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Merge pull request #131 from datafuselabs/feat/databend-parameter-met…
…adata Feat: impl databend parameter metadata
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89 changes: 89 additions & 0 deletions
89
databend-jdbc/src/main/java/com/databend/jdbc/DatabendParameterMetaData.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,89 @@ | ||
| package com.databend.jdbc; | ||
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| import java.sql.ParameterMetaData; | ||
| import java.sql.SQLException; | ||
| import java.sql.Types; | ||
| import java.util.List; | ||
| import java.util.Locale; | ||
| import java.util.Map; | ||
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| import static com.databend.jdbc.DatabendResultSetMetaData.getTypeClassName; | ||
| import static java.util.Objects.requireNonNull; | ||
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| public class DatabendParameterMetaData extends JdbcWrapper implements ParameterMetaData { | ||
| protected final List<DatabendColumnInfo> params; | ||
| protected final JdbcTypeMapping mapper; | ||
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| protected DatabendParameterMetaData(List<DatabendColumnInfo> params, JdbcTypeMapping mapper) { | ||
| this.params = requireNonNull(params, "connection is null"); | ||
| this.mapper = mapper; | ||
| } | ||
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| protected DatabendColumnInfo getParameter(int param) throws SQLException { | ||
| if (param < 1 || param > params.size()) { | ||
| throw new RuntimeException(format("Parameter index should between 1 and %d but we got %d", params.size(), param)); | ||
| } | ||
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| return params.get(param - 1); | ||
| } | ||
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| public static String format(String template, Object... args) { | ||
| return String.format(Locale.ROOT, template, args); | ||
| } | ||
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| @Override | ||
| public int getParameterCount() throws SQLException { | ||
| return params.size(); | ||
| } | ||
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| @Override | ||
| public int isNullable(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| if (p == null) { | ||
| return ParameterMetaData.parameterNullableUnknown; | ||
| } | ||
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| return p.getType().isNullable() ? ParameterMetaData.parameterNullable : ParameterMetaData.parameterNoNulls; | ||
| } | ||
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| @Override | ||
| public boolean isSigned(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| return p != null && p.isSigned(); | ||
| } | ||
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| @Override | ||
| public int getPrecision(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| return p != null ? p.getPrecision() : 0; | ||
| } | ||
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| @Override | ||
| public int getScale(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| return p != null ? p.getScale() : 0; | ||
| } | ||
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| @Override | ||
| public int getParameterType(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| return p != null ? mapper.toSqlType(p) : Types.OTHER; | ||
| } | ||
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| @Override | ||
| public String getParameterTypeName(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| return p != null ? p.getColumnTypeName() : "<unknown>"; | ||
| } | ||
|
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| @Override | ||
| public String getParameterClassName(int param) throws SQLException { | ||
| DatabendColumnInfo p = getParameter(param); | ||
| return getTypeClassName(p.getColumnType()); | ||
| } | ||
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| @Override | ||
| public int getParameterMode(int param) throws SQLException { | ||
| return ParameterMetaData.parameterModeIn; | ||
| } | ||
| } |
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