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2026-06-18

读取列名称 - GetColumnName ​

函数简介 ​

读取查询结果集中指定列的名称，返回列名的字符串指针。

接口名称 ​

GetColumnName

DLL调用 ​

c
long GetColumnName(long ola, long stmt, int columnIndex);

参数说明 ​

参数名类型说明
ola长整数型OLAPlug对象的指针，由 CreateCOLAPlugInterFace 接口生成。
stmt长整数型数据库语句对象指针，由 ExecuteReader 接口返回。
columnIndex整数型列索引，从0开始。

示例 ​

SDK 调用 ​

cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
long db = ola.OpenDatabase("data/app.db", "");
if (db != 0) {
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0) {
        std::string colName = ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt);
    }
    ola.CloseDatabase(db);
}
csharp
using OLAPlug;

var ola = new OLAPlugServer();
long db = ola.OpenDatabase("data/app.db", "");
if (db != 0)
{
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0)
    {
        string colName = ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt);
    }
    ola.CloseDatabase(db);
}
python
from OLAPlugServer import OLAPlugServer

ola = OLAPlugServer()
db = ola.OpenDatabase("data/app.db", "")
if db != 0:
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)")
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)")
    stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1")
    if stmt != 0:
        col_name = ola.GetColumnName(stmt, 0)
        ola.Finalize(stmt)
    ola.CloseDatabase(db)
java
import com.olaplug.OLAPlugServer;

OLAPlugServer ola = new OLAPlugServer();
long db = ola.OpenDatabase("data/app.db", "");
if (db != 0) {
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0) {
        ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt);
    }
    ola.CloseDatabase(db);
}
cpp
var ola = com("OlaPlug.OlaSoft")
var db = ola.OpenDatabase("data/app.db", "")
if(db) {
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)")
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)")
    var stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1")
    if(stmt) {
        ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt)
    }
    ola.CloseDatabase(db)
}
vbscript
Set ola = CreateObject("OlaPlug.OlaSoft")
db = ola.OpenDatabase("data/app.db", "")
If db <> 0 Then
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)")
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)")
    stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1")
    If stmt <> 0 Then
        ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt)
    End If
    ola.CloseDatabase(db)
End If
text
.局部变量 ola, OLAPlug
ola.创建 ()
db ＝ ola.OpenDatabase (“data/app.db“, ““)
.如果真 (db ≠ 0)
    ola.ExecuteSql (db, “CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)“)
    ola.ExecuteSql (db, “INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)“)
    stmt ＝ ola.ExecuteReader (db, “SELECT id, name, score FROM users WHERE id=1“)
    .如果真 (stmt ≠ 0)
        ola.GetColumnName(stmt, 0);
        ola.Finalize (stmt)
    .如果真结束
    ola.CloseDatabase (db)
.如果真结束
aardio
import OLAPlugServer;
var ola = OLAPlugServer();
var db = ola.OpenDatabase("data/app.db", "");
if(db){
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    var stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1");
    if(stmt){
        ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt);
    }
    ola.CloseDatabase(db);
}
text
变量 ola <类型 = OLAPlugServer>
ola = 新建 OLAPlugServer
长整数 db = ola.OpenDatabase("data/app.db", "")
如果真 (db ≠ 0)
{
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)")
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)")
    长整数 stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1")
    如果真 (stmt ≠ 0)
    {
        ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt)
    }
    ola.CloseDatabase(db)
}
cpp
#include "OLAPlugServer.h"

OLAPlugServer ola;
long db = ola.OpenDatabase("data/app.db", "");
if (db != 0) {
    ola.ExecuteSql(db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ola.ExecuteSql(db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ola.ExecuteReader(db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0) {
        ola.GetColumnName(stmt, 0);
        ola.Finalize(stmt);
    }
    ola.CloseDatabase(db);
}

原生 DLL 调用 ​

cpp
long instance = CreateCOLAPlugInterFace();
long db = OpenDatabase(instance, "data/app.db", "");
if (db != 0) {
    ExecuteSql(instance, db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ExecuteSql(instance, db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ExecuteReader(instance, db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0) {
        std::string colName = ola.GetColumnName(stmt, 0);
        Finalize(instance, stmt);
    }
    CloseDatabase(instance, db);
}
csharp
using System.Runtime.InteropServices;

[DllImport("OLAPlug_x64.dll", CallingConvention = CallingConvention.StdCall)]
static extern long CreateCOLAPlugInterFace();

long instance = CreateCOLAPlugInterFace();
long db = OpenDatabase(instance, "data/app.db", "");
if (db != 0)
{
    ExecuteSql(instance, db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ExecuteSql(instance, db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ExecuteReader(instance, db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0) {
        string colName = ola.GetColumnName(stmt, 0);
        Finalize(instance, stmt);
    }
    CloseDatabase(instance, db);
}
python
from ctypes import CDLL, c_int, c_int64

ola = CDLL("OLAPlug_x64.dll")
ola.CreateCOLAPlugInterFace.restype = c_int64
instance = ola.CreateCOLAPlugInterFace()
db = ola.OpenDatabase(instance, b"data/app.db", b"")
if db:
    ExecuteSql(instance, db, "CREATE TABLE IF NOT EXISTS users(id INTEGER PRIMARY KEY, name TEXT, score REAL)");
    ExecuteSql(instance, db, "INSERT OR REPLACE INTO users VALUES(1,'ola',98.5)");
    long stmt = ExecuteReader(instance, db, "SELECT id, name, score FROM users WHERE id=1");
    if (stmt != 0) {
        col_name = ola.GetColumnName(stmt, 0)
        Finalize(instance, stmt);
    }
    ola.CloseDatabase(instance, db)

返回值 ​

返回值说明
（返回值）列名的字符串指针。如果操作失败，返回 0。使用完毕后需调用 FreeStringPtr 释放内存。

注意事项 ​

项目说明
配合使用通常与 ExecuteReader 和 GetColumnCount 配合使用。
如果列索引无效或操作失败如果列索引无效或操作失败，函数将返回 0。