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mongo_database.go
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mongo_database.go
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package dorm
import (
"context"
"go.mongodb.org/mongo-driver/mongo"
"go.mongodb.org/mongo-driver/mongo/options"
"reflect"
)
type MongoDatabaseOptions struct {
db *mongo.Client // 驱动
configDatabaseName string // 库名
dbDatabase *mongo.Database // 数据库
}
// Database 选择数据库
func (c *MongoClient) Database(name string, opts ...*options.DatabaseOptions) *MongoDatabaseOptions {
return &MongoDatabaseOptions{
db: c.db, // 驱动
configDatabaseName: c.configDatabaseName, // 库名
dbDatabase: c.db.Database(name, opts...), // 数据库
}
}
// CreateCollection 创建集合
func (cd *MongoDatabaseOptions) CreateCollection(ctx context.Context, name string, opts ...*options.CreateCollectionOptions) error {
return cd.dbDatabase.CreateCollection(ctx, name, opts...)
}
// CreateTimeSeriesCollection 创建时间序列集合
func (cd *MongoDatabaseOptions) CreateTimeSeriesCollection(ctx context.Context, name string, timeField string) error {
return cd.dbDatabase.CreateCollection(ctx, name, options.CreateCollection().SetTimeSeriesOptions(options.TimeSeries().SetTimeField(timeField)))
}
// Model 传入模型自动获取库名和表名
// https://studygolang.com/articles/896
// DatabaseName 库名
// CollectionName 集合名
func (c *MongoClient) Model(value interface{}) *MongoCollectionOptions {
var databaseOptions *MongoDatabaseOptions
var collectionOptions *MongoCollectionOptions
val := reflect.ValueOf(value)
methodDatabaseNameValue := val.MethodByName("DatabaseName")
if methodDatabaseNameValue.IsValid() {
databaseName := methodDatabaseNameValue.Call(nil)[0].String()
databaseOptions = c.Database(databaseName)
} else {
databaseOptions = c.Database(c.configDatabaseName)
}
methodCollectionNameValue := val.MethodByName("CollectionName")
if methodCollectionNameValue.IsValid() {
collectionName := methodCollectionNameValue.Call(nil)[0].String()
collectionOptions = databaseOptions.Collection(collectionName)
} else {
methodTableNameValue := val.MethodByName("TableName")
if methodTableNameValue.IsValid() {
collectionName := methodTableNameValue.Call(nil)[0].String()
collectionOptions = databaseOptions.Collection(collectionName)
} else {
panic(NoConfigCollectionName)
}
}
return collectionOptions
}