做iOS开发以来，一直运用的第三方数据库的增删改查，项目多次出现读取数据出现问题，自己也不知道如何查起，后来经过查资料，自己写了几个方法来实现数据的增删改查功能：
首先在TARGETS---》》Build phases里面添加数据库所关联的库文件libsqlite3.tbd
添加完以后，在控制器上添加
#import且增加属性
{
sqlite3*db;
}
在.m文件中实现增删改查的方法即可
#import"ViewController.h"
#define DBNAME @"personinfo.sqlite"
#define NAME @"name"
#define AGE @"age"
#define ADDRESS @"address"
#define TABLENAME @"PERSONINFO"
@interfaceViewController()
@end
@implementationViewController
- (void)viewDidLoad {
[superviewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[selfOpenDataBase];
[selfcreateTable];
[selfInsertData];
[selfSelectData];
[selfdeleteData];
[selfupdateData];
}
#pragma mark-----------打开数据库
-(void)OpenDataBase
{
NSArray*paths =NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString*documents = [pathsobjectAtIndex:0];
NSString*database_path = [documentsstringByAppendingPathComponent:DBNAME];
if(sqlite3_open([database_pathUTF8String], &db) !=SQLITE_OK) {
sqlite3_close(db);
NSLog(@"数据库打开失败");
}
}
#pragma mark----------创建数据表PERSONINFO的语句
-(void)createTable
{
NSString*sqlCreateTable =@"CREATE TABLE IF NOT EXISTS PERSONINFO (ID INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT, age INTEGER, address TEXT)";
[selfexecSql:sqlCreateTable];
}
#pragma mark------------创建一个独立的执行sql语句的方法
-(void)execSql:(NSString*)sql
{
char*err;
if(sqlite3_exec(db, [sqlUTF8String],NULL,NULL, &err) !=SQLITE_OK) {
sqlite3_close(db);
NSLog(@"数据库操作数据失败!");
}
}
#pragma mark------------增加数据
-(void)InsertData
{
NSString*sql1 = [NSStringstringWithFormat:
@"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",
TABLENAME,NAME,AGE,ADDRESS,@"张三",@"18",@"北京"];
NSString*sql2 = [NSStringstringWithFormat:
@"INSERT INTO '%@' ('%@', '%@', '%@') VALUES ('%@', '%@', '%@')",
TABLENAME,NAME,AGE,ADDRESS,@"老四",@"19",@"深圳"];
[selfexecSql:sql1];
[selfexecSql:sql2];
}
#pragma mark----------------删除数据
-(void)deleteData
{
sqlite3_stmt*statement;
NSString*sqlStr = [NSStringstringWithFormat:@"DELETE FROM PERSONINFO WHERE age = %d",19];
// NSString *sqlStr = [NSString stringWithFormat:@"DELETE FROM PERSONINFO"];
intresult =sqlite3_prepare_v2(db, [sqlStrUTF8String], -1, &statement,NULL);
if(result ==SQLITE_OK) {
if(sqlite3_step(statement) ==SQLITE_ROW) {//觉的应加一个判断,若有这一行则删除
if(sqlite3_step(statement) ==SQLITE_DONE) {
sqlite3_finalize(statement);
sqlite3_close(db);
}
}
}
sqlite3_finalize(statement);
sqlite3_close(db);
NSLog(@"-------删除后---------");
[selfSelectData];
}
#pragma mark----------修改数据
-(void)updateData
{
sqlite3_stmt*statement;
NSString*sqlStr = [NSStringstringWithFormat:@"update PERSONINFO set name = '%@' where age = %d",@"王五",18];
//[db executeUpdate:@"UPDATE User SET Name = ? WHERE Name = ? ",@"李四",@"张三"];
intresult =sqlite3_prepare_v2(db, [sqlStrUTF8String], -1, &statement,NULL);
if(result ==SQLITE_OK) {
if(sqlite3_step(statement) ==SQLITE_ROW) {//觉的应加一个判断,若有这一行则修改
if(sqlite3_step(statement) ==SQLITE_DONE) {
sqlite3_finalize(statement);
sqlite3_close(db);
}
}
}
sqlite3_finalize(statement);
sqlite3_close(db);
NSLog(@"------修改后----------");
[selfSelectData];
}
#pragma mark-----------------查询数据
-(void)SelectData
{
NSString*sqlQuery =@"SELECT * FROM PERSONINFO";
sqlite3_stmt* statement;
if(sqlite3_prepare_v2(db, [sqlQueryUTF8String], -1, &statement,nil) ==SQLITE_OK) {
while(sqlite3_step(statement) ==SQLITE_ROW) {
char*name = (char*)sqlite3_column_text(statement,1);
NSString*nsNameStr = [[NSStringalloc]initWithUTF8String:name];
intage =sqlite3_column_int(statement,2);
char*address = (char*)sqlite3_column_text(statement,3);
NSString*nsAddressStr = [[NSStringalloc]initWithUTF8String:address];
NSLog(@"name:%@ age:%d address:%@",nsNameStr,age, nsAddressStr);
}
}
sqlite3_close(db);
}