/** EXEC, EXECUTE and EXECUTE IMMEDIATE statement to execute dynamic SQL */
public Integer exec(HplsqlParser.Exec_stmtContext ctx) {
if (trace) {
trace(ctx, "EXECUTE");
}
Var vsql = evalPop(ctx.expr());
String sql = vsql.toString();
if (trace) {
trace(ctx, "Query: " + sql);
}
Query query = exec.executeSql(ctx, sql, exec.conf.defaultConnection);
if (query.error()) {
exec.signal(query);
return 1;
}
ResultSet rs = query.getResultSet();
if (rs != null) {
try {
ResultSetMetaData rsm = rs.getMetaData();
// Assign to variables
if (ctx.T_INTO() != null) {
int cols = ctx.L_ID().size();
if (rs.next()) {
for (int i = 0; i < cols; i++) {
Var var = exec.findVariable(ctx.L_ID(i).getText());
if (var != null) {
var.setValue(rs, rsm, i + 1);
if (trace) {
trace(
ctx,
"COLUMN: " + rsm.getColumnName(i + 1) + ", " + rsm.getColumnTypeName(i + 1));
trace(ctx, "SET " + var.getName() + " = " + var.toString());
}
} else if (trace) {
trace(ctx, "Variable not found: " + ctx.L_ID(i).getText());
}
}
exec.setSqlCode(0);
}
}
// Print the results
else {
int cols = rsm.getColumnCount();
while (rs.next()) {
for (int i = 1; i <= cols; i++) {
if (i > 1) {
System.out.print("\t");
}
System.out.print(rs.getString(i));
}
System.out.println("");
}
}
} catch (SQLException e) {
exec.setSqlCode(e);
}
}
exec.closeQuery(query, exec.conf.defaultConnection);
return 0;
}
@Override
public String toString() {
final TokenBuilder tb = new TokenBuilder().add(var.toString()).add(' ').add(ASSIGN);
tb.add(' ').add(expr.toString());
if (coll != null) tb.add(' ').add(COLLATION).add(" \"").add(coll.uri()).add('"');
return tb.toString();
}
/** FETCH cursor statement */
public Integer fetch(HplsqlParser.Fetch_stmtContext ctx) {
trace(ctx, "FETCH");
String name = ctx.L_ID(0).toString();
Var cursor = exec.findVariable(name);
if (cursor == null || cursor.type != Type.CURSOR) {
trace(ctx, "Cursor not found: " + name);
exec.setSqlCode(-1);
exec.signal(Signal.Type.SQLEXCEPTION);
return 1;
} else if (exec.getOffline()) {
exec.setSqlCode(100);
exec.signal(Signal.Type.NOTFOUND);
return 0;
}
// Assign values from the row to local variables
try {
Query query = (Query) cursor.value;
ResultSet rs = query.getResultSet();
ResultSetMetaData rsm = null;
if (rs != null) {
rsm = rs.getMetaData();
}
if (rs != null && rsm != null) {
int cols = ctx.L_ID().size() - 1;
if (rs.next()) {
for (int i = 1; i <= cols; i++) {
Var var = exec.findVariable(ctx.L_ID(i).getText());
if (var != null) {
var.setValue(rs, rsm, i);
if (trace) {
trace(ctx, "COLUMN: " + rsm.getColumnName(i) + ", " + rsm.getColumnTypeName(i));
trace(ctx, "SET " + var.getName() + " = " + var.toString());
}
} else if (trace) {
trace(ctx, "Variable not found: " + ctx.L_ID(i).getText());
}
}
exec.incRowCount();
exec.setSqlSuccess();
} else {
exec.setSqlCode(100);
exec.signal(Signal.Type.NOTFOUND);
}
}
} catch (SQLException e) {
exec.setSqlCode(e);
exec.signal(Signal.Type.SQLEXCEPTION, e.getMessage(), e);
}
return 0;
}
/** VALUES statement */
public Integer values(HplsqlParser.Values_into_stmtContext ctx) {
trace(ctx, "VALUES statement");
int cnt = ctx.ident().size(); // Number of variables and assignment expressions
int ecnt = ctx.expr().size();
for (int i = 0; i < cnt; i++) {
String name = ctx.ident(i).getText();
if (i < ecnt) {
visit(ctx.expr(i));
Var var = exec.setVariable(name);
if (trace) {
trace(ctx, "SET " + name + " = " + var.toString());
}
}
}
return 0;
}
/** Assignment from SELECT statement */
public Integer assignFromSelect(HplsqlParser.Assignment_stmt_select_itemContext ctx) {
String sql = evalPop(ctx.select_stmt()).toString();
if (trace) {
trace(ctx, sql.toString());
}
String conn = exec.getStatementConnection();
Query query = exec.executeQuery(ctx, sql.toString(), conn);
if (query.error()) {
exec.signal(query);
return 1;
}
exec.setSqlSuccess();
try {
ResultSet rs = query.getResultSet();
ResultSetMetaData rm = null;
if (rs != null) {
rm = rs.getMetaData();
int cnt = ctx.ident().size();
if (rs.next()) {
for (int i = 1; i <= cnt; i++) {
Var var = exec.findVariable(ctx.ident(i - 1).getText());
if (var != null) {
var.setValue(rs, rm, i);
if (trace) {
trace(ctx, "COLUMN: " + rm.getColumnName(i) + ", " + rm.getColumnTypeName(i));
trace(ctx, "SET " + var.getName() + " = " + var.toString());
}
} else if (trace) {
trace(ctx, "Variable not found: " + ctx.ident(i - 1).getText());
}
}
exec.incRowCount();
exec.setSqlSuccess();
} else {
exec.setSqlCode(100);
exec.signal(Signal.Type.NOTFOUND);
}
}
} catch (SQLException e) {
exec.signal(query);
return 1;
} finally {
exec.closeQuery(query, conn);
}
return 0;
}
/** String concatenation operator */
public void operatorConcat(HplsqlParser.Expr_concatContext ctx) {
StringBuilder val = new StringBuilder();
int cnt = ctx.expr_concat_item().size();
boolean nulls = true;
for (int i = 0; i < cnt; i++) {
Var c = evalPop(ctx.expr_concat_item(i));
if (!c.isNull()) {
val.append(c.toString());
nulls = false;
}
}
if (nulls) {
evalNull();
} else {
evalString(val);
}
}
public String toString() {
String r = "{\r\n";
if (this.lable != null) r = r + "lable in generated code";
r = r + "type:function\r\n";
r = r + "parameter:\r\n";
if (par != null) {
for (int i = 0; i < par.size(); i++) r += par.get(i).toString() + "\r\n";
}
if (rvalue != null) {
r += "return:\r\n";
r += rvalue.toString() + "\r\n";
}
if (table != null) {
r += "symbolTable:\r\n";
r += table.toString() + "\r\n";
}
String rr = "";
for (int i = 0; i < r.length(); i++) {
rr += r.charAt(i);
if (r.charAt(i) == '\n') rr += '\t';
}
rr += "\r\n}";
return rr;
}
/** Executing or building SELECT statement */
public Integer select(HplsqlParser.Select_stmtContext ctx) {
if (ctx.parent instanceof HplsqlParser.StmtContext) {
exec.stmtConnList.clear();
trace(ctx, "SELECT");
}
boolean oldBuildSql = exec.buildSql;
exec.buildSql = true;
StringBuilder sql = new StringBuilder();
if (ctx.cte_select_stmt() != null) {
sql.append(evalPop(ctx.cte_select_stmt()).toString());
sql.append("\n");
}
sql.append(evalPop(ctx.fullselect_stmt()).toString());
exec.buildSql = oldBuildSql;
if (!(ctx.parent instanceof HplsqlParser.StmtContext)) { // No need to execute at this stage
exec.stackPush(sql);
return 0;
}
if (trace && ctx.parent instanceof HplsqlParser.StmtContext) {
trace(ctx, sql.toString());
}
if (exec.getOffline()) {
trace(ctx, "Not executed - offline mode set");
return 0;
}
String conn = exec.getStatementConnection();
Query query = exec.executeQuery(ctx, sql.toString(), conn);
if (query.error()) {
exec.signal(query);
return 1;
}
trace(ctx, "SELECT completed successfully");
exec.setSqlSuccess();
try {
ResultSet rs = query.getResultSet();
ResultSetMetaData rm = null;
if (rs != null) {
rm = rs.getMetaData();
}
int into_cnt = getIntoCount(ctx);
if (into_cnt > 0) {
trace(ctx, "SELECT INTO statement executed");
if (rs.next()) {
for (int i = 1; i <= into_cnt; i++) {
String into_name = getIntoVariable(ctx, i - 1);
Var var = exec.findVariable(into_name);
if (var != null) {
var.setValue(rs, rm, i);
if (trace) {
trace(ctx, "COLUMN: " + rm.getColumnName(i) + ", " + rm.getColumnTypeName(i));
trace(ctx, "SET " + var.getName() + " = " + var.toString());
}
} else {
trace(ctx, "Variable not found: " + into_name);
}
}
exec.incRowCount();
exec.setSqlSuccess();
} else {
exec.setSqlCode(100);
exec.signal(Signal.Type.NOTFOUND);
}
}
// Print all results for standalone SELECT statement
else if (ctx.parent instanceof HplsqlParser.StmtContext) {
int cols = rm.getColumnCount();
if (trace) {
trace(ctx, "Standalone SELECT executed: " + cols + " columns in the result set");
}
while (rs.next()) {
for (int i = 1; i <= cols; i++) {
if (i > 1) {
System.out.print("\t");
}
System.out.print(rs.getString(i));
}
System.out.println("");
exec.incRowCount();
}
}
// Scalar subquery
else {
trace(ctx, "Scalar subquery executed, first row and first column fetched only");
if (rs.next()) {
exec.stackPush(new Var().setValue(rs, rm, 1));
exec.setSqlSuccess();
} else {
evalNull();
exec.setSqlCode(100);
}
}
} catch (SQLException e) {
exec.signal(query);
exec.closeQuery(query, exec.conf.defaultConnection);
return 1;
}
exec.closeQuery(query, exec.conf.defaultConnection);
return 0;
}