/// <summary>
/// Build Sql command and parameters from the shorthand fluent syntax
/// </summary>
/// <remarks>
/// //Example query with multiple blocks
/// cmd.BuildSelect(builder =>
/// {
/// builder.Limit = 100;
/// builder.Select("T1.*").From("dbo", "TBL_USER", "T1");
///
/// builder.WhereBlockBegin(WhereClauseType.Or)
/// .AndWhere("T1.FIRSTNAME = ?FN1", new MySqlParameter("FN1", "Adam"))
/// .AndWhere("T1.FIRSTNAME != ?FN2", new MySqlParameter("FN2", "Amber"))
/// .WhereBlockEnd();
///
/// builder.WhereBlockBegin(WhereClauseType.Or)
/// .AndWhere("T1.LASTNAME = ?LN1", new MySqlParameter("LN1", "Adamson"))
/// .AndWhere("T1.LASTNAME != ?LN2", new MySqlParameter("LN2", "Amberman"))
/// .WhereBlockEnd();
///
/// builder.OrderByAsc("T1.LASTNAME")
/// .OrderByDesc("T1.FIRSTNAME");
/// builder.GroupBy("T1.FIRSTNAME");
/// builder.Having("T1.SCORE > ?SCORE", new MySqlParameter("SCORE", 12_000));
///});
/// </remarks>
public static MySqlCommand BuildSelect(this MySqlCrudQueryExecutionContext ctx,
MySqlCommand command,
Action <MySqlSelectBuilder> body)
{
command.NonNull(nameof(command));
body.NonNull(nameof(body));
using (var builder = MySqlSelectBuilder.For(ctx.DataStore.SchemaName.NonBlank("schema-name")))
{
body(builder);
builder.Build(command);
}
return(command);
}
/// <summary>
/// Provides a clean instance of the builder for the specified schema.
/// You should dispose this instance once done using .Dispose() call which returns
/// it to the internal cache pool. Use the 'using(var builder = MySelectBuilder.For("schema"){ }' pattern
/// </summary>
public static MySqlSelectBuilder For(string schemaName)
{
var instance =
Interlocked.Exchange(ref s_Cache1, null) ??
Interlocked.Exchange(ref s_Cache2, null) ??
Interlocked.Exchange(ref s_Cache3, null) ??
Interlocked.Exchange(ref s_Cache4, null) ??
Interlocked.Exchange(ref s_Cache5, null);
if (instance == null)
{
instance = new MySqlSelectBuilder();
}
instance.m_SchemaName = schemaName;
return(instance);
}
