标签：
http://www.runoob.com/sqlite/sqlite-expressions.html
封装好的sql
using UnityEngine;
using System;
using System.Collections;
using Mono.Data.Sqlite;
public class DbAccess
{
private SqliteConnection dbConnection;
private SqliteCommand dbCommand;
private SqliteDataReader reader;
public DbAccess (string connectionString)
{
OpenDB (connectionString);
}
public DbAccess ()
{
}
public void OpenDB (string connectionString)
{
try
{
dbConnection = new SqliteConnection (connectionString);
dbConnection.Open ();
Debug.Log ("Connected to db");
}
catch(Exception e)
{
string temp1 = e.ToString();
Debug.Log(temp1);
}
}
public void CloseSqlConnection ()
{
if (dbCommand != null) {
dbCommand.Dispose ();
}
dbCommand = null;
if (reader != null) {
reader.Dispose ();
}
reader = null;
if (dbConnection != null) {
dbConnection.Close ();
}
dbConnection = null;
Debug.Log ("Disconnected from db.");
}
public SqliteDataReader ExecuteQuery (string sqlQuery)
{
dbCommand = dbConnection.CreateCommand ();
dbCommand.CommandText = sqlQuery;
reader = dbCommand.ExecuteReader ();
return reader;
}
public SqliteDataReader ReadFullTable (string tableName)
{
string query = "SELECT * FROM " + tableName;
return ExecuteQuery (query);
}
public SqliteDataReader InsertInto (string tableName, string[] values)
{
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)
{
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)
{
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)
{
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)
{
string query = "DELETE FROM " + tableName;
return ExecuteQuery (query);
}
public SqliteDataReader CreateTable (string name, string[] col, string[] colType)
{
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)
{
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);
}
}
一般调用
using UnityEngine;
using System.Collections;
using Mono.Data.Sqlite;
using System.IO;
public class ZYSQLTest : MonoBehaviour {
//创建表
void CreateMyCul()
{
string appDBPath = Application.persistentDataPath + "/zhongyingying.db";
if (!File.Exists(appDBPath))
{
DbAccess db = new DbAccess("URI=file:" + appDBPath);
db.CreateTable("zy", new string[] { "name", "age", "rank" }, new string[] { "text", "text", "text" });
Debug.Log("CreateSuccessful!创建表成功！");
db.CloseSqlConnection();
}
else
{
Debug.Log("File Exists!已经存在了！");
}
}
//插入数据
void InsertMyData()
{
string appDBPath = Application.persistentDataPath + "/zhongyingying.db";
DbAccess db = new DbAccess("URI=file:" + appDBPath);
Debug.Log(db);
db.InsertInto("zy", new string[] { "‘missZhong‘", "‘24‘", "‘1‘" });
db.InsertInto("zy", new string[] { "‘MrZhang‘", "‘22‘", "‘5‘" });
db.CloseSqlConnection();
Debug.Log("InsertInfoSuccessful！！！插入值成功！");
}
//删除数据
void DeleteMySelectedData()
{
string appDBPath = Application.persistentDataPath + "/zhongyingying.db";
DbAccess db = new DbAccess("URI=file:" + appDBPath);
db.Delete("zy", new string[] { "‘age‘" }, new string[] { "‘24‘" });
db.CloseSqlConnection();
Debug.Log("deleteSuccessful!删除成功！");
}
//查询数据
void SelectMyData()
{
string appDBPath = Application.persistentDataPath + "/zhongyingying.db";
DbAccess db = new DbAccess("URI=file:" + appDBPath);
SqliteDataReader sdr = db.SelectWhere("zy", new string[] { "age", "rank" }, new string[] { "age" }, new string[] { "=" }, new string[] { "24" });
db.CloseSqlConnection();
Debug.Log("SelectSuccessful!查询成功！");
Debug.Log("查询到的数据是______"+db);
}
//数据展示
void OnGUI()
{
if (GUI.Button(new Rect(350, 50, 100, 100), "创建表"))
{
CreateMyCul();
}
if (GUI.Button(new Rect(350, 200, 100, 100), "插入数据"))
{
InsertMyData();
}
if (GUI.Button(new Rect(350, 350, 100, 100), "删除数据"))
{
DeleteMySelectedData();
}
if (GUI.Button(new Rect(350, 500, 100, 100), "查询数据"))
{
SelectMyData();
}
}
}
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原文地址：http://www.cnblogs.com/ZeroMurder/p/5618407.html
