SQLite第五课 应用案例

1 打开数据库文件

sqlite3* m_db = NULL;

int ret = sqlite3_open_v2("test.db",&db,SQLITE_OPEN_READWRITE,NULL);

if (ret != SQLITE_OK)

{

return;

}

2 如果表不存在，创建表

char szCreateUserDataSql[1024] = "create table if not exists tb_user (id INTEGER,

type INTEGER,255);"> kind INTEGER)";

3 创建唯一的主键ID

char szCreateUserDataSql[1024] = "create table if not exists tb_user (id INTEGER PRIMARY KEY AUTOINCREMENT,255);">4 查询

char szSql[1024] = {0};

sprintf(szSql,"select distinct * from tb_test");

sqlite3_stmt* stmt = NULL;

sqlite3_prepare(m_db,szSql,-1,&stmt,0);

while (sqlite3_step(stmt) == SQLITE_ROW)

const unsigned char* szPOIName = sqlite3_column_text(stmt,255);"> char szName[128] = {0};

if (szPOIName)

{

sprintf(szName,"%s",szPOIName);

}

int kx = sqlite3_column_int(stmt,3);

float x = sqlite3_column_double(stmt,5);

sqlite3_finalize(stmt);

5 获取sql执行失败的错误信息

char* errMsg = NULL;

char* szSql = "select * from address";

nRet = sqlite3_exec(pDB,NULL,&errMsg);

if (nRet != SQLITE_OK)

{

cout<<errMsg<<endl;

sqlite3_free(errMsg);

}

注意：释放errMsg指向的内存

6 关闭数据库

sqlite3_close(db);

（编辑：李大同）

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