Unity3D操作MySQL
最近数据库用的比较多，顺便整理下MySQL的常用语句。
1.打开数据库
SqlAccess sql = new SqlAccess();
sql.OpenSql(“数据库名称”);
public MySqlConnection dbConnection;
string host = "localhost";
string id = "root";
public void OpenSql(string db)
{
try
{
string connectionString = string.Format("Server = {0};port={4};Database = {1}; User ID = {2}; Password = {3};charset=utf8;", host, db, id, "密码","端口");
dbConnection = new MySqlConnection(connectionString);
dbConnection.Open();
}
catch (Exception e)
{
UnityEngine.Debug.Log("SQL:服务器连接失败，请重新检查是否打开MySql服务。" + e.Message.ToString());
}
}2.创建表
sql.CreateTableAutoID(“tablename”,new string[] {“学号”,“姓名” },new string[] { “VARCHAR(255)”,“VARCHAR(255)” });
/// 3.删除表
sql.DeleteTable(“tablename”);
public DataSet DeleteTable(string name)
{
string query = "DROP TABLE " + name.ToString();//+ " NOT NULL AUTO_INCREMENT";
return ExecuteQuery(query);
}4.插入一条数据
sql.InsertInto(“tablename”,new string[] {“学号”,“姓名” },new string[] { “001”,“张三” });
/// 5.同时插入多条数据
sql.InsertIntos(“tablename”,new string[] { “学号”, “姓名” },new List
/// 6.删除数据
/// 7.查找
/// 匹配的数据
public List<string> SearchAssign(string table, string key, string match)
{
List<string> txet = new List<string>();
if (dbConnection == null)
return txet;
string sqlSearch = "select * from " + table + " WHERE " + key + "=" + match;
MySqlCommand mySqlCommand = new MySqlCommand(sqlSearch, dbConnection);
MySqlDataReader reader = mySqlCommand.ExecuteReader();
try
{
while (reader.Read())
{
if (reader.HasRows)
{
for (int i = 0; i < reader.FieldCount; i++)
{
txet.Add(reader.GetString(i));
}
}
}
}
catch (Exception e)
{
}
finally
{
reader.Close();
}
return txet;
}/// 匹配的数据
public Dictionary<string, List<string>> SearchMatch(string table,string key,string match)
{
Dictionary<string, List<string>> txet = new Dictionary<string, List<string>>();
if (dbConnection == null)
return txet;
//a可以是N个字符或者汉字
//'%a%' 包含a的
//'%a' 以a结尾的
//'a%' 以a开始的
string sqlSearch = "select * from "+ table+ " WHERE " + key+" LIKE "+ "'%"+ match+ "%'";
MySqlCommand mySqlCommand = new MySqlCommand(sqlSearch, dbConnection);
MySqlDataReader reader = mySqlCommand.ExecuteReader();
try
{
while (reader.Read())//循环表中的所有键
{
if (reader.HasRows)
{
List<string> data = new List<string>();
for (int i = 0; i < reader.FieldCount; i++)
{
data.Add(reader.GetString(i));
}
if (data.Count > 0)
txet.Add(data[0], data);
}
}
}
catch (Exception e)
{
Console.WriteLine("SQL:查询失败了！" + e.Message);
}
finally
{
reader.Close();
}
return txet;
}那么如果是读取表中所有数据的话SQL语句直接把where去掉就可以
8.更新(同时更新多条数据且要修改的值相同)
AND 同时满足多个条件
/// 把AND 改为 OR 就可以赛选满足一项的数据
同时更新(替换 如果不希望替换则使用insert into)多条数据 中的一个字段 值可不同
public DataSet UpdateIntos1(string tableName, string cols, List<string> colsvalues, string selectkey, List<string> selectvalue)
{
string query = "replace into " + tableName + " (" + selectkey + "," + cols + ")";
query += " VALUES (" + selectvalue[0] + ",'" + colsvalues[0] + "')";
for (int i = 1; i < colsvalues.Count; ++i)
{
query += ",(" + selectvalue[i] + ",'" + colsvalues[i] + "')";
}
return ExecuteQuery(query);
}同时更新(替换)多条数据 中的多个个字段 值可不同
public DataSet UpdateIntos2(string tableName, List<string> cols, List<string[]> colsvalues, string selectkey, List<string> selectvalue)
{
string query = "replace into " + tableName + " (" + selectkey + "," + cols[0];
for (int i = 1; i < cols.Count; i++)
{
query += "," + cols[i];
}
query += ")";
query += " VALUES ";
for (int i = 0; i < colsvalues.Count; i++)
{
if (i==0)
query += "(" + selectvalue[i];
else
query += ",(" + selectvalue[i];
string[] values = colsvalues[i];
for (int j = 0; j < values.Length; j++)
{
query += ",'" + values[j] + "'";
}
query += ")";
}
return ExecuteQuery(query);
}最后贴出执行sql语句的方法
public DataSet ExecuteQuery(string sqlString)
{
if (dbConnection==null)
return null;
if (dbConnection.State == ConnectionState.Open)
{
DataSet ds = new DataSet();
try
{
MySqlDataAdapter da = new MySqlDataAdapter(sqlString, dbConnection);
da.Fill(ds);
}
catch (Exception ee)
{
//Console.WriteLine("zheli"+ee.Message);
UnityEngine.Debug.Log("SQL:" + sqlString + "\n" + ee.Message.ToString());
ds = null;
}
finally
{
}
return ds;
}
return null;
}只是贴出了主要语句，很多地方没有详细的去解释，是因为不希望大家只是复制，一定要思考。
这些方法基本上已经满足Mysql的普通使用者，并且很多方法支持高并发，每秒几千条数据是没有问题的。
另外本人也是业余Mysql，如果那里有错误的语法 望指出。谢谢！