希望将标准 SQL 列与文档一起存储的应用程序可以将集合转换为表。在这种情况下，可以使用 Schema.getCollectionAsTable() 函数将集合获取为表对象。从那一刻起，它就被视为常规表。可以使用以下语法在 SQL CRUD 操作中访问文档值

doc->'$.field'

doc->'$.field' 用于访问文档顶级字段。也可以指定更复杂的路径。

doc->'$.some.field.like[3].this'

使用 Schema.getCollectionAsTable() 函数将集合获取为表后，可以使用所有 SQL CRUD 操作。使用文档访问语法，您可以从集合的文档和额外的 SQL 列中选择数据。

以下示例演示如何将 JSON 文档字符串插入 doc 字段。

MySQL Shell JavaScript 代码

// Get the customers collection as a table
var customers = db.getCollectionAsTable('customers');
customers.insert('doc').values('{"_id":"001", "name": "Ana", "last_name": "Silva"}').execute();

// Now do a find operation to retrieve the inserted document
var result = customers.select(["doc->'$.name'", "doc->'$.last_name'"]).where("doc->'$._id' = '001'").execute();

var record = result.fetchOne();

print ("Name : "  + record[0]);
print ("Last Name : "  + record[1]);

MySQL Shell Python 代码

# Get the customers collection as a table
customers = db.get_collection_as_table('customers')
customers.insert('doc').values('{"_id":"001", "name": "Ana", "last_name": "Silva"}').execute()

# Now do a find operation to retrieve the inserted document
result = customers.select(["doc->'$.name'", "doc->'$.last_name'"]).where("doc->'$._id' = '001'").execute()

record = result.fetch_one()

print("Name : %s\n"  % record[0])
print("Last Name : %s\n"  % record[1])

Node.js JavaScript 代码

// Get the customers collection as a table
var customers = db.getCollectionAsTable('customers');
customers.insert('doc').values('{"_id":"001", "name": "Ana"}').execute();

C# 代码

// Get the customers collection as a table
var customers = db.GetCollectionAsTable("customers");
customers.Insert("doc").Values("{ \"_id\": 1, \"name\": \"Ana\" }").Execute();

Python 代码

# Get the customers collection as a table
customers = db.get_collection_as_table("customers")
customers.insert('doc').values({'_id':'001', 'name': 'Ana', 'last_name': 'Silva'}).execute()

# Now do a find operation to retrieve the inserted document
result = customers.select(["doc->'$.name'", "doc->'$.last_name'"]).where("doc->'$._id' = '001'").execute()

record = result.fetch_one()

print('Name : {0}'.format(record[0]))
print('Last Name : {0}'.format(record[1]))

Java 代码

// Get the customers collection as a table
Table customers = db.getCollectionAsTable("customers");
customers.insert("doc").values("{\"name\": \"Ana\"}").execute();

C++ 代码

// Get the customers collection as a table
Table customers = db.getCollectionAsTable("customers");
customers.insert("doc")
         .values(R"({"_id":"001", "name": "Ana", "last_name": "Silva"})").execute();

// Now do a find operation to retrieve the inserted document
RowResult result = customers.select("doc->'$.name'", "doc->'$.last_name'")
                            .where("doc->'$._id' = '001'").execute();

Row record = result.fetchOne();
cout << "Name : " << record[0] << endl;
cout << "Last Name : " << record[1] << endl;