public static DbValue NULLIF(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "NULLIF";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
ImmediateValue argval = null;
argval = tools.AllocValue(arg0type.ID);
argval.SetValue(arg0);
DbFunctionArguments compareargs = new DbFunctionArguments(new DbValue[2]);
compareargs[0] = argval;
compareargs[1] = args[1];
DbValue result = COMPARE(tools, compareargs);
int iresult = tools.GetInt(result);
if (iresult == 0)
{
List<byte> buf = tools.AllocBuffer(arg0type.Size);
buf.Add(1);
for (int i = 0; i < arg0type.Size - 1; i++)
{
buf.Add(0);
}
return tools.AllocValue(ByteSlice.Prepare(buf), arg0type);
}
else
{
return args[0];
}
}
public static DbValue REVERSE(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "REVERSE";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
mstring x = tools.GetString(arg0);
mstring r = mstring.Prepare();
for (int i = x.Length - 1; i >= 0; i--)
{
r = r.AppendM(x.SubstringM(i, 1));
}
return(tools.AllocValue(r));
}
public static DbValue INSTR(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "INSTR";
args.EnsureMinCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg1type.Name.ToUpper());
}
int startIndex = 0;
if (args.Length > 2)
{
DbType arg2type;
ByteSlice arg2 = args[2].Eval(out arg2type);
if (arg2type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 0, "input INT, got " + arg2type.Name.ToUpper());
}
if (!Types.IsNullValue(arg2))
{
startIndex = tools.GetInt(arg2);
}
}
mstring sentence = tools.GetString(arg0);
mstring word = tools.GetString(arg1);
int index = -1;
if (startIndex < sentence.Length)
{
if (startIndex > 0)
{
sentence = sentence.SubstringM(startIndex);
}
index = sentence.IndexOf(word);
if (index > -1)
{
index += startIndex;
}
}
return tools.AllocValue(index);
}
public static void DbFunctions_CHARINDEX()
{
DbFunctionTools tools = new DbFunctionTools();
//String,Int32.
{
Console.WriteLine("Testing DbFunctions.CHARINDEX(char(n), char(n)...");
mstring word = mstring.Prepare("apple");
mstring sentence = mstring.Prepare("Red is apple");
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(word));
args.Add(tools.AllocValue(sentence));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.CHARINDEX(tools, fargs);
ByteSlice bs = valOutput.Eval();
int output = tools.GetInt(bs);
int expected = 7;
if (expected != output)
{
throw new Exception("DbFunctions.CHARINDEX(char(n), char(n) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
{
Console.WriteLine("Testing DbFunctions.CHARINDEX(char(n), char(n), Int32...");
mstring word = mstring.Prepare("apple");
mstring sentence = mstring.Prepare("Red is apple, or more apples.");
int startIndex = 8;
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(word));
args.Add(tools.AllocValue(sentence));
args.Add(tools.AllocValue(startIndex));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.CHARINDEX(tools, fargs);
ByteSlice bs = valOutput.Eval();
int output = tools.GetInt(bs);
int expected = 22;
if (expected != output)
{
throw new Exception("DbFunctions.CHARINDEX(char(n), char(n), Int32 has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
public static DbValue CONCAT(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "CONCAT";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg1type.Name.ToUpper());
}
mstring s0 = tools.GetString(arg0);
mstring s1 = tools.GetString(arg1);
s0 = s0.AppendM(s1);
return(tools.AllocValue(s0));
}
public static void DbFunctions_UPPER()
{
DbFunctionTools tools = new DbFunctionTools();
//String,Int32.
{
Console.WriteLine("Testing DbFunctions.UPPER(String)...");
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(mstring.Prepare("hello world")));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.UPPER(tools, fargs);
ByteSlice bs = valOutput.Eval();
mstring output = tools.GetString(bs);
mstring expected = mstring.Prepare("HELLO WORLD");
if (expected != output)
{
throw new Exception("DbFunctions.UPPER(String) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
ByteSlice Conv_IntToDouble(ByteSlice value, int ResultSize, DbFunctionTools tools)
{
int x = tools.GetInt(value);
DbValue v = tools.AllocValue((double)x);
return(v.Eval());
}
public static DbValue ROUND(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ROUND";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.DOUBLE)
{
args.Expected(FunctionName, 0, "input DOUBLE, got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (arg1type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 1, "digits INT, got " + arg1type.Name.ToUpper());
}
int digits = tools.GetInt(arg1);
double x = tools.GetDouble(arg0);
x = Math.Round(x, digits);
return(tools.AllocValue(x));
}
public static DbValue NVL2(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "NVL2";
args.EnsureCount(FunctionName, 3);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
DbType arg2type;
ByteSlice arg2 = args[2].Eval(out arg2type);
if (arg0type.ID != arg1type.ID)
{
args.Expected(FunctionName, 0, "input " + arg0type.Name.ToString() + ", got " + arg1type.Name.ToUpper());
}
if (arg0type.ID != arg2type.ID)
{
args.Expected(FunctionName, 0, "input " + arg0type.Name.ToString() + ", got " + arg2type.Name.ToUpper());
}
if (Types.IsNullValue(arg0))
{
return args[2];
}
else
{
return args[1];
}
}
public static void DbFunctions_NVL2()
{
DbFunctionTools tools = new DbFunctionTools();
{
Console.WriteLine("Testing DbFunctions.NVL2(DateTime)...");
List<DbValue> args = new List<DbValue>();
DateTime dt = DateTime.Parse("12/1/2000 10:00:00 AM");
DateTime ifnull = DateTime.Parse("12/11/2000 10:00:00 AM");
DateTime notnull = DateTime.Parse("12/14/2000 10:00:00 AM");
args.Add(tools.AllocValue(dt));
args.Add(tools.AllocValue(notnull));
args.Add(tools.AllocValue(ifnull));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.NVL2(tools, fargs);
ByteSlice bs = valOutput.Eval();
DateTime output = tools.GetDateTime(bs);
DateTime expected = notnull;
if (expected != output)
{
throw new Exception("DbFunctions.NVL2(DateTime) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
{
Console.WriteLine("Testing DbFunctions.NVL2(DateTime)...");
List<DbValue> args = new List<DbValue>();
byte[] buf = new byte[9];
buf[0] = 1; //is null
DateTime ifnull = DateTime.Parse("12/11/2000 10:00:00 AM");
DateTime notnull = DateTime.Parse("12/14/2000 10:00:00 AM");
args.Add(tools.AllocValue(ByteSlice.Prepare(buf), DbType.Prepare("DateTime", 9)));
args.Add(tools.AllocValue(notnull));
args.Add(tools.AllocValue(ifnull));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.NVL2(tools, fargs);
ByteSlice bs = valOutput.Eval();
DateTime output = tools.GetDateTime(bs);
DateTime expected = ifnull;
if (expected != output)
{
throw new Exception("DbFunctions.NVL2(DateTime) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
public static void DbFunctions_SYSDATE()
{
DbFunctionTools tools = new DbFunctionTools();
//String,Int32.
{
Console.WriteLine("Testing DbFunctions.SYSDATE...");
DbValue valOutput = DbFunctions.SYSDATE(tools, new DbFunctionArguments());
ByteSlice bs = valOutput.Eval();
DateTime output = tools.GetDateTime(bs);
DateTime expected = DateTime.Now;
TimeSpan sp = output - expected;
if (sp.TotalMinutes > 5)
{
throw new Exception("DbFunctions.SYSDATE has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
public static DbValue NVL2(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "NVL2";
args.EnsureCount(FunctionName, 3);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
DbType arg2type;
ByteSlice arg2 = args[2].Eval(out arg2type);
if (arg0type.ID != arg1type.ID)
{
args.Expected(FunctionName, 0, "input " + arg0type.Name.ToString() + ", got " + arg1type.Name.ToUpper());
}
if (arg0type.ID != arg2type.ID)
{
args.Expected(FunctionName, 0, "input " + arg0type.Name.ToString() + ", got " + arg2type.Name.ToUpper());
}
if (Types.IsNullValue(arg0))
{
return(args[2]);
}
else
{
return(args[1]);
}
}
public static DbValue NULLIF(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "NULLIF";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
ImmediateValue argval = null;
argval = tools.AllocValue(arg0type.ID);
argval.SetValue(arg0);
DbFunctionArguments compareargs = new DbFunctionArguments(new DbValue[2]);
compareargs[0] = argval;
compareargs[1] = args[1];
DbValue result = COMPARE(tools, compareargs);
int iresult = tools.GetInt(result);
if (iresult == 0)
{
List <byte> buf = tools.AllocBuffer(arg0type.Size);
buf.Add(1);
for (int i = 0; i < arg0type.Size - 1; i++)
{
buf.Add(0);
}
return(tools.AllocValue(ByteSlice.Prepare(buf), arg0type));
}
else
{
return(args[0]);
}
}
public static DbValue ROUND(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ROUND";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.DOUBLE)
{
args.Expected(FunctionName, 0, "input DOUBLE, got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (arg1type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 1, "digits INT, got " + arg1type.Name.ToUpper());
}
int digits = tools.GetInt(arg1);
double x = tools.GetDouble(arg0);
x = Math.Round(x, digits);
return tools.AllocValue(x);
}
ByteSlice Conv_LongToDouble(ByteSlice value, int ResultSize, DbFunctionTools tools)
{
long x = tools.GetLong(value);
DbValue v = tools.AllocValue((double)x);
return(v.Eval());
}
public static DbValue ADD_MONTHS(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ADD_MONTHS";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 0, "input INT, got " + arg1type.Name.ToUpper());
}
DateTime dt = tools.GetDateTime(arg0);
int months = tools.GetInt(arg1);
dt = dt.AddMonths(months);
return(tools.AllocValue(dt));
}
public static void DbFunctions_RAND()
{
DbFunctionTools tools = new DbFunctionTools();
Random rnd = new Random();
{
Console.WriteLine("Testing DbFunctions.RAND(Int32)...");
int input = rnd.Next(Int32.MinValue, Int32.MaxValue);
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(input));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.RAND(tools, fargs);
ByteSlice bs = valOutput.Eval();
double output = tools.GetDouble(bs);
Console.WriteLine("Expected results received: {0}", output);
}
{
Console.WriteLine("Testing DbFunctions.RAND()...");
List<DbValue> args = new List<DbValue>();
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.RAND(tools, fargs);
ByteSlice bs = valOutput.Eval();
double output = tools.GetDouble(bs);
Console.WriteLine("Expected results received: {0}", output);
}
}
public static DbValue SPACE(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "SPACE";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 0, "input INT, got " + arg0type.Name.ToUpper());
return null;
}
int len = tools.GetInt(arg0);
if (len < 1)
{
return tools.AllocValue(mstring.Prepare(""));
}
else
{
mstring s = mstring.Prepare();
for (int i = 0; i < len; i++)
{
s = s.AppendM(" ");
}
return tools.AllocValue(s);
}
}
public static DbValue ADD_MONTHS(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ADD_MONTHS";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 0, "input INT, got " + arg1type.Name.ToUpper());
}
DateTime dt = tools.GetDateTime(arg0);
int months = tools.GetInt(arg1);
dt = dt.AddMonths(months);
return tools.AllocValue(dt);
}
public static void DbFunctions_RIGHT()
{
DbFunctionTools tools = new DbFunctionTools();
//String,Int32.
{
Console.WriteLine("Testing DbFunctions.RIGHT(String,Int32)...");
mstring input = Utils.GenString(100);
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(input));
args.Add(tools.AllocValue(5));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.RIGHT(tools, fargs);
ByteSlice bs = valOutput.Eval();
mstring output = tools.GetString(bs);
string str = input.ToString();
string expected = str.Substring(str.Length - 5, 5);
if (expected != output.ToString())
{
throw new Exception("DbFunctions.RIGHT(String,Int32) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
public static void DbFunctions_PATINDEX()
{
DbFunctionTools tools = new DbFunctionTools();
//String,Int32.
{
Console.WriteLine("Testing DbFunctions.PATINDEX(String, string)...");
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(mstring.Prepare("%ap_pl[e]%")));
args.Add(tools.AllocValue(mstring.Prepare("red is ap5ple, my favourite.")));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.PATINDEX(tools, fargs);
ByteSlice bs = valOutput.Eval();
int output = tools.GetInt(bs);
int expected = 7;
if (expected != output)
{
throw new Exception("DbFunctions.PATINDEX(String) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
public static void DbFunctions_ADD_MONTHS()
{
DbFunctionTools tools = new DbFunctionTools();
//String,Int32.
{
Console.WriteLine("Testing DbFunctions.ADD_MONTHS...");
List<DbValue> args = new List<DbValue>();
DateTime dt = DateTime.Now;
int months = 9;
args.Add(tools.AllocValue(dt));
args.Add(tools.AllocValue(months));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.ADD_MONTHS(tools, fargs);
ByteSlice bs = valOutput.Eval();
DateTime output = tools.GetDateTime(bs);
DateTime expected = dt.AddMonths(months);
if (expected != output)
{
throw new Exception("DbFunctions.ADD_MONTHS has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
ByteSlice Conv_String(ByteSlice value, int ResultSize, DbFunctionTools tools)
{
mstring x = tools.GetString(value);
x = x.ToUpperM();
DbValue v = tools.AllocValue(x, ResultSize);
return v.Eval();
}
public static DbValue REVERSE(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "REVERSE";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
mstring x = tools.GetString(arg0);
mstring r = mstring.Prepare();
for (int i = x.Length-1; i >= 0; i--)
{
r = r.AppendM(x.SubstringM(i, 1));
}
return tools.AllocValue(r);
}
public static DbValue SUM(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "SUM";
double sumd = 0;
int sumi = 0;
long suml = 0;
DbType arg0type = DbType.PrepareNull();
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (!Types.IsNullValue(arg0)) //ignore null
{
switch (arg0type.ID)
{
case DbTypeID.INT:
sumi += tools.GetInt(arg0);
break;
case DbTypeID.LONG:
suml += tools.GetLong(arg0);
break;
case DbTypeID.DOUBLE:
sumd += tools.GetDouble(arg0);
break;
default:
args[iarg].Expected(AggregatorName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return(null); // Doesn't reach here.
}
}
}
if (args.Length > 0)
{
switch (arg0type.ID)
{
case DbTypeID.INT:
return(tools.AllocValue(sumi));
break;
case DbTypeID.LONG:
return(tools.AllocValue(suml));
break;
case DbTypeID.DOUBLE:
return(tools.AllocValue(sumd));
break;
}
}
return(tools.AllocValue(sumi));
}
ByteSlice Conv_String(ByteSlice value, int ResultSize, DbFunctionTools tools)
{
mstring x = tools.GetString(value);
x = x.ToUpperM();
DbValue v = tools.AllocValue(x, ResultSize);
return(v.Eval());
}
public static DbValue SUBSTRING(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "SUBSTRING";
args.EnsureCount(FunctionName, 3);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
return null;
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (arg1type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 1, "count INT, got " + arg1type.Name.ToUpper());
return null;
}
DbType arg2type;
ByteSlice arg2 = args[2].Eval(out arg2type);
if (arg2type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 1, "count INT, got " + arg2type.Name.ToUpper());
return null;
}
mstring x = tools.GetString(arg0);
int startIndex = tools.GetInt(arg1);
if (startIndex < 0)
{
startIndex = 0;
}
int len = tools.GetInt(arg2);
if (len < 0)
{
throw new ArgumentException(FunctionName + " length cannot be negative");
}
if (startIndex + len > x.Length)
{
return tools.AllocValue(mstring.Prepare());
}
else
{
mstring sub = x.SubstringM(startIndex, len);
return tools.AllocValue(sub);
}
}
public static DbValue ExecDbScalarFunction(string name, DbFunctionTools tools, DbFunctionArguments args)
{
DbValue result = TryExecDbScalarFunction(name, tools, args);
if (null == result)
{
throw new DbExecException("No such scalar function named '" + name + "'");
}
return(result);
}
public static DbValue ExecDbAggregator(string name, DbFunctionTools tools, DbAggregatorArguments args)
{
DbValue result = TryExecDbAggregator(name, tools, args);
if (null == result)
{
throw new DbExecException("No such aggregate function named '" + name + "'");
}
return(result);
}
public static DbValue SUM(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "SUM";
double sumd = 0;
int sumi = 0;
long suml = 0;
DbType arg0type = DbType.PrepareNull();
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (!Types.IsNullValue(arg0)) //ignore null
{
switch (arg0type.ID)
{
case DbTypeID.INT:
sumi += tools.GetInt(arg0);
break;
case DbTypeID.LONG:
suml += tools.GetLong(arg0);
break;
case DbTypeID.DOUBLE:
sumd += tools.GetDouble(arg0);
break;
default:
args[iarg].Expected(AggregatorName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return null; // Doesn't reach here.
}
}
}
if (args.Length > 0)
{
switch (arg0type.ID)
{
case DbTypeID.INT:
return tools.AllocValue(sumi);
break;
case DbTypeID.LONG:
return tools.AllocValue(suml);
break;
case DbTypeID.DOUBLE:
return tools.AllocValue(sumd);
break;
}
}
return tools.AllocValue(sumi);
}
public static void DbFunctions_INSTR()
{
DbFunctionTools tools = new DbFunctionTools();
{
Console.WriteLine("Testing DbFunctions.SUBSTR(String,String)...");
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(mstring.Prepare("apple is red")));
args.Add(tools.AllocValue(mstring.Prepare("red")));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.INSTR(tools, fargs);
ByteSlice bs = valOutput.Eval();
int output = tools.GetInt(bs);
int expected = 9;
if (expected != output)
{
throw new Exception("DbFunctions.SUBSTR(String,String) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
{
Console.WriteLine("Testing DbFunctions.SUBSTR(String,String, Int32)...");
List<DbValue> args = new List<DbValue>();
args.Add(tools.AllocValue(mstring.Prepare("apple is red")));
args.Add(tools.AllocValue(mstring.Prepare("red")));
int startindex = 2;
args.Add(tools.AllocValue(startindex));
DbFunctionArguments fargs = new DbFunctionArguments(args);
DbValue valOutput = DbFunctions.INSTR(tools, fargs);
ByteSlice bs = valOutput.Eval();
int output = tools.GetInt(bs);
int expected = 9;
if (expected != output)
{
throw new Exception("DbFunctions.SUBSTR(String,String, Int32) has failed. Expected result: " + expected.ToString() + ", but received: " + output.ToString());
}
else
{
Console.WriteLine("Expected results received.");
}
}
}
private static DbValue _BITWISE(string aggregatorName, DbFunctionTools tools, DbAggregatorArguments args, int whatop)
{
if (args.Length == 0)
{
return(tools.AllocNullValue());
}
DbType arg0type = DbType.PrepareNull();
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(aggregatorName, 1);
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue());
}
if (bitopbuf == null || bitopbuf.Length != arg0type.Size)
{
bitopbuf = new byte[arg0type.Size];
}
if (iarg == 0)
{
for (int ib = 0; ib < arg0.Length; ib++)
{
bitopbuf[ib] = arg0[ib];
}
continue;
}
for (int ib = 1; ib < arg0.Length; ib++)
{
switch (whatop)
{
case 1:
bitopbuf[ib] = (byte)(bitopbuf[ib] & arg0[ib]);
break;
case 2:
bitopbuf[ib] = (byte)(bitopbuf[ib] | arg0[ib]);
break;
default:
bitopbuf[ib] = (byte)(bitopbuf[ib] ^ arg0[ib]);
break;
}
}
}
ByteSlice bs = ByteSlice.Prepare(bitopbuf);
return(tools.AllocValue(bs, arg0type));
}
public static DbValue ISNULL(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ISNULL";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
bool bresult = Types.IsNullValue(arg0);
return tools.AllocValue(bresult ? 1 : 0);
}
public static DbValue LESSEREQUAL(DbFunctionTools tools, DbFunctionArguments args)
{
DbValue dbvcompare = COMPARE(tools, args);
DbType typecompare;
ByteSlice bsresult = dbvcompare.Eval(out typecompare);
if (DbTypeID.INT != typecompare.ID)
{
return tools.AllocValue(bsresult, typecompare);
}
int compare = tools.GetInt(bsresult);
return tools.AllocValue(compare <= 0 ? 1 : 0);
}
public static DbValue ISNULL(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ISNULL";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
bool bresult = Types.IsNullValue(arg0);
return(tools.AllocValue(bresult ? 1 : 0));
}
// Returns null if no such function.
public static DbValue TryExecDbAggregator(string name, DbFunctionTools tools, DbAggregatorArguments args)
{
EnsureDbAggregators();
if (!DbAggregatorExists(name))
{
return(null);
}
DbAggregatorDelegate dbagg = dbaggregators[name];
return(dbagg(tools, args));
}
// Returns null if no such function.
public static DbValue TryExecDbScalarFunction(string name, DbFunctionTools tools, DbFunctionArguments args)
{
EnsureDbFunctions();
if (!DbScalarFunctionExists(name))
{
return(null);
}
DbScalarFunctionDelegate dbf = dbscalarfuncs[name];
return(dbf(tools, args));
}
public static DbValue MONTHS_BETWEEN(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "MONTHS_BETWEEN";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg1type.Name.ToUpper());
}
DateTime dt0 = tools.GetDateTime(arg0);
DateTime dt1 = tools.GetDateTime(arg1);
int daysInMonth0 = DateTime.DaysInMonth(dt0.Year, dt0.Month);
int daysInMonth1 = DateTime.DaysInMonth(dt1.Year, dt1.Month);
double btw = 0;
if (dt0.Year == dt1.Year && dt0.Month == dt1.Month) //same month and same year
{
btw = (double)(dt0.Day - dt1.Day) / (double)daysInMonth0;
}
else if (dt0.Day == daysInMonth0 && dt1.Day == daysInMonth1) //both fall on the last day of their months
{
btw = 12 * (dt0.Year - dt1.Year) + dt0.Month - dt1.Month;
}
else
{
TimeSpan sp = dt0 - dt1;
btw = sp.TotalDays / 31d;
}
return(tools.AllocValue(btw));
}
private static DbValue _BITWISE(string aggregatorName, DbFunctionTools tools, DbAggregatorArguments args, int whatop)
{
if (args.Length == 0)
{
return tools.AllocNullValue();
}
DbType arg0type = DbType.PrepareNull();
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(aggregatorName, 1);
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue();
}
if (bitopbuf == null || bitopbuf.Length != arg0type.Size)
{
bitopbuf = new byte[arg0type.Size];
}
if (iarg == 0)
{
for (int ib = 0; ib < arg0.Length; ib++)
{
bitopbuf[ib] = arg0[ib];
}
continue;
}
for (int ib = 1; ib < arg0.Length; ib++)
{
switch (whatop)
{
case 1:
bitopbuf[ib] = (byte)(bitopbuf[ib] & arg0[ib]);
break;
case 2:
bitopbuf[ib] = (byte)(bitopbuf[ib] | arg0[ib]);
break;
default:
bitopbuf[ib] = (byte)(bitopbuf[ib] ^ arg0[ib]);
break;
}
}
}
ByteSlice bs = ByteSlice.Prepare(bitopbuf);
return tools.AllocValue(bs, arg0type);
}
public static DbValue LESSEREQUAL(DbFunctionTools tools, DbFunctionArguments args)
{
DbValue dbvcompare = COMPARE(tools, args);
DbType typecompare;
ByteSlice bsresult = dbvcompare.Eval(out typecompare);
if (DbTypeID.INT != typecompare.ID)
{
return(tools.AllocValue(bsresult, typecompare));
}
int compare = tools.GetInt(bsresult);
return(tools.AllocValue(compare <= 0 ? 1 : 0));
}
public static DbValue FIRST(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "FIRST";
if (args.Length > 0)
{
args[0].EnsureCount(AggregatorName, 1);
return(args[0][0]);
}
else
{
return(tools.AllocNullValue());
}
}
public static DbValue FIRST(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "FIRST";
if (args.Length > 0)
{
args[0].EnsureCount(AggregatorName, 1);
return args[0][0];
}
else
{
return tools.AllocNullValue();
}
}
public static DbValue MONTHS_BETWEEN(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "MONTHS_BETWEEN";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.DATETIME)
{
args.Expected(FunctionName, 0, "input DATETIME, got " + arg1type.Name.ToUpper());
}
DateTime dt0 = tools.GetDateTime(arg0);
DateTime dt1 = tools.GetDateTime(arg1);
int daysInMonth0 = DateTime.DaysInMonth(dt0.Year, dt0.Month);
int daysInMonth1 = DateTime.DaysInMonth(dt1.Year, dt1.Month);
double btw = 0;
if (dt0.Year == dt1.Year && dt0.Month == dt1.Month) //same month and same year
{
btw = (double)(dt0.Day - dt1.Day) / (double)daysInMonth0;
}
else if (dt0.Day == daysInMonth0 && dt1.Day == daysInMonth1) //both fall on the last day of their months
{
btw = 12 * (dt0.Year - dt1.Year) + dt0.Month - dt1.Month;
}
else
{
TimeSpan sp = dt0 - dt1;
btw = sp.TotalDays / 31d;
}
return tools.AllocValue(btw);
}
public static DbValue LAST(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "LAST";
if (args.Length > 0)
{
int lastindex = args.Length - 1;
args[lastindex].EnsureCount(AggregatorName, 1);
return(args[lastindex][0]);
}
else
{
return(tools.AllocNullValue());
}
}
public static DbValue LAST(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "LAST";
if (args.Length > 0)
{
int lastindex = args.Length - 1;
args[lastindex].EnsureCount(AggregatorName, 1);
return args[lastindex][0];
}
else
{
return tools.AllocNullValue();
}
}
private static double _VAR(string aggregatorName, DbFunctionTools tools, DbAggregatorArguments args, bool sample)
{
List <double> values = new List <double>();
double x = 0;
double sum = 0;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(aggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (!Types.IsNullValue(arg0)) //ignore null
{
switch (arg0type.ID)
{
case DbTypeID.INT:
x = (double)tools.GetInt(arg0);
break;
case DbTypeID.LONG:
x = (double)tools.GetLong(arg0);
break;
case DbTypeID.DOUBLE:
x = tools.GetDouble(arg0);
break;
default:
args[iarg].Expected(aggregatorName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return(0); // Doesn't reach here.
}
values.Add(x);
sum += x;
}
}
double dev = 0;
if (values.Count > 0)
{
double avg = sum / (double)values.Count;
for (int i = 0; i < values.Count; i++)
{
dev += Math.Pow(values[i] - avg, 2);
}
dev = dev / (double)(sample ? values.Count - 1 : values.Count);
}
return(dev);
}
public static DbValue DEGREES(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "DEGREES";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
double d = 0;
switch (arg0type.ID)
{
case DbTypeID.INT:
{
int x = tools.GetInt(arg0);
d = (double)x;
}
break;
case DbTypeID.LONG:
{
long x = tools.GetLong(arg0);
d = (double)x;
}
break;
case DbTypeID.DOUBLE:
{
d = tools.GetDouble(arg0);
}
break;
default:
args.Expected(FunctionName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return(null); // Doesn't reach here.
}
double r = (d * 180d) / Math.PI;
return(tools.AllocValue(r));
}
public static DbValue REPLACE(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "REPLACE";
args.EnsureCount(FunctionName, 3);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg1))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg1type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg1type.Name.ToUpper());
}
DbType arg2type;
ByteSlice arg2 = args[2].Eval(out arg2type);
if (Types.IsNullValue(arg2))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg2type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg2type.Name.ToUpper());
}
mstring sentence = tools.GetString(arg0);
mstring word = tools.GetString(arg1);
mstring replacement = tools.GetString(arg2);
sentence = sentence.ReplaceM(ref word, ref replacement);
return(tools.AllocValue(sentence));
}
public static DbValue MAX(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "MAX";
DbValue highest = null;
DbValue nullest = null;
DbFunctionArguments compareargs = new DbFunctionArguments(new DbValue[2]);
ImmediateValue argval = null;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
if (null == nullest)
{
nullest = tools.AllocValue(arg0, arg0type);
}
}
else
{
if (null == argval)
{
argval = tools.AllocValue(arg0type.ID);
}
argval.SetValue(arg0);
compareargs[0] = argval;
compareargs[1] = highest;
if (null == highest || tools.GetInt(DbFunctions.COMPARE(tools, compareargs)) > 0)
{
highest = argval; // Keep this one.
argval = null; // New one next time.
}
}
}
if (null == highest)
{
if (null == nullest)
{
return(tools.AllocNullValue());
}
return(nullest);
}
return(highest);
}
public static DbValue MAX(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "MAX";
DbValue highest = null;
DbValue nullest = null;
DbFunctionArguments compareargs = new DbFunctionArguments(new DbValue[2]);
ImmediateValue argval = null;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
if (null == nullest)
{
nullest = tools.AllocValue(arg0, arg0type);
}
}
else
{
if (null == argval)
{
argval = tools.AllocValue(arg0type.ID);
}
argval.SetValue(arg0);
compareargs[0] = argval;
compareargs[1] = highest;
if (null == highest || tools.GetInt(DbFunctions.COMPARE(tools, compareargs)) > 0)
{
highest = argval; // Keep this one.
argval = null; // New one next time.
}
}
}
if (null == highest)
{
if (null == nullest)
{
return tools.AllocNullValue();
}
return nullest;
}
return highest;
}
public static DbValue CHOOSERND(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "CHOOSERND";
if (args.Length == 0)
{
return tools.AllocNullValue();
}
if (anyRnd == -1)
{
Random rnd = new Random(System.DateTime.Now.Millisecond / 2 + System.Diagnostics.Process.GetCurrentProcess().Id / 2);
anyRnd = rnd.Next();
}
int index = anyRnd % args.Length;
args[index].EnsureCount(AggregatorName, 1);
return args[index][0];
}
private static double _VAR(string aggregatorName, DbFunctionTools tools, DbAggregatorArguments args, bool sample)
{
List<double> values = new List<double>();
double x = 0;
double sum = 0;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(aggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (!Types.IsNullValue(arg0)) //ignore null
{
switch (arg0type.ID)
{
case DbTypeID.INT:
x = (double)tools.GetInt(arg0);
break;
case DbTypeID.LONG:
x = (double)tools.GetLong(arg0);
break;
case DbTypeID.DOUBLE:
x = tools.GetDouble(arg0);
break;
default:
args[iarg].Expected(aggregatorName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return 0; // Doesn't reach here.
}
values.Add(x);
sum += x;
}
}
double dev = 0;
if (values.Count > 0)
{
double avg = sum / (double)values.Count;
for (int i = 0; i < values.Count; i++)
{
dev += Math.Pow(values[i] - avg, 2);
}
dev = dev / (double)(sample ? values.Count - 1 : values.Count);
}
return dev;
}
public static DbValue ABS(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ABS";
args.EnsureCount(FunctionName, 1);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return tools.AllocNullValue(); // Give a null, take a null.
}
switch (arg0type.ID)
{
case DbTypeID.INT:
{
int x = tools.GetInt(arg0);
x = Math.Abs(x);
return tools.AllocValue(x);
}
break;
case DbTypeID.LONG:
{
long x = tools.GetLong(arg0);
x = Math.Abs(x);
return tools.AllocValue(x);
}
break;
case DbTypeID.DOUBLE:
{
double x = tools.GetDouble(arg0);
x = Math.Abs(x);
return tools.AllocValue(x);
}
break;
default:
args.Expected(FunctionName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return null; // Doesn't reach here.
}
}
public static DbValue CHOOSERND(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "CHOOSERND";
if (args.Length == 0)
{
return(tools.AllocNullValue());
}
if (anyRnd == -1)
{
Random rnd = new Random(System.DateTime.Now.Millisecond / 2 + System.Diagnostics.Process.GetCurrentProcess().Id / 2);
anyRnd = rnd.Next();
}
int index = anyRnd % args.Length;
args[index].EnsureCount(AggregatorName, 1);
return(args[index][0]);
}
public static DbValue COUNT(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "COUNT";
long count = 0;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (Types.IsNullValue(arg0)) //ignore null
{
continue;
}
count++;
}
return tools.AllocValue(count);
}
public static DbValue LEFT(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "LEFT";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (arg1type.ID != DbTypeID.INT)
{
args.Expected(FunctionName, 1, "count INT, got " + arg1type.Name.ToUpper());
}
mstring x = tools.GetString(arg0);
int LeftCount = tools.GetInt(arg1);
if (LeftCount >= x.Length)
{
// User requested the whole string.
return(tools.AllocValue(arg0, arg0type));
}
else if (LeftCount < 0)
{
throw new ArgumentException(FunctionName + " count cannot be negative");
}
else
{
x = x.SubstringM(0, LeftCount);
return(tools.AllocValue(x));
}
}
public static DbValue COUNT(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "COUNT";
long count = 0;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (Types.IsNullValue(arg0)) //ignore null
{
continue;
}
count++;
}
return(tools.AllocValue(count));
}
public static DbValue AVG(DbFunctionTools tools, DbAggregatorArguments args)
{
string AggregatorName = "AVG";
double sum = 0;
int count = 0;
for (int iarg = 0; iarg < args.Length; iarg++)
{
args[iarg].EnsureCount(AggregatorName, 1);
DbType arg0type;
ByteSlice arg0 = args[iarg][0].Eval(out arg0type);
if (!Types.IsNullValue(arg0)) //ignore null
{
count++;
switch (arg0type.ID)
{
case DbTypeID.INT:
sum += (double)tools.GetInt(arg0);
break;
case DbTypeID.LONG:
sum += (double)tools.GetLong(arg0);
break;
case DbTypeID.DOUBLE:
sum += tools.GetDouble(arg0);
break;
default:
args[iarg].Expected(AggregatorName, 0, "input INT, LONG or DOUBLE, got " + arg0type.Name.ToUpper());
return(null); // Doesn't reach here.
}
}
}
double avg = 0;
if (count > 0)
{
avg = sum / (double)count;
}
return(tools.AllocValue(avg));
}
public static DbValue PATINDEX(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "PATINDEX";
args.EnsureCount(FunctionName, 2);
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocNullValue()); // Give a null, take a null.
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
if (arg1type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg1type.Name.ToUpper());
}
string pat = tools.GetString(arg0).ToString();
string str = tools.GetString(arg1).ToString();
pat = pat.Trim('%');
string rpat = GetRegexString(pat);
System.Text.RegularExpressions.Regex regx = new System.Text.RegularExpressions.Regex(rpat);
System.Text.RegularExpressions.Match match = regx.Match(str);
int indx = -1;
if (match != null)
{
indx = match.Index;
}
return(tools.AllocValue(indx));
}
public static DbValue ISLIKE(DbFunctionTools tools, DbFunctionArguments args)
{
string FunctionName = "ISLIKE";
args.EnsureCount(FunctionName, 2);
int ismatch = 0;
DbType arg0type;
ByteSlice arg0 = args[0].Eval(out arg0type);
if (Types.IsNullValue(arg0))
{
return(tools.AllocValue(ismatch));
}
if (arg0type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 0, "input CHAR(n), got " + arg0type.Name.ToUpper());
}
DbType arg1type;
ByteSlice arg1 = args[1].Eval(out arg1type);
if (arg1type.ID != DbTypeID.CHARS)
{
args.Expected(FunctionName, 1, "pattern CHAR(n), got " + arg1type.Name.ToUpper());
}
string x = tools.GetString(arg0).ToString();
string y = tools.GetString(arg1).ToString();
string pattern = GetRegexString(y);
if (pattern != null)
{
System.Text.RegularExpressions.Regex regx = new System.Text.RegularExpressions.Regex(pattern, System.Text.RegularExpressions.RegexOptions.IgnoreCase);
if (regx.IsMatch(x))
{
ismatch = 1;
}
}
return(tools.AllocValue(ismatch));
}
