前面说到的 sqlite_exec() 中的第三个参数， SQLite 将为 sql 参数内执行的每个 SELECT 语句中处理的每个记录调用这个回调函数。

本节添加了两个函数，selectFromTable和updateTable.

实例程序如下：

#include <stdio.h>
#include <stdlib.h>
#include "sqlite/sqlite3.h"

#define DB_NANE "sqlite/test.db"

sqlite3 *db = NULL;
char* sql = NULL;
char *zErrMsg = NULL;
const char* data = http://www.mamicode.com/"Callback function called";/* 改为全局的 */>
bool selectFromTable()/*新加*/
{
    /* Create SQL statement */
    sql = "SELECT * from COMPANY";
    
    /* Execute SQL statement */
    ret = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
    if( ret != SQLITE_OK ){
        fprintf(stderr, "Error SQL: %s\n", zErrMsg);
        sqlite3_free(zErrMsg);
        return false;
    }
    
    fprintf(stdout, "successfully operation done\n");
    
    return true;
}
bool updateTable()/* 新加 */
{
    /* Create merged SQL statement */
    sql = "UPDATE COMPANY set SALARY = 25000.00 where ID=1; "     "SELECT * from COMPANY";
    
    /* Execute SQL statement */
    ret = sqlite3_exec(db, sql, callback, (void*)data, &zErrMsg);
    if( ret != SQLITE_OK ){
        fprintf(stderr, "SQL error: %s\n", zErrMsg);
        sqlite3_free(zErrMsg);
        
        return false;
    }
    
    fprintf(stdout, "Successfully operation done \n");
    
    return true;
}


bool closeDB()
{
    int ret = 0;
    ret = sqlite3_close(db);
    if ( ret == SQLITE_BUSY ){
        return false;
    }
    
    return true;
}

int main(int argc, char* argv[])
{
    connectDB();
    /*createTable();*/
    /*insertRecords();*/
    selectFromTable();
    updateTable();
    selectFromTable();
    closeDB();
    
    return 0;
}