public String getPlanSQL() {
StatementBuilder buff = new StatementBuilder("MERGE INTO ");
buff.append(table.getSQL()).append('(');
for (Column c : columns) {
buff.appendExceptFirst(", ");
buff.append(c.getSQL());
}
buff.append(')');
if (keys != null) {
buff.append(" KEY(");
buff.resetCount();
for (Column c : keys) {
buff.appendExceptFirst(", ");
buff.append(c.getSQL());
}
buff.append(')');
}
buff.append('\n');
if (list.size() > 0) {
buff.append("VALUES ");
int row = 0;
for (Expression[] expr : list) {
if (row++ > 0) {
buff.append(", ");
}
buff.append('(');
buff.resetCount();
for (Expression e : expr) {
buff.appendExceptFirst(", ");
if (e == null) {
buff.append("DEFAULT");
} else {
buff.append(e.getSQL());
}
}
buff.append(')');
}
} else {
buff.append(query.getPlanSQL());
}
return buff.toString();
}
public void prepare() {
if (columns == null) {
if (list.size() > 0 && list.get(0).length == 0) {
// special case where table is used as a sequence
columns = new Column[0];
} else {
columns = table.getColumns();
}
}
if (list.size() > 0) {
for (Expression[] expr : list) {
if (expr.length != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
for (int i = 0; i < expr.length; i++) {
Expression e = expr[i];
if (e != null) {
expr[i] = e.optimize(session);
}
}
}
} else {
query.prepare();
if (query.getColumnCount() != columns.length) {
throw DbException.get(ErrorCode.COLUMN_COUNT_DOES_NOT_MATCH);
}
}
if (keys == null) {
Index idx = table.getPrimaryKey();
if (idx == null) {
throw DbException.get(ErrorCode.CONSTRAINT_NOT_FOUND_1, "PRIMARY KEY");
}
keys = idx.getColumns();
}
StatementBuilder buff = new StatementBuilder("UPDATE ");
buff.append(table.getSQL()).append(" SET ");
for (Column c : columns) {
buff.appendExceptFirst(", ");
buff.append(c.getSQL()).append("=?");
}
buff.append(" WHERE ");
buff.resetCount();
for (Column c : keys) {
buff.appendExceptFirst(" AND ");
buff.append(c.getSQL()).append("=?");
}
String sql = buff.toString();
update = session.prepare(sql);
}