Struct oracle::ColumnInfo
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pub struct ColumnInfo { /* fields omitted */ }
Column information in a select statement
Examples
Print column information of emp
table.
let conn = oracle::Connection::new("scott", "tiger", "").unwrap(); let mut stmt = conn.execute("select * from emp", &[]).unwrap(); println!(" {:-30} {:-8} {}", "Name", "Null?", "Type"); println!(" {:-30} {:-8} {}", "------------------------------", "--------", "----------------------------"); for info in stmt.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)
Methods
impl ColumnInfo
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fn name(&self) -> &String
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Gets column name
fn oracle_type(&self) -> &OracleType
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Gets Oracle type
fn nullable(&self) -> bool
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Gets whether the column may be NULL.
False when the column is defined as NOT NULL
.
Trait Implementations
impl Clone for ColumnInfo
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fn clone(&self) -> ColumnInfo
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more