springboot引入druid解析sql

一、前言

在开发中，有时我们可能会需要获取SQL中的表名，那么因为不同的数据源类型SQL会存在部分差异，那么我们就可以使用alibaba 的druid包实现不同的数据源类型的sql解析。

二、引入相关maven依赖

csharp 复制代码

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.8</version>
        </dependency>

三、通过工具类SqlUtils实现对SQL的解析。

csharp 复制代码

public class QualitySqlUtils {

	  /**
     *  根据sql及数据源类型获取表名
     */
	 public static List<String> getSelectSqlTable(String sql, String dbType) {
        List<String> tableList = new ArrayList<>();
        List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, dbType);
        SchemaStatVisitor visitor;
        for (SQLStatement sqlStatement : stmtList) {
            if (DbType.mysql.name().equalsIgnoreCase(dbType)) {
                visitor = new MySqlSchemaStatVisitor();
            } else if (DbType.hive.name().equalsIgnoreCase(dbType)) {
                visitor = new HiveSchemaStatVisitor();
            } else if (DbType.postgresql.name().equalsIgnoreCase(dbType)) {
                visitor = new PGSchemaStatVisitor();
            } else if (DbType.oracle.name().equalsIgnoreCase(dbType)) {
                visitor = new OracleSchemaStatVisitor();
            } else {
                visitor = new SchemaStatVisitor(DbType.of(dbType));
            }
            sqlStatement.accept(visitor);
            Map<TableStat.Name, TableStat> tables = visitor.getTables();
            for (Map.Entry<TableStat.Name, TableStat> entry: tables.entrySet()){
                String value = entry.getValue().toString();
                if (StringUtils.isNotBlank(value)) {
                    tableList.add(entry.getKey().getName());
                }
            }
        }
        return tableList;
    }
    /**
    * 根据sql获取查询的字段
    */
    public static Map<String, String> getSelectSqlColumn(String sql, String dbType) {
        Map<String, String> columnMap = new HashMap<>();
        List<SQLStatement> stmtList = SQLUtils.parseStatements(sql, dbType);
        for (int i = 0; i < stmtList.size(); i++) {
            SQLStatement stmt = stmtList.get(i);
            if (stmt instanceof SQLSelectStatement) {
                SQLSelectStatement sqlSelectStatement = (SQLSelectStatement) stmt;
                SQLSelect select = sqlSelectStatement.getSelect();
                SQLSelectQueryBlock query = (SQLSelectQueryBlock) select.getQuery();
                List<SQLSelectItem> selectList = query.getSelectList();
                selectList.forEach(item->{
                    columnMap.put(item.getExpr().toString(), item.getAlias());
                });
            }
        }
        return columnMap;
    }
}

三、测试结果

csharp 复制代码

public class testDemo{
	
    public static void main(String[] args) {
        String sql = "select t.* from table1 as t left join table2 t2 on t.id = t2.id";
        List<String> tableList =getSelectSqlTable(sql, "mysql");
        System.out.println("获取到的表名: "+tableList);
    }
}

运行结果如下：

大家感兴趣可以尝试下。