从SQL查询获取表名

Question

I am using golang SQL parser to fetch query related information from actual SQL query string. I am able to find the type of query using following code:

queryType := sqlparser.StmtType(sqlparser.Preview(sql))
fmt.Println(queryType)

but i am not sure how to get actual table names from sql query. The documentation is not clear as well. Only information i get from parse function is a statement

Can someone guide me how can get this information using golang sqlparser?

Answer 1

To get all the table names, you will have to pull them out from the Statement returned by Parse, possibly using reflection. If you run the following code:

stmt, _ := sqlparser.Parse("insert into my_table set my_column=1")
fmt.Printf("%#v
", stmt)

you get the output (indented for readability):

&sqlparser.Insert{
    Action:"insert", 
    Comments:sqlparser.Comments(nil), 
    Ignore:"", 
    Table:sqlparser.TableName{
        Name:sqlparser.TableIdent{v:"my_table"}, 
        Qualifier:sqlparser.TableIdent{v:""}
    }, 
    Partitions:sqlparser.Partitions(nil), 
    Columns:sqlparser.Columns{sqlparser.ColIdent{_:[0]struct { _ []uint8 }{}, val:"my_column", lowered:""}}, 
    Rows:sqlparser.Values{sqlparser.ValTuple{(*sqlparser.SQLVal)(0xc00000a0c0)}}, 
    OnDup:sqlparser.OnDup(nil)
}

as you can see, this contains a (sub)field of type TableIdent which contains the requested table from the statement.