internal ComBuffer(Connection.CLICommand cmd, int id)
{
int size = 12;
buf = new byte[size];
pos = 0;
putInt(size);
putInt((int)cmd);
putInt(id);
}
internal object getObject(Connection.CLICommand cmd, int n)
{
if (stmt == null) {
throw new CliError("ObjectSet was aleady closed");
}
if (stmt.con == null) {
throw new CliError("Statement was closed");
}
ComBuffer buf = new ComBuffer(cmd, stmt.stmtId);
if (cmd == Connection.CLICommand.cli_cmd_skip) {
buf.putInt(n);
}
stmt.con.send(buf);
buf.reset(4);
stmt.con.receive(buf, 4);
int len = buf.getInt();
if (len == (int)Connection.CLIStatus.cli_not_found) {
return null;
} else if (len <= 0) {
throw new CliError("Failed to get object");
}
buf.reset(len-4);
stmt.con.receive(buf, len-4);
currOid = buf.getInt();
if (currOid == 0) {
return null;
}
updated = false;
return currObj = stmt.tableDesc.readObject(buf);
}
internal Statement(Connection con, string sql, int stmtId)
{
this.stmtId = stmtId;
int src = 0, dst = 0, len = sql.Length;
int p = sql.IndexOf("from");
if (p < 0 && (p = sql.IndexOf("FROM")) < 0) {
throw new CliError("Bad statment: SELECT FROM expected");
}
p += 5;
while (p < len && sql[p] == ' ') {
p += 1;
}
int q = p;
while (++q < len && sql[q] != ' ');
if (p+1 == q) {
throw new CliError("Bad statment: table name expected after FROM");
}
string tableName = sql.Substring(p, q-p);
lock (Connection.tableHash) {
tableDesc = (TableDescriptor)Connection.tableHash[tableName];
if (tableDesc == null) {
Type tableClass = Type.GetType(tableName);
if (tableClass == null) {
if (con.pkgs != null)
{
foreach (string pkg in con.pkgs) {
tableClass = Type.GetType(pkg + '.' + tableName);
if (tableClass != null)
{
break;
}
}
}
if (tableClass == null)
{
foreach (Assembly ass in AppDomain.CurrentDomain.GetAssemblies())
{
foreach (Module mod in ass.GetModules())
{
foreach (Type t in mod.FindTypes(new TypeFilter(FindTypeByName), tableName))
{
if (tableClass != null)
{
throw new CliError("Class " + tableName + " exists in more than one scope");
}
tableClass = t;
}
}
}
}
if (tableClass == null) {
throw new CliError("Class " + tableName + " not found");
}
}
tableDesc = new TableDescriptor(tableClass);
Connection.tableHash[tableName] = tableDesc;
}
}
byte[] buf = new byte[len];
while (src < len) {
char ch = sql[src];
if (ch == '\'') {
do {
do {
buf[dst++] = (byte)sql[src++];
if (src == len) {
throw new CliError("Unterminated string constant in query");
}
} while (sql[src] != '\'');
buf[dst++] = (byte)'\'';
} while (++src < len && sql[src] == '\'');
} else if (ch == '%') {
int begin = src;
do {
if (++src == len) {
break;
}
ch = sql[src];
} while ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z')
|| (ch >= '0' && ch <= '9') || ch == '_');
if (ch == '%') {
throw new CliError("Invalid parameter name");
}
Parameter param = new Parameter(sql.Substring(begin, src-begin));
if (lastParam == null) {
parameters = param;
} else {
lastParam.next = param;
}
lastParam = param;
nParams += 1;
buf[dst++] = (byte)'\0';
} else {
buf[dst++]= (byte)sql[src++];
}
}
stmt = buf;
stmtLen = dst;
this.con = con;
}
/// <summary>
/// Close the statement. This method release all resource assoiated with statement
/// at client and server. f close method will not be called, cleanup still
/// will be performed later when garbage collector call finilize method of this
/// object
/// </summary>
///
public void close()
{
if (con == null) {
throw new CliError("Statement already closed");
}
ComBuffer buf = new ComBuffer(Connection.CLICommand.cli_cmd_free_statement, stmtId);
con.send(buf);
con = null;
}
internal ComBuffer(Connection.CLICommand cmd)
: this(cmd, 0)
{
}
