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Merged
magnusp merged 1 commit into from
Oct 23, 2026
Merged

feat(jdbc): read key and type metadata from SQLite pragmas #143

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108 changes: 108 additions & 0 deletions libsql-itests/src/test/java/com/github/magnusp/libsql/itest/DatabaseMetaDataIT.java
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package com.github.magnusp.libsql.itest;

import org.junit.jupiter.api.Test;

import java.sql.Connection;
import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import static org.assertj.core.api.Assertions.assertThat;

public class DatabaseMetaDataIT extends SqldContainerBase {

private String getDriverJdbcUrl() {
return "jdbc:libsql:" + getHttpUrl();
}

@Test
void keyAndTypeMetadataRoundTripThroughHrana() throws SQLException {
try (Connection conn = DriverManager.getConnection(getDriverJdbcUrl())) {
try (Statement s = conn.createStatement()) {
s.execute("CREATE TABLE meta_parent (id INTEGER, label TEXT, "
+ "CONSTRAINT pk_meta_parent PRIMARY KEY (id))");
s.execute("CREATE TABLE meta_child (id INTEGER, parent_id INTEGER, "
+ "CONSTRAINT fk_meta_child_parent FOREIGN KEY (parent_id) "
+ "REFERENCES meta_parent (id) ON DELETE CASCADE)");
}
DatabaseMetaData metadata = conn.getMetaData();

try (ResultSet rs = metadata.getPrimaryKeys(null, null, "meta_parent")) {
assertThat(rs.next()).isTrue();
assertThat(rs.getString("COLUMN_NAME")).isEqualTo("id");
assertThat(rs.getInt("KEY_SEQ")).isEqualTo(1);
assertThat(rs.getString("PK_NAME")).isEqualTo("pk_meta_parent");
assertThat(rs.next()).isFalse();
}

try (ResultSet rs = metadata.getImportedKeys(null, null, "meta_child")) {
assertThat(rs.next()).isTrue();
assertThat(rs.getString("PKTABLE_NAME")).isEqualTo("meta_parent");
assertThat(rs.getString("PKCOLUMN_NAME")).isEqualTo("id");
assertThat(rs.getString("FKTABLE_NAME")).isEqualTo("meta_child");
assertThat(rs.getString("FKCOLUMN_NAME")).isEqualTo("parent_id");
assertThat(rs.getInt("KEY_SEQ")).isEqualTo(1);
assertThat(rs.getInt("DELETE_RULE")).isEqualTo(DatabaseMetaData.importedKeyCascade);
assertThat(rs.getString("FK_NAME")).isEqualTo("fk_meta_child_parent");
assertThat(rs.getString("PK_NAME")).isEqualTo("pk_meta_parent");
assertThat(rs.next()).isFalse();
}

try (ResultSet rs = metadata.getExportedKeys(null, null, "meta_parent")) {
assertThat(rs.next()).isTrue();
assertThat(rs.getString("PKTABLE_NAME")).isEqualTo("meta_parent");
assertThat(rs.getString("FKTABLE_NAME")).isEqualTo("meta_child");
assertThat(rs.getString("FK_NAME")).isEqualTo("fk_meta_child_parent");
assertThat(rs.getString("PK_NAME")).isEqualTo("pk_meta_parent");
assertThat(rs.next()).isFalse();
}

try (ResultSet rs = metadata.getCrossReference(null, null, "meta_parent", null, null, "meta_child")) {
assertThat(rs.next()).isTrue();
assertThat(rs.getString("PKTABLE_NAME")).isEqualTo("meta_parent");
assertThat(rs.getString("FKTABLE_NAME")).isEqualTo("meta_child");
assertThat(rs.next()).isFalse();
}

try (ResultSet rs = metadata.getTypeInfo()) {
List<String> typeNames = new ArrayList<>();
while (rs.next()) {
typeNames.add(rs.getString("TYPE_NAME"));
}
assertThat(typeNames).containsExactly("NULL", "INTEGER", "REAL", "TEXT", "BLOB");
}
}
}

@Test
void keyMetadataWithoutForeignKeysIsEmptyAndWellFormed() throws SQLException {
try (Connection conn = DriverManager.getConnection(getDriverJdbcUrl())) {
try (Statement s = conn.createStatement()) {
s.execute("CREATE TABLE meta_plain (id INTEGER PRIMARY KEY, value TEXT)");
}
DatabaseMetaData metadata = conn.getMetaData();

try (ResultSet rs = metadata.getImportedKeys(null, null, "meta_plain")) {
assertThat(rs.getMetaData().getColumnCount()).isEqualTo(14);
assertThat(rs.next()).isFalse();
}
try (ResultSet rs = metadata.getExportedKeys(null, null, "meta_plain")) {
assertThat(rs.getMetaData().getColumnCount()).isEqualTo(14);
assertThat(rs.next()).isFalse();
}
try (ResultSet rs = metadata.getCrossReference(null, null, "meta_plain", null, null, "meta_plain")) {
assertThat(rs.getMetaData().getColumnCount()).isEqualTo(14);
assertThat(rs.next()).isFalse();
}
try (ResultSet rs = metadata.getPrimaryKeys(null, null, "meta_plain")) {
assertThat(rs.next()).isTrue();
assertThat(rs.getString("PK_NAME")).isNull();
assertThat(rs.next()).isFalse();
}
}
}
}
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