/** DECLARE cursor statement */
public Integer declareCursor(HplsqlParser.Declare_cursor_itemContext ctx) {
String name = ctx.ident().getText();
if (trace) {
trace(ctx, "DECLARE CURSOR " + name);
}
Query query = new Query();
if (ctx.expr() != null) {
query.setExprCtx(ctx.expr());
} else if (ctx.select_stmt() != null) {
query.setSelectCtx(ctx.select_stmt());
}
exec.addVariable(new Var(name, Type.CURSOR, query));
return 0;
}
/** OPEN cursor statement */
public Integer open(HplsqlParser.Open_stmtContext ctx) {
trace(ctx, "OPEN");
Query query = null;
Var var = null;
String cursor = ctx.L_ID().toString();
String sql = null;
// Dynamic SQL
if (ctx.T_FOR() != null) {
sql = evalPop(ctx.expr()).toString();
if (trace) {
trace(ctx, cursor + ": " + sql);
}
query = new Query(sql);
var = new Var(cursor, Type.CURSOR, query);
exec.addVariable(var);
}
// Declared cursor
else {
var = exec.findVariable(cursor);
if (var != null && var.type == Type.CURSOR) {
query = (Query) var.value;
if (query.sqlExpr != null) {
sql = evalPop(query.sqlExpr).toString();
query.setSql(sql);
} else if (query.sqlSelect != null) {
sql = evalPop(query.sqlSelect).toString();
query.setSql(sql);
}
if (trace) {
trace(ctx, cursor + ": " + sql);
}
}
}
// Open cursor now
if (query != null) {
exec.executeQuery(ctx, query, exec.conf.defaultConnection);
if (query.error()) {
exec.signal(query);
return 1;
} else if (!exec.getOffline()) {
exec.setSqlCode(0);
}
} else {
trace(ctx, "Cursor not found: " + cursor);
exec.setSqlCode(-1);
exec.signal(Signal.Type.SQLEXCEPTION);
return 1;
}
return 0;
}
/** FOR cursor statement */
public Integer forCursor(HplsqlParser.For_cursor_stmtContext ctx) {
trace(ctx, "FOR CURSOR - ENTERED");
exec.enterScope(Scope.Type.LOOP);
String cursor = ctx.L_ID().getText();
String sql = evalPop(ctx.select_stmt()).toString();
trace(ctx, sql);
Query query = exec.executeQuery(ctx, sql, exec.conf.defaultConnection);
if (query.error()) {
exec.signal(query);
return 1;
}
trace(ctx, "SELECT completed successfully");
exec.setSqlSuccess();
try {
ResultSet rs = query.getResultSet();
if (rs != null) {
ResultSetMetaData rm = rs.getMetaData();
int cols = rm.getColumnCount();
Var[] vars = new Var[cols];
for (int i = 0; i < cols; i++) {
vars[i] = new Var();
vars[i].setName(cursor + "." + rm.getColumnName(i + 1));
vars[i].setType(rm.getColumnType(i + 1));
exec.addVariable(vars[i]);
if (trace) {
trace(ctx, "Column: " + vars[i].getName() + " " + rm.getColumnTypeName(i + 1));
}
}
while (rs.next()) {
for (int i = 0; i < cols; i++) {
vars[i].setValue(rs, rm, i + 1);
}
visit(ctx.block());
exec.incRowCount();
}
}
} catch (SQLException e) {
exec.signal(e);
exec.closeQuery(query, exec.conf.defaultConnection);
return 1;
}
exec.setSqlSuccess();
exec.closeQuery(query, exec.conf.defaultConnection);
exec.leaveScope();
trace(ctx, "FOR CURSOR - LEFT");
return 0;
}
/** FOR (integer range) statement */
public Integer forRange(HplsqlParser.For_range_stmtContext ctx) {
trace(ctx, "FOR RANGE - ENTERED");
int start = evalPop(ctx.expr(0)).intValue();
int end = evalPop(ctx.expr(1)).intValue();
int step = evalPop(ctx.expr(2), 1L).intValue();
exec.enterScope(Scope.Type.LOOP);
Var index = new Var(ctx.L_ID().getText(), new Long(start));
exec.addVariable(index);
if (ctx.T_REVERSE() == null) {
for (int i = start; i <= end; i += step) {
visit(ctx.block());
index.increment(new Long(step));
}
} else {
for (int i = start; i >= end; i -= step) {
visit(ctx.block());
index.decrement(new Long(step));
}
}
exec.leaveScope();
trace(ctx, "FOR RANGE - LEFT");
return 0;
}
