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Saturday, November 13, 2010

Unity 3d SQLite Database connection

C Sharp Script file to use wtih unity 3D. This one works with unity pro <= version 2.6 only free versions you can test but cannot build. And for Unity 3D 3 and above they don't support building for webplayer, standalone builds only work and you have to set standard .net 2.0 framework on build settings

dbAccess.cs


using UnityEngine;
using System;
using System.Collections;
using System.Data;
using Mono.Data.SqliteClient;

public class dbAccess : MonoBehaviour {
private string connection;
private IDbConnection dbcon;
private IDbCommand dbcmd;
private IDataReader reader;

// Use this for initialization
void Start () {

}

public void OpenDB(string p)
{
connection = "URI=file:" + p; // we set the connection to our database
dbcon = new SqliteConnection(connection);
dbcon.Open();
}

public void CloseDB(){
reader.Close(); // clean everything up
   reader = null;
   dbcmd.Dispose();
   dbcmd = null;
   dbcon.Close();
   dbcon = null;
}

IDataReader BasicQuery(string query){ // run a baic Sqlite query
dbcmd = dbcon.CreateCommand(); // create empty command
dbcmd.CommandText = query; // fill the command
reader = dbcmd.ExecuteReader(); // execute command which returns a reader
return reader; // return the reader

}


int CreateTable(string name,string[] col, string[] colType){ // Create a table, name, column array, column type array
string query;
query  = "CREATE TABLE " + name + "(" + col[0] + " " + colType[0];
for(var i=1; i
query += ", " + col[i] + " " + colType[i];
}
query += ")";
try{
dbcmd = dbcon.CreateCommand(); // create empty command
dbcmd.CommandText = query; // fill the command
reader = dbcmd.ExecuteReader(); // execute command which returns a reader
}
catch(Exception e){

Debug.Log(e);
return 0;
}
return 1;
}

int InsertIntoSingle(string tableName, string colName , string value ){ // single insert
string query;
query = "INSERT INTO " + tableName + "(" + colName + ") " + "VALUES (" + value + ")";
try
{
dbcmd = dbcon.CreateCommand(); // create empty command
dbcmd.CommandText = query; // fill the command
reader = dbcmd.ExecuteReader(); // execute command which returns a reader
}
catch(Exception e){

Debug.Log(e);
return 0;
}
return 1;
}

int InsertIntoSpecific(string tableName, string[] col, string[] values){ // Specific insert with col and values
string query;
query = "INSERT INTO " + tableName + "(" + col[0];
for(int i=1; i
query += ", " + col[i];
}
query += ") VALUES (" + values[0];
for(int i=1; i
query += ", " + values[i];
}
query += ")";
try
{
dbcmd = dbcon.CreateCommand();
dbcmd.CommandText = query;
reader = dbcmd.ExecuteReader();
}
catch(Exception e){

Debug.Log(e);
return 0;
}
return 1;
}

int InsertInto(string tableName , string[] values ){ // basic Insert with just values
string query;
query = "INSERT INTO " + tableName + " VALUES (" + values[0];
for(int i=1; i
query += ", " + values[i];
}
query += ")";
try
{
dbcmd = dbcon.CreateCommand();
dbcmd.CommandText = query;
reader = dbcmd.ExecuteReader();
}
catch(Exception e){

Debug.Log(e);
return 0;
}
return 1;
}

public string[] SingleSelectWhere(string tableName , string itemToSelect,string wCol,string wPar, string wValue){ // Selects a single Item
string query;
query = "SELECT " + itemToSelect + " FROM " + tableName + " WHERE " + wCol + wPar + wValue;
dbcmd = dbcon.CreateCommand();
dbcmd.CommandText = query;
reader = dbcmd.ExecuteReader();
string[] readArray = new string[reader.RecordsAffected];
int i=0;
while(reader.Read()){
readArray[i]=reader.GetString(0); // Fill array with all matches
i++;
}
return readArray; // return matches
}





// Update is called once per frame
void Update () {

}
}

The following few dlls have to be added inside Assets/Plugins folder

Mono.Data.Sqlite.dll
Mono.Data.SqliteClient.dll
MySql.Data.dll
sqlite3.dll
System.Data.dll

3 comments:

  1. good post, why didn't i meet this day before?

    I have a question: where do I need to store db file to gain access on mobile platforms(android and iphone)?

    ReplyDelete
  2. why an error appear on my unity project unexpected symbol 'p' etc..

    ReplyDelete
  3. I don't find any bug in the script. Please let me know the steps to produce the error you specify or produce the project so that I can help you fix the error.

    ReplyDelete