仅供自己记录使用，
h文件
#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
#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
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