sqlite3创建表详解

以下是使用C语言实现sqlite3创建表格的步骤和代码示例：

1. 打开数据库连接

sqlite3 *db;
int rc = sqlite3_open("test.db", &db);
if (rc != SQLITE_OK) {
    fprintf(stderr, "Cannot open database: %s\n", sqlite3_errmsg(db));
    sqlite3_close(db);
    return 1;
}

2. 执行SQL语句创建表格

char *sql = "CREATE TABLE COMPANY("
            "ID INT PRIMARY KEY     NOT NULL,"
            "NAME           TEXT    NOT NULL,"
            "AGE            INT     NOT NULL,"
            "ADDRESS        CHAR(50),"
            "SALARY         REAL );";
char *errmsg;
rc = sqlite3_exec(db, sql, NULL, 0, &errmsg);
if (rc != SQLITE_OK) {
    fprintf(stderr, "SQL error: %s\n", errmsg);
    sqlite3_free(errmsg);
    sqlite3_close(db);
    return 1;
}

3. 插入数据

char *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 );";
rc = sqlite3_exec(db, sql, NULL, 0, &errmsg);
if (rc != SQLITE_OK) {
    fprintf(stderr, "SQL error: %s\n", errmsg);
    sqlite3_free(errmsg);
    sqlite3_close(db);
    return 1;
}

4. 获取数据

char *sql = "SELECT * from COMPANY";
rc = sqlite3_exec(db, sql, callback, 0, &errmsg);
if (rc != SQLITE_OK) {
    fprintf(stderr, "SQL error: %s\n", errmsg);
    sqlite3_free(errmsg);
    sqlite3_close(db);
    return 1;
}

5. 关闭数据库连接

sqlite3_close(db);