{value}' IN #{column})", DbType.KINGBASE_ES),
+
+    // LOCATE: 其他
+    H2("LOCATE('#{value}' IN #{column})", DbType.H2),
+    ;
+
+    public static final Map<DbType, String> MAPS = Arrays.stream(values())
+            .collect(Collectors.toMap(FindInSetEnum::getDbType, FindInSetEnum::getSqlTemplate));
+
+    private String sqlTemplate;
+    private DbType dbType;
+
+    public static String getTemplate(DbType dbType) {
+        return Optional.of(MAPS.get(dbType))
+                .orElseThrow(() -> new IllegalArgumentException("FIND_IN_SET not supported"));
+    }
+}

yudao-framework/yudao-spring-boot-starter-mybatis/src/main/java/cn/iocoder/yudao/framework/mybatis/core/enums/NameToTypeEnum.java

@@ -0,0 +1,66 @@
+package cn.iocoder.yudao.framework.mybatis.core.enums;
+
+import cn.hutool.core.util.StrUtil;
+import com.baomidou.mybatisplus.annotation.DbType;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+import java.util.Arrays;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+ * 数据库产品名 => mp DbType 的映射关系
+ *
+ * @author dhb52
+ */
+@Getter
+@AllArgsConstructor
+public enum NameToTypeEnum {
+
+    /**
+     * MySQL
+     */
+    MY_SQL("MySQL", DbType.MYSQL),
+
+    /**
+     * Oracle
+     */
+    ORACLE("Oracle", DbType.ORACLE),
+
+    /**
+     * PostgreSQL
+     */
+    POSTGRE_SQL("PostgreSQL", DbType.POSTGRE_SQL),
+
+    /**
+     * SQL Server
+     */
+    SQL_SERVER("Microsoft SQL Server", DbType.SQL_SERVER),
+
+    /**
+     * 达梦
+     */
+    DM("DM DBMS", DbType.DM),
+
+    /**
+     * 人大金仓
+     */
+    KINGBASE_ES("KingbaseES", DbType.KINGBASE_ES),
+
+    // 华为openGauss ProductName 与 PostgreSQL相同
+    ;
+
+    private final String name;
+    private final DbType type;
+
+    public static final Map<String, DbType> MAPS = Arrays.stream(values())
+            .collect(Collectors.toMap(NameToTypeEnum::getName, NameToTypeEnum::getType));
+
+    public static DbType find(String databaseProductName) {
+        if (StrUtil.isBlank(databaseProductName)) {
+            return null;
+        }
+        return MAPS.get(databaseProductName);
+    }
+}

yudao-framework/yudao-spring-boot-starter-mybatis/src/main/java/cn/iocoder/yudao/framework/mybatis/core/util/JdbcUtils.java

@@ -1,9 +1,15 @@
 package cn.iocoder.yudao.framework.mybatis.core.util;
 
+import cn.iocoder.yudao.framework.common.util.spring.SpringUtils;
+import cn.iocoder.yudao.framework.mybatis.core.enums.NameToTypeEnum;
+import com.baomidou.dynamic.datasource.DynamicRoutingDataSource;
 import com.baomidou.mybatisplus.annotation.DbType;
 
+import javax.sql.DataSource;
 import java.sql.Connection;
+import java.sql.DatabaseMetaData;
 import java.sql.DriverManager;
+import java.sql.SQLException;
 
 /**
  * JDBC 工具类
@@ -38,4 +44,22 @@ public class JdbcUtils {
         return com.baomidou.mybatisplus.extension.toolkit.JdbcUtils.getDbType(url);
     }
 
+    /**
+     * 通过当前数据库连接获得对应的 DB 类型
+     *
+     * @return DB 类型
+     */
+    public static DbType getDbType() {
+        DynamicRoutingDataSource dynamicRoutingDataSource = SpringUtils.getBean(DynamicRoutingDataSource.class);
+        DataSource dataSource = dynamicRoutingDataSource.determineDataSource();
+        try (Connection conn = dataSource.getConnection()) {
+            DatabaseMetaData metaData = conn.getMetaData();
+            String databaseProductName = metaData.getDatabaseProductName();
+            DbType dbType = NameToTypeEnum.find(databaseProductName);
+            return dbType;
+        } catch (SQLException e) {
+            throw new IllegalArgumentException(e.getMessage());
+        }
+    }
+
 }

yudao-framework/yudao-spring-boot-starter-mybatis/src/main/java/cn/iocoder/yudao/framework/mybatis/core/util/MyBatisUtils.java

@@ -1,8 +1,11 @@
 package cn.iocoder.yudao.framework.mybatis.core.util;
 
 import cn.hutool.core.collection.CollectionUtil;
+import cn.hutool.core.util.StrUtil;
 import cn.iocoder.yudao.framework.common.pojo.PageParam;
 import cn.iocoder.yudao.framework.common.pojo.SortingField;
+import cn.iocoder.yudao.framework.mybatis.core.enums.FindInSetEnum;
+import com.baomidou.mybatisplus.annotation.DbType;
 import com.baomidou.mybatisplus.core.metadata.OrderItem;
 import com.baomidou.mybatisplus.core.toolkit.StringPool;
 import com.baomidou.mybatisplus.extension.plugins.MybatisPlusInterceptor;
@@ -56,7 +59,7 @@ public class MyBatisUtils {
 
     /**
      * 获得 Table 对应的表名
-     *
+     * <p>
      * 兼容 MySQL 转义表名 `t_xxx`
      *
      * @param table 表
@@ -85,4 +88,18 @@ public class MyBatisUtils {
         return new Column(tableName + StringPool.DOT + column);
     }
 
+    /**
+     * 跨数据库的 find_in_set 实现
+     *
+     * @param column 字段名称
+     * @param value  查询值(不带单引号)
+     * @return sql
+     */
+    public static String findInSet(String column, Object value) {
+        // 这里不用SqlConstants.DB_TYPE，因为它是使用 primary 数据源的 url 推断出来的类型
+        DbType dbType = JdbcUtils.getDbType();
+        return FindInSetEnum.getTemplate(dbType)
+                .replace("#{column}", column)
+                .replace("#{value}", StrUtil.toString(value));
+    }
 }