func (pgDbc PostgresDbConnection) UserExists(userName string, dbConn *baseDbConnection.DbConnection) (bool, error) {
queryResults, err := dbConn.Query("SELECT 1 FROM pg_roles WHERE rolname = '" + userName + "'")
if err != nil {
return false, err
}
users := baseDbConnection.ParseResults(queryResults)
for _ = range users {
return true, nil
}
return false, nil
}
func (pgDbc PostgresDbConnection) DbExists(databaseName string, dbConn *baseDbConnection.DbConnection) (bool, error) {
queryResults, err := dbConn.Query("SELECT 1 FROM pg_database WHERE datname = '" + databaseName + "'")
if err != nil {
return false, err
}
databases := baseDbConnection.ParseResults(queryResults)
for _ = range databases {
return true, nil
}
return false, nil
}
func (pgDbc PostgresDbConnection) GetTableDefinition(tableName string, dbConn *baseDbConnection.DbConnection) (baseDbConnection.TableDefinition, error) {
// In PostgreSQL, we query the system tables in information_schema to get the list
// of tables and their columns.
sqlGetTable := `
SELECT c.table_name, c.column_name, c.ordinal_position,
c.data_type, CASE WHEN primary_key = 1 THEN TRUE ELSE FALSE END AS primary_key,
c.column_default
FROM information_schema.columns c LEFT OUTER JOIN
(SELECT kcu.table_name, kcu.column_name, 1 AS primary_key
FROM information_schema.key_column_usage kcu INNER JOIN
information_schema.table_constraints tc ON
tc.table_catalog = kcu.table_catalog AND
tc.table_schema = kcu.table_schema AND
tc.table_name = kcu.table_name
WHERE tc.constraint_type = 'PRIMARY KEY') pk
ON pk.table_name = c.table_name AND
pk.column_name = c.column_name
WHERE c.table_catalog = '` + dbConn.DBName + `' AND
c.table_schema = '` + dbConn.Schema + `' AND c.table_name = '` + tableName + `'
ORDER BY c.table_name, c.ordinal_position, c.column_name`
tableDefinition := baseDbConnection.TableDefinition{}
tableDefinition.Columns = make([]baseDbConnection.ColumnDefinition, 0)
queryResults, err := dbConn.Query(sqlGetTable)
tableColumns := baseDbConnection.ParseResults(queryResults)
if err != nil {
return baseDbConnection.TableDefinition{}, err
}
for _, tableColumn := range tableColumns {
tableDefinition.Name = tableColumn["table_name"].(string)
newColumn :=
baseDbConnection.ColumnDefinition{
tableColumn["column_name"].(string),
tableColumn["data_type"].(string),
false,
tableColumn["column_default"].(string),
}
if tableColumn["primary_key"].(bool) {
newColumn.PrimaryKey = true
}
tableDefinition.Columns = append(tableDefinition.Columns, newColumn)
}
return tableDefinition, nil
}