Question

我能够为我的sqlite数据库创建表，但是我无法在终端中查看这个表我的代码

-(void)initDatabase
{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *databasePath = [documentsDirectory stringByAppendingPathComponent:@"Database.sql"];

    bool databaseAlreadyExists = [[NSFileManager defaultManager] fileExistsAtPath:databasePath];

    if (sqlite3_open([databasePath UTF8String], &databaseHandle) == SQLITE_OK)
    {

        if (!databaseAlreadyExists)
        {
            // Create the PERSON table
            const char *sqlStatement = "CREATE TABLE IF NOT EXISTS PERSON (ID INTEGER PRIMARY KEY AUTOINCREMENT, FIRSTNAME TEXT, LASTNAME TEXT, BIRTHDAY DATE)";
            char *error;
            if (sqlite3_exec(databaseHandle, sqlStatement, NULL, NULL, &error) == SQLITE_OK)
            {
                // Create the ADDRESS table with foreign key to the PERSON table
                sqlStatement = "CREATE TABLE IF NOT EXISTS ADDRESS (ID INTEGER PRIMARY KEY AUTOINCREMENT, STREETNAME TEXT, STREETNUMBER INT, PERSONID INT, FOREIGN KEY(PERSONID) REFERENCES PERSON(ID))";
                if (sqlite3_exec(databaseHandle, sqlStatement, NULL, NULL, &error) == SQLITE_OK)
                {
                    NSLog(@"Database and tables created.");
                }
                else
                {
                    NSLog(@"Error: %s", error);
                }
            }
            else
            {
                NSLog(@"Error: %s", error);
            }
        }
    }

这是我的控制台输出Database and tables created.

然后我尝试在这个终端中打开那个数据库

p-mac001:~ Th$ sqlite3 /Users/Th/Desktop/sample/Database.sql 
SQLite version 3.7.7 2011-06-25 16:35:41
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .tables

我无法看到任何表格引导我在哪里做错了..

Answer 1

我已经使用iPhone 5.0模拟器对其进行了测试，您的代码正常运行。

SQLite version 3.7.7 2011-06-25 16:35:41
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> .tables
ADDRESS  PERSON

编辑：

在这里你有我的代码，它和你的完全一样：

#import <sqlite3.h>

@implementation FFViewController
-(void)initDatabase
{

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *databasePath = [documentsDirectory stringByAppendingPathComponent:@"Database.sql"];

    bool databaseAlreadyExists = [[NSFileManager defaultManager] fileExistsAtPath:databasePath];
    sqlite3 *databaseHandle = NULL;

    if (sqlite3_open([databasePath UTF8String], &databaseHandle) == SQLITE_OK)
    {

        if (!databaseAlreadyExists)
        {
            // Create the PERSON table
            const char *sqlStatement = "CREATE TABLE IF NOT EXISTS PERSON (ID INTEGER PRIMARY KEY AUTOINCREMENT, FIRSTNAME TEXT, LASTNAME TEXT, BIRTHDAY DATE)";
            char *error;
            if (sqlite3_exec(databaseHandle, sqlStatement, NULL, NULL, &error) == SQLITE_OK)
            {
                // Create the ADDRESS table with foreign key to the PERSON table
                sqlStatement = "CREATE TABLE IF NOT EXISTS ADDRESS (ID INTEGER PRIMARY KEY AUTOINCREMENT, STREETNAME TEXT, STREETNUMBER INT, PERSONID INT, FOREIGN KEY(PERSONID) REFERENCES PERSON(ID))";
                if (sqlite3_exec(databaseHandle, sqlStatement, NULL, NULL, &error) == SQLITE_OK)
                {
                    NSLog(@"Database and tables created.");
                }
                else
                {
                    NSLog(@"Error: %s", error);
                }
            }
            else
            {
                NSLog(@"Error: %s", error);
            }
        }
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    [self initDatabase];
}

@end

如何在iPhone中以编程方式插入和查看数据到sqlite数据库

1 个答案: