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using System;
using System.Collections.Generic;
using System.Data;
using System.Threading.Tasks;
using System.Linq;
namespace DirectSQL
{
/// <summary>
/// Execute a sql with a connection and a transaction.
/// </summary>
/// <param name="connection">a connection</param>
/// <param name="transaction">a transaction</param>
/// <typeparam name="C">Type of Connection</typeparam>
/// <typeparam name="T">Type of Transaction</typeparam>
public delegate void SqlExecution<C,T>(C connection, T transaction) where C:IDbConnection where T : IDbTransaction;
/// <summary>
/// Execute a sql asynchronously with a connection and a transaction.
/// </summary>
/// <param name="connection">a connection</param>
/// <param name="transaction">a transaction</param>
/// <typeparam name="C">Type of Connection</typeparam>
/// <typeparam name="T">Type of Transaction</typeparam>
/// <returns>Task of asynchronous process</returns>
public delegate Task AsyncSqlExecution<C,T>(C connection, T transaction) where C : IDbConnection where T : IDbTransaction;
/// <summary>
/// Do something with a connection
/// </summary>
/// <param name="connection">a connection</param>
/// <typeparam name="C">Type of Connection</typeparam>
public delegate void ConnectExecution<C>(C connection) where C : IDbConnection;
/// <summary>
/// Do something asynchronously with a connection.
/// </summary>
/// <param name="connection">a connection</param>
/// <typeparam name="C">Type of Connection</typeparam>
/// <returns>Task of asynchronous process</returns>
public delegate Task AsyncConnectExecution<C>(C connection) where C : IDbConnection;
/// <summary>
/// Read sql result.
/// </summary>
/// <param name="result">result to be read</param>
/// <typeparam name="R">Type of DataReader</typeparam>
/// <typeparam name="CMD">Type of DbCommand</typeparam>
/// <typeparam name="T">Type of Transaction</typeparam>
/// <typeparam name="C">Type of Connection</typeparam>
/// <typeparam name="P">Type of DataParameter</typeparam>
public delegate void ReadSqlResult<R,CMD,T,C,P>(SqlResult<R,CMD,T,C,P> result) where CMD : IDbCommand where R : IDataReader where T : IDbTransaction where C : IDbConnection where P:IDataParameter,new();
/// <summary>
/// Database class is entry point of DirectSQL library.
/// </summary>
/// <typeparam name="C">Type of Connection</typeparam>
/// <typeparam name="T">Type of Transaction</typeparam>
/// <typeparam name="CMD">Type of DbCommand</typeparam>
/// <typeparam name="R">Type of DataReader</typeparam>
/// <typeparam name="P">Type of DataParameter</typeparam>
public abstract class Database<C,T,CMD,R,P> where C : IDbConnection where T : IDbTransaction where CMD : IDbCommand where R : IDataReader where P:IDataParameter,new()
{
/// <summary>
/// Asynchronous process with a connection
/// </summary>
/// <param name="execute">execution with a connection</param>
/// <returns></returns>
public async Task ProcessAsync(AsyncConnectExecution<C> execute)
{
using (var connection = CreateConnection())
{
connection.Open();
await execute(connection);
}
}
/// <summary>
/// Asynchronous process with a connection and a transaction
/// </summary>
/// <param name="execute">execution with a connection and a transaction</param>
/// <returns></returns>
public async Task ProcessAsync(AsyncSqlExecution<C,T> execute)
{
await ProcessAsync(async (connection) =>
{
await TransactionAsync(connection, execute);
});
}
/// <summary>
/// Synchronous process with a connection
/// </summary>
/// <param name="execute">execution with a connection</param>
public void Process(ConnectExecution<C> execute)
{
using (var connection = CreateConnection())
{
connection.Open();
execute(connection);
}
}
/// <summary>
/// Synchronous process with a connection and a transaction
/// </summary>
/// <param name="execute">execution with a connection and a transaction</param>
public void Process(SqlExecution<C,T> execute)
{
Process((connection) =>
{
Transaction(connection, execute);
});
}
/// <summary>
/// Sub class implements actual method to create a connection.
/// </summary>
/// <returns></returns>
protected abstract C CreateConnection();
/// <summary>
/// Execute a sql like update / insert
/// </summary>
/// <param name="sql">sql to execute</param>
/// <param name="parameters">parameter values bound to sql</param>
/// <param name="connection">connection to execute sql</param>
/// <param name="transaction">transaction to execute sql</param>
/// <returns>affected row count</returns>
public static int ExecuteNonQuery(
string sql,
(String name, object value)[] parameters,
C connection,
T transaction)
{
using( var command = (CMD) connection.CreateCommand())
{
command.Transaction = transaction;
command.CommandText = sql;
SetParameters(command, parameters);
return command.ExecuteNonQuery();
}
}
/// <summary>
/// Execute a sql like update / insert
/// </summary>
/// <param name="sql">sql to execute</param>
/// <param name="connection">connection to execute sql</param>
/// <param name="transaction">transaction to execute sql</param>
/// <returns>affected row count</returns>
public static int ExecuteNonQuery(
string sql,
C connection,
T transaction)
{
return ExecuteNonQuery(sql, new ValueTuple<String, object>[0], connection, transaction);
}
/// <summary>
/// Execute a sql like update / insert
/// </summary>
/// <remarks>
/// Formattable string is handled as sql with bind parameters
/// </remarks>
/// <param name="sql">sql to execute in formattable string</param>
/// <param name="connection">connection to execute sql</param>
/// <param name="transaction">transaction to execute sql</param>
/// <returns>affected row count</returns>
public static int ExecuteFormattableNonQuery(
FormattableString sql,
C connection,
T transaction)
{
var sqlAndParams = ExtractSqlAndParam(sql);
return ExecuteNonQuery(
sqlAndParams.sql,
sqlAndParams.parameters,
connection,
transaction);
}
/// <summary>
/// Execute a sql and get a scalar.
/// </summary>
/// <param name="sql">sql to execute</param>
/// <param name="connection">connection to execute sql</param>
/// <param name="transaction">transaction to execute sql</param>
/// <returns>result of sql</returns>
public static object ExecuteScalar(
string sql,
C connection,
T transaction)
{
return ExecuteScalar(sql, new ValueTuple<String, object>[0], connection, transaction);
}
/// <summary>
/// Execute a sql and get a scalar.
/// </summary>
/// <param name="sql">sql to execute</param>
/// <param name="parameters">parameter values bound to sql</param>
/// <param name="connection">connection to execute sql</param>
/// <param name="transaction">transaction to execute sql</param>
/// <returns>result of sql</returns>
public static object ExecuteScalar(
string sql,
(String name, object value)[] parameters,
C connection,
T transaction)
{
using (var command = (CMD) connection.CreateCommand())
{
command.Transaction = transaction;
command.CommandText = sql;
SetParameters(command, parameters);
return command.ExecuteScalar();
}
}
/// <summary>
/// Execute a sql and get a scalar.
/// </summary>
/// <param name="sql">sql to execute</param>
/// <param name="connection">connection to execute sql</param>
/// <param name="transaction">transaction to execute sql</param>
/// <returns>result of sql</returns>
public static object ExecuteFormattableScalar(
FormattableString sql,
C connection,
T transaction)
{
var extracted = ExtractSqlAndParam(sql);
return ExecuteScalar(extracted.sql, extracted.parameters, connection, transaction);
}
/// <summary>
/// Execute a sql to query
/// </summary>
/// <param name="sql">a sql to query</param>
/// <param name="parameters">parameter values bound to sql</param>
/// <param name="connection">a connection to execute sql</param>
/// <param name="transaction">a transaction to execute sql</param>
/// <param name="readResult">function to read result of sql</param>
public static void Query(
string sql,
(String name, object value)[] parameters,
C connection,
T transaction,
ReadSqlResult<R,CMD,T,C,P> readResult)
{
using (var result = new SqlResult<R,CMD,T,C,P>(sql,parameters,connection,transaction))
{
result.Init();
readResult(result);
}
}
/// <summary>
/// Execute a sql to query
/// </summary>
/// <param name="sql">a sql to query</param>
/// <param name="connection">a connection to execute sql</param>
/// <param name="transaction">a transaction to execute sql</param>
/// <param name="readResult">function to read result of sql</param>
public static void Query(
string sql,
C connection,
T transaction,
ReadSqlResult<R,CMD,T,C,P> readResult)
{
Query(sql, new (String,object)[0],connection,transaction, readResult);
}
/// <summary>
/// Execute a sql to query
/// </summary>
/// <param name="sql">a sql to query</param>
/// <param name="connection">a connection to execute sql</param>
/// <param name="transaction">a transaction to execute sql</param>
/// <param name="readResult">function to read result of sql</param>
public static void QueryFormattable(
FormattableString sql,
C connection,
T transaction,
ReadSqlResult<R,CMD,T,C,P> readResult)
{
var extracted = ExtractSqlAndParam(sql);
Query(extracted.sql, extracted.parameters, connection, transaction, readResult);
}
/// <summary>
/// Bind parameters to a command of sql
/// </summary>
/// <param name="command">command of sql</param>
/// <param name="parameters">parameter values bound to sql</param>
internal static void SetParameters(CMD command, (String name,object value)[] parameters)
{
for (int i = 0; i < parameters.Length; i ++)
{
P parameter = (P) command.CreateParameter();
parameter.ParameterName = parameters[i].name;
parameter.Value = parameters[i].value;
command.Parameters.Add(parameter);
}
}
/// <summary>
/// Execute in a transaction.
/// </summary>
/// <param name="connection">connection to be used</param>
/// <param name="execute">to be executed</param>
public static void Transaction(C connection, SqlExecution<C,T> execute)
{
using(var transaction = (T) connection.BeginTransaction())
{
try
{
execute(connection, transaction);
}
catch( Exception exception )
{
transaction.Rollback();
throw new DatabaseException( MessageResource.msg_error_sqlExecutionError, exception );
}
}
}
/// <summary>
/// Execute in a transaction asynchronously.
/// </summary>
/// <param name="connection">connection to be used</param>
/// <param name="execute">to be executed</param>
/// <returns>A task stands for asynchronous execution</returns>
public static async Task TransactionAsync(C connection, AsyncSqlExecution<C,T> execute)
{
using (var transaction = (T) connection.BeginTransaction())
{
try
{
await execute(connection, transaction);
}
catch (Exception exception)
{
transaction.Rollback();
throw new DatabaseException(MessageResource.msg_error_sqlExecutionError, exception);
}
}
}
private static(String sql, (String,Object)[] parameters) ExtractSqlAndParam(FormattableString sqlFormattableString)
{
var paramNames =
Enumerable.Range(0, sqlFormattableString.ArgumentCount)
.Select(index => $"@{index}")
.ToArray();
return (String.Format(sqlFormattableString.Format, paramNames), //select * from TBL where COL = @1
Enumerable.Range(0, sqlFormattableString.ArgumentCount)
.Select((index) =>
(paramNames[index],sqlFormattableString.GetArgument(index))
)
.ToArray() // { ("@1",value1) }
);
}
public static P CreateParameter(string name, object value)
{
return new P() { ParameterName = name, Value = value };
}
public static dynamic[] LoadSqlResult(
String sql,
(String,object)[] parameters,
C connection,
T transaction)
{
return SqlResult.LoadSqlResult(sql, parameters, connection, transaction);
}
public static dynamic[] LoadSqlResult(
String sql,
C connection,
T transaction)
{
return SqlResult.LoadSqlResult(sql, connection, transaction);
}
public static dynamic[] LoadFormattableSqlResult(
FormattableString sql,
C connection,
T transaction)
{
var extracted = ExtractSqlAndParam(sql);
return SqlResult.LoadSqlResult(
extracted.sql,
extracted.parameters,
connection,
transaction);
}
public static async Task<dynamic[]> LoadSqlResultAsync(
String sql,
(String, object)[] parameters,
C connection,
T transaction)
{
return await SqlResult.LoadSqlResultAsync(
sql,
parameters,
connection,
transaction);
}
public static async Task<dynamic[]> LoadSqlResultAsync(
String sql,
C connection,
T transaction)
{
return await SqlResult.LoadSqlResultAsync(
sql,
connection,
transaction);
}
public static async Task<dynamic[]> LoadFormattableSqlResultAsync(
FormattableString sql,
C connection,
T transaction)
{
var extracted = ExtractSqlAndParam(sql);
return await SqlResult.LoadSqlResultAsync(
extracted.sql,
extracted.parameters,
connection,
transaction);
}
public class SqlResult: DirectSQL.SqlResult<R,CMD,T,C,P>
{
internal SqlResult(
String sql,
(String name, object value)[] parameters,
C connection,
T transaction) : base( sql, parameters, connection, transaction )
{
}
}
}
}