SQLite数据操作

1.向学生表中插入100条数据

2.按条件查询学生数据

3.修改学生数据

4.删除学生数据

import UIKit

class ViewController: UIViewController {

lazy var documentsPath:String={

let paths=NSSearchPathForDirectoriesInDomains(.DocumentDirectory,.UserDomainMask,true)

return paths.first!

}()

var db:COpaquePointer=nil

var stmt:COpaquePointer=nil

override func viewDidLoad() {

super.viewDidLoad()

createOrOpenDatabase()

//createTable()

//基本步骤

//1.打开数据库

//2.处理数据

//3.关闭数据库

//插入数据

//insertStudents()

//查询数据

//queryStudents()

//修改学生数据

//updateStudent()

//queryStudents()

//删除学生数据

deleteStudents()

queryStudents()

//关闭数据库

sqlite3_close(db)

}

extension ViewController{

func createOrOpenDatabase(){

print("\(NSHomeDirectory())")

let path:NSString = "\(documentsPath)/test.sqlite3"

let filename=path.UTF8String

if sqlite3_open(filename,&db) != SQLITE_OK {

print("create or open failed.......")

sqlite3_close(db)

}

func createTable(){

let string:NSString = "create table if not exists Student(id integer primary key autoincrement,sno text,name text,score,integer)"

let sql = string.UTF8String

if sqlite3_exec(db,sql,nil,nil,nil) != SQLITE_OK{

print("create table failed......")

sqlite3_close(db)

}

func insertStudents(){

//sno: "1001~1100"

//name: "[a-j][01-10]"

//score: 0-100

let strs1=["a","b","c","d","e","f","g","h","i","j"]

let strs2=["01","02","03","04","05","06","07","08","09","10"]

for i in 0..<100{

let sno="\(1001+i)"

let name=strs1[i/10] + strs2[i%10]

let score=i

insertStudent(sno:sno,name:name,score:score)

}

func insertStudent(sno sno:String,name:String,score:Int){

//准备SQL语句

let string:NSString="insert into Student(sno,name,score) values(?,?,?)"

let sql=string.UTF8String

//解析SQL文本语句

if sqlite3_prepare_v2(db,sql,-1,&stmt,nil) != SQLITE_OK{

sqlite3_close(db)

print("\(sno),insert failed......")

}

//绑定参数

let csno=(sno as NSString).UTF8String

let cname=(name as NSString).UTF8String

sqlite3_bind_text(stmt,1,csno,-1,nil)

sqlite3_bind_text(stmt,2,cname,-1,nil)

sqlite3_bind_int(stmt,3,Int32(score))

//执行SQL语句

if sqlite3_step(stmt) == SQLITE_ERROR{

sqlite3_close(db)

print("\(sno),insert failed......")

}else{

//释放资源

sqlite3_finalize(stmt)

}

func queryStudents(){

//准备SQL语句

let string:NSString="select sno,name,score from Student"

//let string:NSString="select sno,name,score from Student where score > 60"

//let string:NSString="select sno,name,score from Student where name like 'a%'"

let sql=string.UTF8String

//解析SQL文本语句

if sqlite3_prepare_v2(db,sql,-1,&stmt,nil) != SQLITE_OK{

sqlite3_close(db)

print("query failed......")

return

}

//执行SQL语句

while sqlite3_step(stmt) == SQLITE_ROW{

let csno = sqlite3_column_text(stmt,0)

let sno = NSString(UTF8String:UnsafePointer(csno))!

let cname = sqlite3_column_text(stmt,1)

let name=NSString(UTF8String:UnsafePointer(cname))!

let score=sqlite3_column_int(stmt,2)

print("\(sno),\(name),\(score)")

}

//释放资源

sqlite3_finalize(stmt)

}

func updateStudent(){

let string:NSString = "update Student set score = 100 where name like 'a%'"

let sql = string.UTF8String

if sqlite3_exec(db,sql,nil,nil,nil) != SQLITE_OK{

sqlite3_close(db)

print("update failed......")

}

func deleteStudents(){

let string:NSString="delete from Student where score <60"

let sql = string.UTF8String

if sqlite3_exec(db,sql,nil,nil,nil) != SQLITE_OK {

sqlite3_close(db)

print("delete failed......")

}

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