前面說(shuō)到的 sqlite_exec() 中的第三個(gè)參數(shù)， SQLite 將為 sql 參數(shù)內(nèi)執(zhí)行的每個(gè) SELECT 語(yǔ)句中處理的每個(gè)記錄調(diào)用這個(gè)回調(diào)函數(shù)。

本節(jié)添加了兩個(gè)函數(shù)，selectFromTable和updateTable.

實(shí)例程序如下：

#include

#include

#include "sqlite/sqlite3.h"

#define DB_NANE "sqlite/test.db"

sqlite3 *db = NULL;

char* sql = NULL;

char *zErrMsg = NULL;

const char* data = "Callback function called";/* 改為全局的 */

int ret = 0;

typedef enum{

false,

true

} bool;

/*

typedef int (*sqlite3_callback)(

void*, Data provided in the 4th argument of sqlite3_exec()

int, The number of columns in row

char**, An array of strings representing fields in the row

char** An array of strings representing column names

);

*/

static int callback(void *NotUsed, int argc, char **argv, char **azColName)

{

int i = 0;

for(i=0; i < argc; i++){

printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");

}

printf("\n");

return 0;

}

bool connectDB()

{

ret = sqlite3_open(DB_NANE, &db);

if( ret != SQLITE_OK){

fprintf(stderr, "Error open database: %s\n", sqlite3_errmsg(db));

sqlite3_free(zErrMsg);

return false;

}

fprintf(stdout, "Successfully opened database\n");

return true;

}

bool createTable()

{

/* Create SQL statement */

sql = "CREATE TABLE COMPANY(" "ID INT PRIMARY KEY NOT NULL," "NAME TEXT NOT NULL," "AGE INT NOT NULL," "ADDRESS CHAR(50)," "SALARY REAL );";

/* Execute SQL statement */

ret = sqlite3_exec(db, sql, callback, 0, &zErrMsg);

if( ret != SQLITE_OK ){

fprintf(stderr, "Error SQL: %s\n", zErrMsg);

sqlite3_free(zErrMsg);

return false;

}

fprintf(stdout, "Successfully table created\n");

return true;

}

bool insertRecords()

{

/* Create SQL statement */

sql = "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " "VALUES (1, 'Paul', 32, 'California', 20000.00 ); " "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY) " "VALUES (2, 'Allen', 25, 'Texas', 15000.00 ); " "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" "VALUES (3, 'Teddy', 23, 'Norway', 20000.00 );" "INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY)" "VALUES (4, 'Mark', 25, 'Rich-Mond ', 65000.00 );";

/* Execute SQL statement */

ret = sqlite3_exec(db, sql, callback, 0, &zErrMsg);

if( ret != SQLITE_OK ){

fprintf(stderr, "SQL error: %s\n", zErrMsg);

sqlite3_free(zErrMsg);

return false;

}

fprintf(stdout, "successfully records created\n");

return true;

}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;

}

原文：http://blog.csdn.net/xufeng0991/article/details/38598313

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