package liquibase.change.core;
import liquibase.change.AbstractChange;
import liquibase.change.DatabaseChange;
import liquibase.change.ChangeMetaData;
import liquibase.change.DatabaseChangeProperty;
import liquibase.database.Database;
import liquibase.structure.core.Table;
import liquibase.exception.DatabaseException;
import liquibase.exception.UnexpectedLiquibaseException;
import liquibase.executor.Executor;
import liquibase.executor.ExecutorService;
import liquibase.statement.SqlStatement;
import liquibase.statement.core.FindForeignKeyConstraintsStatement;
import liquibase.diff.compare.DatabaseObjectComparatorFactory;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
@DatabaseChange(name="dropAllForeignKeyConstraints", description = "Drops all foreign key constraints for a table", priority = ChangeMetaData.PRIORITY_DEFAULT, appliesTo = "table")
public class DropAllForeignKeyConstraintsChange extends AbstractChange {
private String baseTableCatalogName;
private String baseTableSchemaName;
private String baseTableName;
@DatabaseChangeProperty(mustEqualExisting ="table.catalog", description = "Name of the table containing columns constrained by foreign keys", since = "3.0")
public String getBaseTableCatalogName() {
return baseTableCatalogName;
}
public void setBaseTableCatalogName(String baseTableCatalogName) {
this.baseTableCatalogName = baseTableCatalogName;
}
@DatabaseChangeProperty(mustEqualExisting ="table.schema")
public String getBaseTableSchemaName() {
return baseTableSchemaName;
}
public void setBaseTableSchemaName(String baseTableSchemaName) {
this.baseTableSchemaName = baseTableSchemaName;
}
@DatabaseChangeProperty(mustEqualExisting = "table", requiredForDatabase = "all")
public String getBaseTableName() {
return baseTableName;
}
public void setBaseTableName(String baseTableName) {
this.baseTableName = baseTableName;
}
@Override
public SqlStatement[] generateStatements(Database database) {
List<SqlStatement> sqlStatements = new ArrayList<SqlStatement>();
List<DropForeignKeyConstraintChange> childDropChanges = generateChildren(database);
if (childDropChanges != null) {
for (DropForeignKeyConstraintChange change : childDropChanges) {
sqlStatements.addAll(Arrays.asList(change.generateStatements(database)));
}
}
return sqlStatements.toArray(new SqlStatement[sqlStatements.size()]);
}
@Override
public String getConfirmationMessage() {
return "Foreign keys on base table " + getBaseTableName() + " dropped";
}
private List<DropForeignKeyConstraintChange> generateChildren(Database database) {
// Make a new list
List<DropForeignKeyConstraintChange> childDropChanges = new ArrayList<DropForeignKeyConstraintChange>();
Executor executor = ExecutorService.getInstance().getExecutor(database);
FindForeignKeyConstraintsStatement sql = new FindForeignKeyConstraintsStatement(getBaseTableCatalogName(), getBaseTableSchemaName(), getBaseTableName());
try {
List<Map<String, ?>> results = executor.queryForList(sql);
Set<String> handledConstraints = new HashSet<String>();
if (results != null && results.size() > 0) {
for (Map result : results) {
String baseTableName =
(String) result.get(FindForeignKeyConstraintsStatement.RESULT_COLUMN_BASE_TABLE_NAME);
String constraintName =
(String) result.get(FindForeignKeyConstraintsStatement.RESULT_COLUMN_CONSTRAINT_NAME);
if (DatabaseObjectComparatorFactory.getInstance().isSameObject(new Table().setName(getBaseTableName()), new Table().setName(baseTableName), database)) {
if( !handledConstraints.contains(constraintName)) {
DropForeignKeyConstraintChange dropForeignKeyConstraintChange =
new DropForeignKeyConstraintChange();
dropForeignKeyConstraintChange.setBaseTableSchemaName(getBaseTableSchemaName());
dropForeignKeyConstraintChange.setBaseTableName(baseTableName);
dropForeignKeyConstraintChange.setConstraintName(constraintName);
childDropChanges.add(dropForeignKeyConstraintChange);
handledConstraints.add(constraintName);
}
} else {
throw new IllegalStateException("Expected to return only foreign keys for base table name: " +
getBaseTableName() + " and got results for table: " + baseTableName);
}
}
}
return childDropChanges;
} catch (DatabaseException e) {
throw new UnexpectedLiquibaseException("Failed to find foreign keys for table: " + getBaseTableName(), e);
}
}
@Override
public boolean generateStatementsVolatile(Database database) {
return true;
}
@Override
public String getSerializedObjectNamespace() {
return STANDARD_CHANGELOG_NAMESPACE;
}
}