在JavaScript数组中获取MongoDB数据库？
要在JavaScript数组中获取MongoDB数据库，可以使用runCommand()。以下是查询以JavaScript数组获取MongoDB数据库的查询
> use admin;
switched to db admin
> allDatabasesDetails = db.runCommand({listDatabases: 1});这将产生以下输出
{
"databases" : [
{
"name" : "admin",
"sizeOnDisk" : 847872,
"empty" : false
},
{
"name" : "config",
"sizeOnDisk" : 98304,
"empty" : false
},
{
"name" : "local",
"sizeOnDisk" : 73728,
"empty" : false
},
{
"name" : "sample",
"sizeOnDisk" : 1273856,
"empty" : false
},
{
"name" : "sampleDemo",
"sizeOnDisk" : 352256,
"empty" : false
},
{
"name" : "studentSearch",
"sizeOnDisk" : 262144,
"empty" : false
},
{
"name" : "test",
"sizeOnDisk" : 9527296,
"empty" : false
}
],
"totalSize" : 12435456,
"ok" : 1
}以下是获取数据库总数的查询：
> allDatabaseName = []
[ ]
> for (var j in allDatabasesDetails.databases) { allDatabaseName.push(dbs.databases[j].name) }这将产生以下输出
7