FMDB的一些基本操作小结

http://blog.csdn.net/iunion/article/details/7204625

仅供自己记录使用，

h文件

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#import <Foundation/Foundation.h>

#import "FMDatabase.h"

#import "FMDatabaseAdditions.h"

@interface wiDBRoot : NSObject

@property (retain, nonatomic) FMDatabase *DB;

@property (retain, nonatomic) NSString *DBName;

//+ (id)modelWithDBName:(NSString *)dbName;

- (id)initWithDBName:(NSString *)dbName;

// 删除数据库

- (void)deleteDatabse;

// 数据库存储路径

//- (NSString *)getPath:(NSString *)dbName;

// 打开数据库

- (void)readyDatabse;

// 判断是否存在表

- (BOOL) isTableOK:(NSString *)tableName;

// 获得表的数据条数

- (BOOL) getTableItemCount:(NSString *)tableName;

// 创建表

- (BOOL) createTable:(NSString *)tableName withArguments:(NSString *)arguments;

// 删除表-彻底删除表

- (BOOL) deleteTable:(NSString *)tableName;

// 清除表-清数据

- (BOOL) eraseTable:(NSString *)tableName;

// 插入数据

- (BOOL)insertTable:(NSString*)sql, ...;

// 修改数据

- (BOOL)updateTable:(NSString*)sql, ...;

// 整型

- (NSInteger)getDb_Integerdata:(NSString *)tableName withFieldName:(NSString *)fieldName;

// 布尔型

- (BOOL)getDb_Booldata:(NSString *)tableName withFieldName:(NSString *)fieldName;

// 字符串型

- (NSString *)getDb_Stringdata:(NSString *)tableName withFieldName:(NSString *)fieldName;

// 二进制数据型

- (NSData *)getDb_Bolbdata:(NSString *)tableName withFieldName:(NSString *)fieldName;

@end

m文件

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#import "wiDBRoot.h"

@interface wiDBRoot ()

- (NSString *)getPath:(NSString *)dbName;

@end

@implementation wiDBRoot

@synthesize DB;

@synthesize DBName;

/*

+ (id)modelWithDBName:(NSString *)dbName

{

[[[self alloc] initWithDBName:dbName] autorelease];

return self;

}

*/

- (id)initWithDBName:(NSString *)dbName

{

self = [super init];

if(nil != self)

{

DBName = [self getPath:dbName];

WILog(@"DBName: %@", DBName);

}

return self;

}

- (void)dealloc {

[DB close];

[DB release];

[DBName release];

[super dealloc];

}

// 数据库存储路径(内部使用)

- (NSString *)getPath:(NSString *)dbName

{

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

return [documentsDirectory stringByAppendingPathComponent:dbName];

}

// 打开数据库

- (void)readyDatabse

{

//BOOL success;

//NSError *error;

//NSFileManager *fileManager = [NSFileManager defaultManager];

//success = [fileManager fileExistsAtPath:self.DBName];

if ([DB databaseExists])

return;

//DB = [FMDatabase databaseWithPath:DBName];

DB = [[FMDatabase alloc] initWithPath:DBName];

if (![DB open])

{

[DB close];

NSAssert1(0, @"Failed to open database file with message '%@'.", [DB lastErrorMessage]);

}

// kind of experimentalish.

[DB setShouldCacheStatements:YES];

}

#pragma mark 删除数据库

// 删除数据库

- (void)deleteDatabse

{

BOOL success;

NSError *error;

NSFileManager *fileManager = [NSFileManager defaultManager];

// delete the old db.

if ([fileManager fileExistsAtPath:DBName])

{

[DB close];

success = [fileManager removeItemAtPath:DBName error:&error];

if (!success) {

NSAssert1(0, @"Failed to delete old database file with message '%@'.", [error localizedDescription]);

}

}

}

// 判断是否存在表

- (BOOL) isTableOK:(NSString *)tableName

{

FMResultSet *rs = [DB executeQuery:@"SELECT count(*) as 'count' FROM sqlite_master WHERE type ='table' and name = ?", tableName];

while ([rs next])

{

// just print out what we've got in a number of formats.

NSInteger count = [rs intForColumn:@"count"];

WILog(@"isTableOK %d", count);

if (0 == count)

{

return NO;

}

else

{

return YES;

}

}

return NO;

}

// 获得表的数据条数

- (BOOL) getTableItemCount:(NSString *)tableName

{

NSString *sqlstr = [NSString stringWithFormat:@"SELECT count(*) as 'count' FROM %@", tableName];

FMResultSet *rs = [DB executeQuery:sqlstr];

while ([rs next])

{

// just print out what we've got in a number of formats.

NSInteger count = [rs intForColumn:@"count"];

WILog(@"TableItemCount %d", count);

return count;

}

return 0;

}

// 创建表

- (BOOL) createTable:(NSString *)tableName withArguments:(NSString *)arguments

{

NSString *sqlstr = [NSString stringWithFormat:@"CREATE TABLE %@ (%@)", tableName, arguments];

if (![DB executeUpdate:sqlstr])

//if ([DB executeUpdate:@"create table user (name text, pass text)"] == nil)

{

WILog(@"Create db error!");

return NO;

}

return YES;

}

// 删除表

- (BOOL) deleteTable:(NSString *)tableName

{

NSString *sqlstr = [NSString stringWithFormat:@"DROP TABLE %@", tableName];

if (![DB executeUpdate:sqlstr])

{

WILog(@"Delete table error!");

return NO;

}

return YES;

}

// 清除表

- (BOOL) eraseTable:(NSString *)tableName

{

NSString *sqlstr = [NSString stringWithFormat:@"DELETE FROM %@", tableName];

if (![DB executeUpdate:sqlstr])

{

WILog(@"Erase table error!");

return NO;

}

return YES;

}

// 插入数据

- (BOOL)insertTable:(NSString*)sql, ...

{

va_list args;

va_start(args, sql);

BOOL result = [DB executeUpdate:sql error:nil withArgumentsInArray:nil orVAList:args];

va_end(args);

return result;

}

// 修改数据

- (BOOL)updateTable:(NSString*)sql, ...

{

va_list args;

va_start(args, sql);

BOOL result = [DB executeUpdate:sql error:nil withArgumentsInArray:nil orVAList:args];

va_end(args);

return result;

}

// 暂时无用

#pragma mark 获得单一数据

// 整型

- (NSInteger)getDb_Integerdata:(NSString *)tableName withFieldName:(NSString *)fieldName

{

NSInteger result = NO;

NSString *sql = [NSString stringWithFormat:@"SELECT %@ FROM %@", fieldName, tableName];

FMResultSet *rs = [DB executeQuery:sql];

if ([rs next])

result = [rs intForColumnIndex:0];

[rs close];

return result;

}

// 布尔型

- (BOOL)getDb_Booldata:(NSString *)tableName withFieldName:(NSString *)fieldName

{

BOOL result;

result = [self getDb_Integerdata:tableName withFieldName:fieldName];

return result;

}

// 字符串型

- (NSString *)getDb_Stringdata:(NSString *)tableName withFieldName:(NSString *)fieldName

{

NSString *result = NO;

NSString *sql = [NSString stringWithFormat:@"SELECT %@ FROM %@", fieldName, tableName];

FMResultSet *rs = [DB executeQuery:sql];

if ([rs next])

result = [rs stringForColumnIndex:0];

[rs close];

return result;

}

// 二进制数据型

- (NSData *)getDb_Bolbdata:(NSString *)tableName withFieldName:(NSString *)fieldName

{

NSData *result = NO;

NSString *sql = [NSString stringWithFormat:@"SELECT %@ FROM %@", fieldName, tableName];

FMResultSet *rs = [DB executeQuery:sql];

if ([rs next])

result = [rs dataForColumnIndex:0];

[rs close];

return result;

}

@end