unity3d sqlite数据库的读写方法
首先，我们要从unity的安装路径中复制mono.data.sqlite.dll和sqlite3.dll两个动态链接库到untiy的plugins目录下，如下图所示：
使用navicat for sqlite创建一个sqlite数据库文件，放到Resources文件夹目录中，如下图所示：
新建一个DbAccess脚步，添加以下脚步：
using UnityEngine;
using System;
using System.Collections;
using Mono.Data.Sqlite;
using System.IO;
public class DbAccess {
private SqliteConnection dbConnection;//sql连接
private SqliteCommand dbCommand=null;//sql命令
private SqliteDataReader dbReader;//sql读取器
public DbAccess(string connectionString)
{
string appDBPath = "";
if(Application.platform == RuntimePlatform.WindowsEditor)//如果是windows编辑器中
{
appDBPath = Application.dataPath+"//"+connectionString;
}
else if(Application.platform == RuntimePlatform.Android)--如果是安卓平台
{
appDBPath = Application.persistentDataPath +"/" + connectionString;
if (!File.Exists(appDBPath))
{
WWW loader = new WWW("jar:file://" + Application.dataPath + "/" + connectionString);//把数据库复制到安卓可写路径中，注：sqlite不能在安装包中读取数据
File.WriteAllBytes(appDBPath,loader.bytes);
}
}
OpenDB("Data Source="+appDBPath);
}
private void OpenDB(string connectionString)
{
try
{
dbConnection = new SqliteConnection(connectionString);
dbConnection.Open();
Debug.Log("connect to db");
}
catch (System.Exception ex)
{
Debug.Log(ex.Message);
}
}
public void CloseSqlConnection()//关闭数据库连接
{
if (dbCommand!=null)
dbCommand.Dispose();
dbCommand = null;
if (dbReader!=null)
dbReader.Dispose();
dbReader = null;
if (dbConnection!=null)
dbConnection.Close();
dbConnection = null;
}
public SqliteDataReader ExecuteQuery(string sqlQuery)//执行查询
{
dbCommand = dbConnection.CreateCommand();
dbCommand.CommandText = sqlQuery;
dbReader = dbCommand.ExecuteReader();
return dbReader;
}
public SqliteDataReader ReadFullTable(string tableName)//读取整个表
{
string query = "SELECT * FROM " + tableName+";";
return ExecuteQuery(query);
}
public SqliteDataReader InsertInto(string tableName,string[] values)//在表中插入数据
{
string query = "INSERT INTO " + tableName + " VALUES('" + values[0];
for (int i = 1; i < values.Length;i++ )
{
query += "','" + values[i];
}
query += "')";
return ExecuteQuery(query);
}
public SqliteDataReader UpdateInto(string tableName,string[] cols,string colsValues,string selectKey,string selectValue)//替换表中数据
{
string query = "UPDATE " + tableName + " SET " + cols[0] + " = " + colsValues[0];
for (int i = 1; i < colsValues.Length; ++i)
{
query += ", " + cols[i] + " =" + colsValues[i];
}
query += " WHERE " + selectKey + " = " + selectValue + " ";
return ExecuteQuery(query);
}
public SqliteDataReader Delete(string tableName, string[] cols, string[] colsvalues)//删除表中数据
{
string query = "DELETE FROM " + tableName + " WHERE " + cols[0] + " = " + colsvalues[0];
for (int i = 1; i < colsvalues.Length; ++i)
{
query += " or " + cols[i] + " = " + colsvalues[i];
}
return ExecuteQuery(query);
}
public SqliteDataReader InsertIntoSpecific (string tableName, string[] cols, string[] values)//插入特定值
{
if (cols.Length != values.Length) {
throw new SqliteException ("columns.Length != values.Length");
}
string query = "INSERT INTO " + tableName + "(" + cols[0];
for (int i = 1; i < cols.Length; ++i) {
query += ", " + cols[i];
}
query += ") VALUES (" + values[0];
for (int i = 1; i < values.Length; ++i) {
query += ", " + values[i];
}
query += ")";
return ExecuteQuery (query);
}
public SqliteDataReader DeleteContents (string tableName)//删除表
{
string query = "DELETE FROM " + tableName;
return ExecuteQuery (query);
}
public SqliteDataReader CreateTable (string name, string[] col, string[] colType)//创建表
{
if (col.Length != colType.Length) {
throw new SqliteException ("columns.Length != colType.Length");
}
string query = "CREATE TABLE " + name + " (" + col[0] + " " + colType[0];
for (int i = 1; i < col.Length; ++i) {
query += ", " + col[i] + " " + colType[i];
}
query += ")";
return ExecuteQuery (query);
}
public SqliteDataReader SelectWhere (string tableName, string[] items, string[] col, string[] operation, string[] values)//集成所有操作后执行
{
if (col.Length != operation.Length || operation.Length != values.Length) {
throw new SqliteException ("col.Length != operation.Length != values.Length");
}
string query = "SELECT " + items[0];
for (int i = 1; i < items.Length; ++i) {
query += ", " + items[i];
}
query += " FROM " + tableName + " WHERE " + col[0] + operation[0] + "'" + values[0] + "' ";
for (int i = 1; i < col.Length; ++i) {
query += " AND " + col[i] + operation[i] + "'" + values[0] + "' ";
}
return ExecuteQuery (query);
}
}
使用事例：
数据库的Dialog表中有一下数据：
DbAccess db = new DbAccess("/Resources/DazzleParkour.sqlite");
using (SqliteDataReader reader = db.SelectWhere("Dialog", new string[] { "id,Name,FileName,Scale" }, new string[] { "Scale" }, new string[] { "=" }, new string[] { "1" }))//读取出Scale等于1的数据
{
while (reader.Read())// 循环遍历数据
{
int name = reader.GetInt32(reader.GetOrdinal("id"));
Debug.Log(name);
}
reader.Close();
db.CloseSqlConnection();
}
最后打印的数据如下
在打包时，注意要把playersetting里的api解析等级改为.Net 2.0
