There is also sqlite3 in Android, mainly to record some basic grammars, ios provides encapsulated classes, and there is no need for the following operations
1. Create a database
#pragma mark - open database
-(BOOL)openDataBase{
//1, store the path, store the document in the sandbox of the current application
// NSArray *arrayPath=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
//
// NSString *documentPath= [arrayPath objectAtIndex:0];//document路径
NSString *documentPath= [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
//database path
NSString *sqlPath=[documentPath stringByAppendingPathComponent:@"applicationData.db"];
//open database
//sqlPath.UTF8String converted to c string, pointer to sqlite3
int result=sqlite3_open(sqlPath.UTF8String,&db);
if (result==SQLITE_OK) {
[self showDialogError:@"database open" andContent:@"success"];
return true;
}else{
sqlite3_close(db);
return false;
}
}
2. Create database tables
#pragma mark-create database table
-(BOOL)createTable:(NSMutableDictionary*) createTableRowParams{
char *sql;
//create sql statement
if ([createTableRowParams count]>0) {
}else{
sql= "create table if not exists UCS(id integer primary key,loginTime text,page text,pageCount integer);";
}
char *error=nil;
//Execute sql statement
sqlite3_exec(db, sql, nil, nil, &error);
if (error==nil) {
NSLog(@"The table was created successfully..");
}else{
NSLog(@"Failed to create table..");
}
return true;
}
3. Insert data:
////Insert data
-(void)insertTableData:(NSArray*)arrayData{
NSDate * senddate=[NSDate date];
NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
[dateformatter setDateFormat:@"YYYYMMddHHmmss"];
NSString * morelocationString=[dateformatter stringFromDate:senddate];
char *error=nil;
for(int n=0;n<10;n++){
// NSString *sql=[[NSString alloc]initWithFormat:@"insert into UCS(loginTime,page) values(?,?)",morelocationString,@"baihe"];
// char *sql1 = @"insert into UCS(loginTime,page) values(?,?)";
//
// sqlite3_exec(db, sql1, NULL, NULL, &error);
//
// }
char *sql="insert into UCS(loginTime,page,pageCount) values(?,?,?)";
sqlite3_stmt *stmt=nil;
if (sqlite3_prepare_v2(db, sql, -1, &stmt, NULL)==SQLITE_OK) {
sqlite3_bind_text(stmt, 1, "loginTimedata", -1, NULL);
sqlite3_bind_text(stmt, 2, "pagedata", -1, NULL);
sqlite3_bind_int(stmt, 3, 100);
}
if (sqlite3_step(stmt)!=SQLITE_DONE) {
NSLog(@"Failed to insert data.");
}else{
NSLog(@"Insert data successfully");
}
sqlite3_finalize(stmt);//Release
}
}
Query data:
//Inquire
-(void)selectTableData{
// NSString *sql=@"select * from UCS";
char *sql="select * from UCS;";
//
sqlite3_stmt *ppStmt;
// step through the statement
if (sqlite3_prepare_v2(db, sql, -1, &ppStmt, NULL) == SQLITE_OK) {
while (sqlite3_step(ppStmt)==SQLITE_ROW) {
int id5=sqlite3_column_int(ppStmt, 0);
char *cc=(char *)sqlite3_column_text(ppStmt, 2);
int id6=sqlite3_column_int(ppStmt, 3);
NSString *loginTime=[NSString stringWithUTF8String:cc];
NSLog(@"id=%d,loginTime=%@ %d",id5,loginTime,id6);
}
}
sqlite3_finalize(ppStmt);//Release
}
delete and update are similar