Struct ColumnInfo

pub struct ColumnInfo { /* private fields */ }

Column information in a select statement

Examples

Print column information of emp table.

let conn = Connection::connect("scott", "tiger", "")?;
let mut stmt = conn.statement("select * from emp").build()?;
let rows = stmt.query(&[])?;
println!(" {:-30} {:-8} {}", "Name", "Null?", "Type");
println!(" {:-30} {:-8} {}", "------------------------------", "--------", "----------------------------");
for info in rows.column_info() {
   println!("{:-30} {:-8} {}",
            info.name(),
            if info.nullable() {""} else {"NOT NULL"},
            info.oracle_type());
}

The output is:

 Name                           Null?    Type
 ------------------------------ -------- ----------------------------
 EMPNO                          NOT NULL NUMBER(4)
 ENAME                                   VARCHAR2(10)
 JOB                                     VARCHAR2(9)
 MGR                                     NUMBER(4)
 HIREDATE                                DATE
 SAL                                     NUMBER(7,2)
 COMM                                    NUMBER(7,2)
 DEPTNO                                  NUMBER(2)

Implementations

impl ColumnInfo

pub fn name(&self) -> &str

Gets column name

pub fn oracle_type(&self) -> &OracleType

Gets Oracle type

pub fn nullable(&self) -> bool

Gets whether the column may be NULL. False when the column is defined as NOT NULL.

Trait Implementations

impl Clone for ColumnInfo

fn clone(&self) -> ColumnInfo

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ColumnInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for ColumnInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.