SQLite additions and deletions to search

SQLite is an C open source library written in a language that implements a self-contained SQL关系型数据库引擎 , SQLite large amount of data that can be manipulated using storage, and as a relational database we can create multiple tables in a database to solve a large number of data duplication problems. And the SQLite library is optimized for use on mobile devices.

Because SQLiteThe interface uses CWritten, and Objective-CIs CSo that you can use it directly in your project SQLite。
Wrote a little demo,git:https://github.com/yangchengzh/pachagingsqlite.
The following is the key part of the code static Sqlite3 *db;
-(Sqlite3 *) opendb
{
Indicates that the database has been opened
if (db!=nil) {
return DB;
}
Nsstring*doc = [Nssearchpathfordirectoriesindomains (Nsdocumentdirectory,nsuserdomainmask, YES) lastObject];
Nsstring*filename = [docstringbyappendingpathcomponent:@ "Perple.sqlite"];

Converts an OC string to a C-language string
Const CHAR*CFILENAME = filename.utf8string;
Open the database file (the function will automatically create the database file if the database file does not exist)
int result =sqlite3_open (cFileName, &db);
if (result== sqlite_ok) {
NSLog (@ "database is open");
} else{
NSLog (@ "Database open failed");
}
RETURNDB;
}

-(void) closedb
{
int result =sqlite3_close (db);
if (result== sqlite_ok) {
NSLog (@ "Database closed");
db = nil;
} else{
NSLog (@ "Database shutdown failed");
}
}

-(void) creattable
{
db = [SELFOPENDB];
Nsstring*sql = @ "CREATE table IF not EXISTS perpletable (number integerprimary key isn't null, name text NOT NULL, gender Tex T not NULL, Ageinteger not null) ";

int result =sqlite3_exec (db, SQL. Utf8string, NULL, NULL, NULL);
if (result== sqlite_ok) {
NSLog (@ "CREATE table succeeded");
} else{
NSLog (@ "Failed to create TABLE");
}
[Selfclosedb];
}

-(void) Insertwithmodel: (Personmodel *) model
{
db = [SELFOPENDB];
Nsstring*sql = [NSString stringwithformat:@ "INSERT into perpletable (number,name, gender, age) VALUES ('%ld ', '%@ ', '%@ ', ' %ld ') ", Model.number,model.name, Model.gender, Model.age];
int result =sqlite3_exec (db, SQL. Utf8string, NULL, NULL, NULL);
if (result== sqlite_ok) {
NSLog (@ "add success");
} else{
NSLog (@ "Add failed");
}
[Selfclosedb];
}

-(void) Delatewithage: (Nsinteger) Age
{
db = [SELFOPENDB];
Nsstring*sql = [NSString stringwithformat:@ "Delete from perpletable whereage = '%ld '", age];
int result =sqlite3_exec (db, SQL. Utf8string, NULL, NULL, NULL);
if (result== sqlite_ok) {
NSLog (@ "Delete succeeded");
} else{
NSLog (@ "Delete table failed");
}
[Selfclosedb];
}

-(void) Delatewithname: (NSString *) name
{
db = [SELFOPENDB];
Nsstring*sql = [NSString stringwithformat:@ "Delete from perpletable wherename = '%@ '", name];
int result =sqlite3_exec (db, SQL. Utf8string, NULL, NULL, NULL);
if (result== sqlite_ok) {
NSLog (@ "Delete succeeded");
} else{
NSLog (@ "Delete table failed");
}
[Selfclosedb];
}

-(void) Updatewithname: (NSString *) name Byage: (Nsinteger) Age
{
db = [SELFOPENDB];
Nsstring*sql = [NSString stringwithformat:@ "Update perpletable set name = '%@ ' where age = '%ld '", name, age];
int result =sqlite3_exec (db, SQL. Utf8string, NULL, NULL, NULL);
if (result== sqlite_ok) {
NSLog (@ "Update data success");
} else{
NSLog (@ "Failed to update data");
}
[Selfclosedb];
}

-(void) Selertall
{
1. Open the Database
db = [SELFOPENDB];
2. Write SQL statements
Nsstring*sql = @ "SELECT * from perpletable";
3. Create a follow pointer
sqlite3_stmt*stmt = nil;
4. Execute the statement
int result =SQLITE3_PREPARE_V2 (db, SQL. Utf8string,-1, &stmt, NULL);
5. Determine if the statement is correct
if (result== sqlite_ok) {
NSLog (@ "Query success");
6. Execute the query
while (Sqlite3_step (stmt) = = Sqlite_row) {
7. Satisfy the condition read data
int number = Sqlite3_column_int (stmt, 0);
Const unsigned char *name = Sqlite3_column_text (stmt, 1);
Const unsigned char *gender = Sqlite3_column_text (stmt, 2);
int age = Sqlite3_column_int (stmt, 3);
NSLog (@ "name =%s, Number =%d, gender =%s, age =%d", Name,number, gender, age);
}

} else{
NSLog (@ "Query failed");
}
8. Release the pointer
Sqlite3_finalize (stmt);
9. Close the database
[Selfclosedb];
}

-(void) Selertwithage: (Nsinteger) Age
{
db = [SELFOPENDB];
Nsstring*sql = [NSString stringwithformat:@ "select * from perpletable whereage =%ld", age];
sqlite3_stmt*stmt = nil;
int result =SQLITE3_PREPARE_V2 (db, SQL. Utf8string,-1, &stmt, NULL);
if (result== sqlite_ok) {
NSLog (@ "Query success");
while (Sqlite3_step (stmt) = = Sqlite_row) {
Const unsigned char *name = Sqlite3_column_text (stmt, 1);
Const unsigned char *gender = Sqlite3_column_text (stmt, 2);
int number = Sqlite3_column_int (stmt, 0);
int age = Sqlite3_column_int (stmt, 3);
NSLog (@ "name =%s, Number =%d, gender =%s, age =%d", Name,number, gender, age);
}

} else{
NSLog (@ "Query failed");
}
Sqlite3_finalize (stmt);
[Selfclosedb];
}

SQLite additions and deletions to search