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package database;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Allows a prepared statement to contain named parameters instead of a question
* mark position marker.
*
* @author Peter Wu
*/
public class NamedPreparedStatement {
private final List<String> fields;
private final PreparedStatement stmt;
public NamedPreparedStatement(Connection conn, String query) throws SQLException {
fields = new ArrayList<>();
Pattern pattern = Pattern.compile(":\\w+");
Matcher matcher = pattern.matcher(query);
while (matcher.find()) {
fields.add(matcher.group());
}
String sql = query.replaceAll(pattern.pattern(), "");
stmt = conn.prepareStatement(sql);
}
private List<Integer> getParamIndices(String fieldName) {
List<Integer> indices = new ArrayList<>();
int index = 0;
for (String name : fields) {
++index;
if (name.equals(fieldName)) {
indices.add(index);
}
}
if (indices.isEmpty()) {
throw new RuntimeException("Missing " + fieldName + " in query!");
}
return indices;
}
public void setLong(String name, long l) throws SQLException {
for (int paramIndex : getParamIndices(name)) {
stmt.setLong(paramIndex, l);
}
}
public void setString(String name, String str) throws SQLException {
for (int paramIndex : getParamIndices(name)) {
stmt.setString(paramIndex, str);
}
}
public void setString(String name, int i) throws SQLException {
for (int paramIndex : getParamIndices(name)) {
stmt.setInt(paramIndex, i);
}
}
public PreparedStatement getStmt() {
return stmt;
}
}
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