Use Sqlite3 command line under MAC

Sqlite3 command line simple to use

Sqlite3 Path//Open Database path connection
SELECT * from Sqlite_master where type= "table"; Show All Tables
SELECT * from testable; Display data for a table
. Help//View assistance
. Quit//exit

Xcode use Sqlite3 Step 1. Add Libsqlite3.dylib

2. Header files

////DbUtils.h//Smart////Created by Xie Han Festival on 15/5/12.//Copyright (c) 2015 WHR. All rights reserved.//#import <Foundation/Foundation.h> #import "sqlite3.h"  @interface dbutils : nsobject {Sqlite3 *db;//Declare a sqlite3 database}- (NSString*) FilePath;the path to the//database file. Generally in the sandbox documents inside the Operation-(void) opendb;-(void) closedb;-(Nsmutablearray*) Getalltypes;@end

. m file

////DBUTILS.M//Smart////Created by Xie Han Festival on 15/5/12.//Copyright (c) 2015 WHR. All rights reserved.//#import "DbUtils.h" #import "KMTypes.h" #import "KMContents.h"  @implementation dbutils //How to open a database- (void) opendb{whether or not the file exists    Nsfilemanager* FileManager = [NsfilemanagerDefaultmanager];NSString*dbpath=[ SelfFilePath];NSLog(@"Database path:%@", DBPath);BOOLSuccess = [FileManager Fileexistsatpath:dbpath];if(!success) {NSString*resourcepath=[[NSBundleMainbundle]resourcepath];//Automatic replication        NSString*sourcedbpath=[resourcepath stringbyappendingpathcomponent:@"App.bundle/datas.sqlite"];Nserror*error; Success = [FileManager Copyitematpath:sourcedbpath topath:dbpath error:&error];if(!success) NSAssert1 (0,@"Database attach failed!" '%@ '. ", [error localizeddescription]);Else            NSLog(@"Database Attach succeeded:%@", DBPath); }if(Sqlite3_open ([[ SelfFilePath] utf8string], &db)! = SQLITE_OK) {sqlite3_close (db); Nsassert (0, @"Database open failed. "); }}- (void) closedb{sqlite3_close (db);}//This method is used to return the full path information of the database in the Documents folder- (NSString*) filepath{Nsarray*paths = Nssearchpathfordirectoriesindomains (NSDocumentDirectory, Nsuserdomainmask,YES);NSString*documentsdir = [Paths Objectatindex:0];return[Documentsdir stringbyappendingpathcomponent:@"Datas.sqlite"];}////Querying data all categories- (Nsmutablearray*) getalltypes{[ SelfOPENDB];Nsmutablearray*array=[NsmutablearrayArraywithcapacity:6];NSString*sql = @"SELECT * from Km_types"; Sqlite3_stmt *statement;if(SQLITE3_PREPARE_V2 (DB, [SQL Utf8string],-1, &statement,Nil) = = SQLITE_OK) { while(Sqlite3_step (statement) = = Sqlite_row) {kmtypes* k= [[Kmtypes alloc]init];inttype_id = (int) Sqlite3_column_int (statement,0);intparent_id = (int) Sqlite3_column_int (statement,1);Char*type_title = (Char*) Sqlite3_column_text (statement,2);intType_order = (int) Sqlite3_column_int (statement,3);intTopic_count= (int) Sqlite3_column_int (statement,4);NSString*TYPE_TITLESTR = [[NSStringAlloc] Initwithutf8string:type_title]; K. Type_title= Type_titlestr; K. type_id=type_id; K. parent_id= parent_id; K. Type_order= Type_order; K. Topic_count=topic_count;        [Array addobject:k];    } sqlite3_finalize (statement); }    [ SelfClosedb];returnArray;}@endOnly one simple query function is implemented here.

Use Sqlite3 command line under MAC